feat: add HLS cache toggle and cache management to Settings

Chromium's HTTP disk cache accumulates HLS segments indefinitely on
Steam Deck — single-use segments have ~0% cache-hit rate but cause
unbounded SSD writes and disk growth. This wires up a runtime toggle
(default: cache disabled) so the user can control the behaviour without
restarting the app.

- Introduce src/main/prefs/hlsCachePref.ts as a shared mutable so
  index.ts and handlers.ts don't form a circular import
- Restructure onHeadersReceived in setupTwitchCors: CORS-bypass and
  no-store now run as independent blocks; no-store fires only for HLS
  extensions (.m3u8/.ts/.m4s/.aac, path before ?) when the toggle is off
- Add IPC handlers app:get-cache-size, app:clear-cache,
  app:set-hls-cache-enabled; wire through preload bridge and t4sd.d.ts
- Extend SettingsContext with hlsCacheEnabled (default false); push
  persisted value to main on mount and on every change
- Add "Speicher" section to SettingsScreen with HLS toggle row and
  cache-size display + clear button; gamepad-navigable

CLAUDE.md

@@ -1,6 +1,6 @@
 # Twitch4SteamDeck — CLAUDE.md
 
-Ad-freier Twitch-Client für das Steam Deck. Electron + React, gamepad-navigierbar, Big-Screen-UI (auf Linux/Steam Deck: Fenster maximiert auf Primärdisplay; im Windows-Dev: 1280x800). Unterstützt Live-Streams und VODs mit Resume und Kapitelwahl. Deployment als Flatpak auf dem Steam Deck.
+Twitch-Client für das Steam Deck. Electron + React, gamepad-navigierbar, Big-Screen-UI (auf Linux/Steam Deck: Fenster maximiert auf Primärdisplay; im Windows-Dev: 1280x800). Unterstützt Live-Streams und VODs mit Resume und Kapitelwahl. Deployment als Flatpak auf dem Steam Deck.
 
 ---
 
@@ -10,6 +10,7 @@ Ad-freier Twitch-Client für das Steam Deck. Electron + React, gamepad-navigierb
 |---|---|
 | Framework | Electron 33, electron-vite, React 18, TypeScript 5.5 |
 | Playback | hls.js 1.6 (HTML5 `<video>` im Renderer), Streamlink 6.11.0 im Flatpak-Build / 8.2.1 im Windows-Dev (nur für `--stream-url`) |
+| Gamepad (Linux) | evdev `/dev/input/event*` mit BTN_*-Codes (Xbox, PlayStation, Nintendo; USB + Bluetooth) |
 | DB | better-sqlite3 (VOD-Verlauf + Resume-Positionen) |
 | Packaging | Flatpak (freedesktop SDK 24.08, Electron2 BaseApp) |
 | Build-Host | Windows, Flatpak-Build läuft in WSL2 |
@@ -24,9 +25,9 @@ Electron Main Process
 ├── AuthService          — Twitch Device Code Flow, Token-Verwaltung (safeStorage)
 ├── HelixClient          — Twitch Helix REST API + GQL (Kapitel)
 ├── PlaybackService      — Live-/VOD-Orchestrierung
-│   └── streamlink.ts    — getStreamUrl() via streamlink --stream-url
+│   └── streamlink.ts    — getStreamUrl() + getAvailableQualities() via streamlink
 ├── historyRepo          — SQLite VOD-Verlauf (Resume, Completed)
-└── gamepadReader        — Linux /dev/input/js* Joystick-Leser
+└── gamepadReader        — Linux evdev /dev/input/event* (via js*-Discovery, BTN_*-Codes)
 
 Preload (contextBridge)
 └── window.t4sd          — Typisierte IPC-Bridge (auth, twitch, history, playback, gamepad)
@@ -52,8 +53,10 @@ Renderer (React)
 - **VOD-Playback:** ChannelScreen → IPC `playback:start-vod` → PlaybackService → `streamlink --stream-url twitch.tv/videos/<id>` → HLS-URL → IPC-Event `playback:hls-url` → Renderer → `VideoPlayer` (hls.js, seekTo startPosition)
 - **Overlay:** `PlaybackOverlay` (z-index: 300) liegt als normales DOM-Element über `VideoPlayer` (z-index: 100) — kein Fenster-Layering nötig
 - **Seek/Pause/Stop:** direkt über `videoRef.current` (kein IPC-Roundtrip)
+- **Qualitätswechsel:** `videoRef.current.stop()` → `startLive/startVod(quality)` → neuer `playback:hls-url` Event — streamlink-Neustart nötig, da Single-Bitrate-HLS (kein hls.js Level-Switch möglich)
+- **Qualitätsliste:** `IPC playback:get-qualities` → `streamlink --json <url>` → `Object.keys(streams)` sortiert nach fixem Order-Array
 - **Position-Tracking:** `VideoPlayer` meldet alle 5s via IPC `playback:report-position` → Main → SQLite
-- **Gamepad:** `/dev/input/js*` (Linux/Gaming-Mode) **oder** `navigator.getGamepads()` (Windows/Dev) → synthetische `KeyboardEvent`s → alle Screen-Handler reagieren auf Keys
+- **Gamepad:** evdev `/dev/input/event*` via js*-Discovery (Linux/Gaming-Mode) **oder** `navigator.getGamepads()` (Windows/Dev) → synthetische `KeyboardEvent`s → alle Screen-Handler reagieren auf Keys
 
 ---
 
@@ -96,12 +99,12 @@ src/main/
     deviceCodeFlow.ts         — OAuth Device Code + Polling (https://id.twitch.tv/oauth2/)
     tokenStore.ts             — safeStorage-Verschlüsselung, Fallback auf plaintext
   input/
-    gamepadReader.ts          — /dev/input/js* Leser, Hotplug (3s-Scan), Deduplizierung (40ms)
+    gamepadReader.ts          — evdev /dev/input/event* Leser (via js*-Discovery), Hotplug (3s-Scan), Deduplizierung (40ms); BTN_*-Codes für controller-unabhängiges Mapping
   ipc/
     handlers.ts               — Alle ipcMain.handle()-Registrierungen + Event-Forwarding
   playback/
-    playbackService.ts        — Orchestrator: streamlink --stream-url → HLS-URL → playback-hls-url Event
-    streamlink.ts             — getStreamUrl() via streamlink --stream-url (Prozess-Spawning, URL-Extraktion: letzte https://-Zeile)
+    playbackService.ts        — Orchestrator: streamlink --stream-url → HLS-URL → playback-hls-url Event; startVod(quality?); getAvailableQualities()
+    streamlink.ts             — getStreamUrl() + getAvailableQualities() via streamlink (--stream-url für URL, --json für Qualitätsliste)
     types.ts                  — Quality-Typ, PlaybackEvent, HlsUrlPayload
   store/
     db.ts                     — SQLite-Init, WAL-Modus, Migration (vod_history-Tabelle)
@@ -120,18 +123,18 @@ src/renderer/src/
   App.tsx                     — Auth-Gate, Gamepad-Init
   main.tsx                    — React-DOM-Bootstrap, SettingsProvider
   screens/
-    AppShell.tsx              — Tab-Routing, Sidebar/Main-Fokus-Split, Globaler Playback-Overlay (direkter Stream-Start ohne ChannelScreen)
+    AppShell.tsx              — Tab-Routing, Sidebar/Main-Fokus-Split, Globaler Playback-Overlay (direkter Stream-Start ohne ChannelScreen), Qualitätswahl für Live
     LoginScreen.tsx           — Device-Code-Login, QR-Code, Countdown
     FollowingScreen.tsx       — Gefolgte Kanäle (Grid), Live/Offline-Sort
     BrowseScreen.tsx          — Top-Streams-Shelf (A=Direkt-Play, X=Kanalseite) + Kategorien-Grid (Infinite Scroll)
     CategoryScreen.tsx        — Streams einer Kategorie (A=Direkt-Play, X=Kanalseite)
-    ChannelScreen.tsx         — Channel-Detail, VOD-Shelf, VideoPlayer + PlaybackOverlay, Kapitel-Panel
+    ChannelScreen.tsx         — Channel-Detail, VOD-Shelf, VideoPlayer + PlaybackOverlay, Kapitel-Panel, Qualitätswahl
     StreamListScreen.tsx      — Sprachgefilterte Stream-Liste DE/EN (A=Direkt-Play, X=Kanalseite)
     SettingsScreen.tsx        — streamBadgeMode, sidebarWidth, badgeGap
     AccountScreen.tsx         — Nutzerinfo, Logout
   components/
     VideoPlayer.tsx           — hls.js <video> Wrapper, forwardRef (seek, seekTo, pause, play, stop, getCurrentTime); attachMedia vor loadSource; play() in MANIFEST_PARSED
-    PlaybackOverlay.tsx       — DOM-Overlay (Seek-Bar, Kanalinfo, Gamepad-Hints, Auto-Hide); playState: 'playing'|'paused'
+    PlaybackOverlay.tsx       — DOM-Overlay (Seek-Bar, Kanalinfo, Gamepad-Hints, Auto-Hide, Qualitäts-Button + Panel); playState: 'playing'|'paused'
     FocusableCard.tsx         — Wiederverwendbare Kanal-Karte (Thumbnail, Badge, Progress)
     Sidebar.tsx               — Navigationssidebar (6 Tabs)
     LanguageBadge.tsx         — Sprach-/Flagge-Badge
@@ -202,14 +205,24 @@ Video läuft als HTML5 `<video>` Element innerhalb des Electron-Fensters — **k
 
 **Warum dieser Ansatz:** Früherer Ansatz mit externem mpv-Fullscreen-Fenster wurde vom OS-Windowmanager (Gamescope auf Steam Deck) immer über das Electron-Fenster gelegt. CSS `z-index` wirkt nur innerhalb eines Dokuments, nicht auf OS-Fensterebene. Die Lösung: Video und Overlay im selben Rendering-Kontext halten.
 
+### Qualitätswahl während Wiedergabe
+- **Qualitätswechsel = streamlink-Neustart**: streamlink liefert Single-Bitrate-HLS → hls.js-Level-Switch nicht nutzbar. Wechsel: `videoRef.stop()` → `startLive/startVod(quality)` → neuer `hls-url` Event.
+- **VOD mit Resume**: `getCurrentTime()` vor Stop → als `startSeconds` an neues `startVod()`.
+- **Qualitätsliste**: asynchron nach Stream-Start via `playback:get-qualities` IPC → `streamlink --json <url>` → `Object.keys(json.streams)`, sortiert: `['best', '1080p60', '720p60', '480p', '360p', '160p', 'audio_only', 'worst']`
+- **Session-only**: kein Persistieren in Settings/localStorage.
+- **Panel-State im Parent**: `qualityPanelOpen`, `qualityFocusedIndex` in ChannelScreen/AppShell — PlaybackOverlay bekommt Props + Callbacks.
+- **Key-Handler Priorität**: `qualityPanelOpen`-Block wird VOR allen anderen Keys geprüft und gibt `return` — verhindert Seek/Pause-Konflikte während das Panel offen ist.
+- **X-Taste** öffnet Quality-Panel (Gamepad Button X → `x`-KeyboardEvent).
+
 ### Kapitel-Panel during Playback
-Wenn der User während der Wiedergabe das Kapitel-Panel öffnet (Y-Taste), wird das Video **pausiert** (nicht gestoppt). Nach Kapitelwahl: `seekTo(chapter.positionSeconds)` + `play()`. Nach Schließen ohne Auswahl: `play()` (falls vorher playing).
+Wenn der User während der Wiedergabe das Kapitel-Panel öffnet (Y-Taste), läuft das Video **weiter** (nicht pausiert). `PlaybackOverlay` wird per conditional render (`!chapterPanelVod`) ausgeblendet, sodass das Kapitel-Panel sauber über dem Video erscheint. Nach Kapitelwahl: `seekTo(chapter.positionSeconds)` — kein `play()` nötig, da Video bereits läuft. Nach Schließen ohne Auswahl: Panel weg, Video läuft unverändert weiter. Bei leerer Kapitelliste: X-Taste seeked zu `0` (Videoanfang).
 
 ### Gamepad Dual-Path
-- **Linux/Gaming-Mode:** `src/main/input/gamepadReader.ts` liest `/dev/input/js*` direkt (Chromium Gamepad API funktioniert nicht im Flatpak-Sandbox ohne udev)
+- **Linux/Gaming-Mode:** `src/main/input/gamepadReader.ts` nutzt Linux evdev (`/dev/input/event*`). Erkennung läuft über `/dev/input/js*`-Scan; für jedes js*-Device wird via `/sys/class/input/jsN` das zugehörige `event*`-Device ermittelt und geöffnet. Dadurch werden standardisierte `BTN_*`-Codes gelesen (BTN_NORTH=X, BTN_SOUTH=A usw.) — funktioniert treiber- und controller-unabhängig für Xbox, PlayStation, Nintendo und beliebige USB/Bluetooth-Gamepads.
 - **Windows/Dev:** `src/renderer/src/input/gamepad.ts` nutzt `navigator.getGamepads()` via rAF-Loop
 - Beide Pfade erzeugen synthetische `KeyboardEvent('keydown')`. Alle UI-Komponenten reagieren nur auf Key-Events — kein Gamepad-Code in Screens.
 - Button-Mapping: A=Enter, B=Escape, X=x, Y=y, LB=l1, RB=r1, LT=l2, RT=r2, DPad=Arrows
+- Fallback: Falls `/sys`-Lookup fehlschlägt, öffnet `JoystickFallbackReader` das js*-Device direkt (altes Joystick-API mit festem Button-Nummern-Mapping)
 
 ### A-Button-Verhalten je Screen
 | Screen | A-Button | X-Button |
@@ -221,8 +234,9 @@ Wenn der User während der Wiedergabe das Kapitel-Panel öffnet (Y-Taste), wird
 | ChannelScreen | Live-Stream starten / Bestätigen | — |
 
 ### VOD vs. Live Playback
-- **Live:** `streamlink --stream-url twitch.tv/<login> best` → HLS-URL → hls.js spielt Live-Playlist nativ
-- **VOD:** `streamlink --stream-url twitch.tv/videos/<id> best` → HLS-URL → hls.js seeked zu `startPosition` via `video.currentTime`
+- **Live:** `streamlink --stream-url twitch.tv/<login> <quality>` → HLS-URL → hls.js spielt Live-Playlist nativ
+- **VOD:** `streamlink --stream-url twitch.tv/videos/<id> <quality>` → HLS-URL → hls.js seeked zu `startPosition` via `video.currentTime`
+- **Quality-Default:** `'best'` — kein Persistieren, nur Session-State
 - **Resume:** `history.getPosition(vodId)` im Main-Prozess → als `startPosition` im `playback:hls-url` Event → `VideoPlayer` seeked nach MANIFEST_PARSED
 
 ### Position-Tracking
@@ -245,12 +259,12 @@ Wenn der User während der Wiedergabe das Kapitel-Panel öffnet (Y-Taste), wird
 
 | Problem | Status | Details |
 |---|---|---|
-| hls.js Performance auf Steam Deck | Ungetestet | Chromiums VA-API Hardware-Decode sollte ausreichen. Falls Dropped Frames bei 1080p60 → Qualität auf 720p reduzieren oder mpv-Fallback evaluieren. |
+| hls.js Performance auf Steam Deck | Ungetestet | Chromiums VA-API Hardware-Decode sollte ausreichen. Falls Dropped Frames bei 1080p60 → Qualitäts-Button im Overlay nutzen (720p60 wählen) oder mpv-Fallback evaluieren. |
 | Twitch Live-Stream URL-Expiry | Unkritisch | `streamlink --stream-url` Token in URL kann ablaufen. hls.js handelt Playlist-Refresh automatisch; bei Verbindungsabbruch muss neu gestartet werden. |
 | Ad-Bypass | Nicht implementiert | `--twitch-disable-ads` von Streamlink deprecated. Post-MVP. |
 | Flaggen-Emojis auf Windows | Nur Rechtecke | Unicode Regional Indicators brauchen Noto Color Emoji (Linux). Im Dev-Mode ignorieren. |
-| Browser Gamepad API in Gaming Mode | Nicht nutzbar | Steam Input + Flatpak-Sandbox blockiert udev-Events für Chromium. Deshalb `/dev/input/js*` direkt. |
-| Bluetooth-Controller-Deduplizierung | Aktiv | Mehrere `/dev/input/js*`-Devices melden gleiche Inputs → 40ms-Deduplizierungsfenster in `gamepadReader.ts` |
+| Browser Gamepad API in Gaming Mode | Nicht nutzbar | Steam Input + Flatpak-Sandbox blockiert udev-Events für Chromium. Deshalb evdev direkt im Main-Process. |
+| Bluetooth-Controller-Deduplizierung | Aktiv | Mehrere `/dev/input/js*`-Devices (z.B. Raw-Device + Steam-Virtual-Device) → 40ms-Deduplizierungsfenster in `gamepadReader.ts` |
 | Flatpak-Manifest mpv-Einträge | Noch nicht bereinigt | `tv.twitch4steamdeck.App.yml` enthält noch mpv-Build-Schritte und den mpv-Patch — nach Steam Deck Test entfernen. |
 | Direkt-Start: kein VOD-Support | By Design | AppShell-Overlay nur für Live-Streams. VODs nur über Kanalseite (ChannelScreen) mit Resume + Kapitel. |
 
@@ -296,9 +310,10 @@ Beim Start erscheinen diese Logs (alle mit `[VideoPlayer]`-Prefix):
 2. hls.js seeked in `MANIFEST_PARSED`-Handler: `video.currentTime = startPosition`
 
 ### Gamepad-Eingaben kommen nicht an (Steam Deck)
-1. `gamepadReader.ts` liest `/dev/input/js*` — prüfen ob Device vorhanden
-2. Deduplizierungs-Fenster: 40ms — bei Doppel-Inputs erhöhen
-3. Axis-Mapping: DPad ist Axis 6/7 (binary), Stick ist 0/1 (threshold 16384)
+1. `gamepadReader.ts` scannt `/dev/input/js*` — prüfen ob js-Device vorhanden (`ls /dev/input/js*`)
+2. Für jedes js-Device wird via `/sys/class/input/jsN` ein evdev-Device (`event*`) gesucht — Log `[gamepad] geöffnet (evdev): /dev/input/js0 → /dev/input/event4` zeigt ob das funktioniert
+3. Deduplizierungs-Fenster: 40ms — bei Doppel-Inputs `DUPLICATE_EVENT_WINDOW_MS` erhöhen
+4. Axis-Mapping: DPad ist ABS_HAT0X/Y (code 16/17), Stick ist ABS_X/Y (code 0/1, threshold 16384)
 
 ### IPC-Channel fehlt / unbekannt
 Prüfen: `handlers.ts` (Main), `preload/index.ts` (Bridge), `t4sd.d.ts` (Renderer-Typen) — alle drei müssen übereinstimmen.

README.md

@@ -5,15 +5,32 @@
 <a name="english"></a>
 # Twitch4SteamDeck
 
-Ad-free Twitch client for the Steam Deck with Big-Screen UI, full gamepad control, and VOD playback with resume.
+> **Disclaimer:** This app was vibe coded with Claude Code— architecture and structure were planned together with AI, and all implementation was done through prompts. Not a single line was written by hand.
+
+Twitch client for the Steam Deck with Big-Screen UI, full gamepad control, and VOD playback with resume.
+
+## Screenshots
+
+<p align="center">
+  <img src="screenshots/browse.jpg" width="49%" alt="Browse screen" />
+  <img src="screenshots/follow.jpg" width="49%" alt="Following screen" />
+</p>
+<p align="center">
+  <img src="screenshots/channelscreen.jpg" width="49%" alt="Channel screen" />
+  <img src="screenshots/player_overlay.jpg" width="49%" alt="Playback overlay" />
+</p>
+<p align="center">
+  <img src="screenshots/chapter.jpg" width="49%" alt="Chapter panel" />
+</p>
 
 ## Features
 
 - **Live Streams** — Ad-free playback via Streamlink + hls.js (HTML5 video, no external player)
 - **VOD Playback** — Watch recordings with automatic resume at last position
-- **VOD Chapters** — Browse and jump to chapters within VODs
+- **VOD Chapters** — Browse and jump to chapters within VODs; view count displayed on VOD cards
+- **Video Quality Selection** — Change stream quality on-the-fly during playback (Live and VOD); available qualities fetched dynamically via Streamlink; session-only, defaults to `best`
 - **Direct Stream Start** — Press A on any stream card in Browse/Top Streams/Category to start immediately without leaving the browse view
-- **Gamepad Control** — Full control via Steam Deck controller or Xbox gamepad, including Gaming Mode (reads `/dev/input/js*` directly, bypasses Chromium sandbox limitations)
+- **Gamepad Control** — Full control via Steam Deck controller, Xbox, or PlayStation gamepad (USB and Bluetooth), including Gaming Mode (reads Linux evdev `/dev/input/event*` directly with standardized BTN_* codes — works with any controller regardless of driver)
 - **Big-Screen UI** — 10-foot interface optimized for TV/deck; fills the screen on Steam Deck and on external TVs when docked (React + Electron)
 - **Twitch Login** — Device Code Flow with QR code (no browser required)
 - **Following** — Live status and overview of followed streamers
@@ -31,7 +48,7 @@ Electron (Main Process)
   ├── Auth          -- Twitch Device Code Flow + token management (Electron safeStorage)
   ├── Helix Client  -- Twitch API (followed channels, streams, VODs, categories, chapters via GQL)
   ├── Playback      -- Streamlink --stream-url → HLS URL → IPC event to renderer
-  ├── Gamepad       -- Linux joystick API (/dev/input/js*)
+  ├── Gamepad       -- Linux evdev (/dev/input/event*), discovered via js*, BTN_* codes
   └── History       -- SQLite (better-sqlite3) for VOD history + resume
 
 Electron (Renderer)
@@ -137,6 +154,8 @@ The script handles automatically:
 | A | Following | Open channel page |
 | A | Channel page | Play live stream / confirm |
 | A | During playback | Pause / Resume |
+| X | During playback | Open quality selection panel |
+| Y | During playback (VOD) | Open chapter menu |
 | B | During playback | Stop |
 | ← / → (D-Pad) | During playback | Seek ±30s |
 | LT / RT | During playback (VOD) | Seek ±5min |
@@ -161,7 +180,7 @@ The script handles automatically:
 | Video | hls.js 1.6 (HTML5 `<video>` in Renderer) |
 | Stream URL | Streamlink 8.2.1 (Windows dev) / 6.11.0 (Flatpak) via `--stream-url` |
 | Database | better-sqlite3 |
-| Gamepad | Linux joystick API (`/dev/input/js*`) |
+| Gamepad | Linux evdev (`/dev/input/event*`), Xbox / PS / any BT or USB controller |
 | Packaging | Flatpak / electron-builder (AppImage) |
 | HW Decoding | Chromium VA-API (automatic on Steam Deck) |
 
@@ -172,15 +191,18 @@ The script handles automatically:
 <a name="deutsch"></a>
 # Twitch4SteamDeck
 
-Werbefreier Twitch-Client fuer das Steam Deck mit Big-Screen-UI, voller Gamepad-Steuerung und VOD-Wiedergabe mit Resume.
+> **Hinweis:** Diese App wurde mit Claude vibe coded — Architektur und Struktur wurden gemeinsam mit KI geplant, die gesamte Implementierung erfolgte per Prompt. Keine einzige Zeile wurde von Hand geschrieben.
+
+ Twitch-Client fuer das Steam Deck mit Big-Screen-UI, voller Gamepad-Steuerung und VOD-Wiedergabe mit Resume.
 
 ## Features
 
-- **Live-Streams** — Werbefreie Wiedergabe ueber Streamlink + hls.js (HTML5-Video, kein externer Player)
+- **Live-Streams** — Wiedergabe ueber Streamlink + hls.js (HTML5-Video, kein externer Player)
 - **VOD-Wiedergabe** — Aufnahmen ansehen mit automatischem Resume an der letzten Position
-- **VOD-Kapitel** — Kapitel in VODs durchsuchen und direkt anspringen
+- **VOD-Kapitel** — Kapitel in VODs durchsuchen und direkt anspringen; Aufrufzahl auf VOD-Karten
+- **Video-Qualitaetswahl** — Stream-Qualitaet waehrend der Wiedergabe aendern (Live und VOD); verfuegbare Qualitaeten werden dynamisch ueber Streamlink ermittelt; nur Session-State, Standard ist `best`
 - **Direkter Stream-Start** — A-Button auf einer Stream-Karte in Durchsuchen/Top-Streams/Kategorie startet den Stream sofort als Vollbild-Overlay, ohne die Browse-Ansicht zu verlassen
-- **Gamepad-Steuerung** — Volle Bedienung per Steam Deck Controller oder Xbox-Gamepad, auch im Gaming Mode (liest `/dev/input/js*` direkt, umgeht Chromium-Sandbox-Limitierungen)
+- **Gamepad-Steuerung** — Volle Bedienung per Steam Deck Controller, Xbox- oder PlayStation-Gamepad (USB und Bluetooth), auch im Gaming Mode (liest Linux evdev `/dev/input/event*` direkt mit standardisierten BTN_*-Codes — funktioniert mit jedem Controller unabhängig vom Treiber)
 - **Big-Screen-UI** — 10-Foot-Interface optimiert fuer TV/Deck; bildschirmfuellend auf dem Steam Deck und auf externen TVs im Docking-Betrieb (React + Electron)
 - **Twitch-Login** — Device Code Flow mit QR-Code (kein Browser noetig)
 - **Gefolgte Kanaele** — Live-Status und Uebersicht der gefolgten Streamer
@@ -198,7 +220,7 @@ Electron (Main Process)
   ├── Auth          -- Twitch Device Code Flow + Token-Verwaltung (Electron safeStorage)
   ├── Helix Client  -- Twitch API (gefolgte Kanaele, Streams, VODs, Kategorien, Kapitel via GQL)
   ├── Playback      -- Streamlink --stream-url → HLS-URL → IPC-Event an Renderer
-  ├── Gamepad       -- Linux joystick API (/dev/input/js*)
+  ├── Gamepad       -- Linux evdev (/dev/input/event*), via js* erkannt, BTN_*-Codes
   └── History       -- SQLite (better-sqlite3) fuer VOD-Verlauf + Resume
 
 Electron (Renderer)
@@ -304,6 +326,8 @@ Das Script erledigt automatisch:
 | A | Du folgst | Kanalseite oeffnen |
 | A | Kanalseite | Live-Stream starten / Bestaetigen |
 | A | Waehrend Wiedergabe | Pause / Fortsetzen |
+| X | Waehrend Wiedergabe | Qualitaetspanel oeffnen |
+| Y | Waehrend Wiedergabe (VOD) | Kapitelmenü oeffnen |
 | B | Waehrend Wiedergabe | Stop |
 | ← / → (D-Pad) | Waehrend Wiedergabe | ±30s springen |
 | LT / RT | Waehrend Wiedergabe (VOD) | ±5min springen |
@@ -328,7 +352,7 @@ Das Script erledigt automatisch:
 | Video | hls.js 1.6 (HTML5 `<video>` im Renderer) |
 | Stream-URL | Streamlink 8.2.1 (Windows-Dev) / 6.11.0 (Flatpak) via `--stream-url` |
 | Datenbank | better-sqlite3 |
-| Gamepad | Linux joystick API (`/dev/input/js*`) |
+| Gamepad | Linux evdev (`/dev/input/event*`), Xbox / PS / beliebiger BT- oder USB-Controller |
 | Packaging | Flatpak / electron-builder (AppImage) |
 | HW-Decoding | Chromium VA-API (automatisch auf Steam Deck) |
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "twitch4steamdeck",
-  "version": "0.4.1",
+  "version": "0.4.5",
   "description": "Twitch-Client für das Steam Deck (Live & VOD, Big-Screen-UI)",
   "main": "out/main/index.js",
   "author": "twitch4steamdeck",

src/main/index.ts

@@ -5,6 +5,7 @@ import { HelixClient } from './twitch/helixClient'
 import { PlaybackService } from './playback/playbackService'
 import { registerIpcHandlers } from './ipc/handlers'
 import { startGamepadReader } from './input/gamepadReader'
+import { getHlsCacheEnabled } from './prefs/hlsCachePref'
 
 const isDev = !app.isPackaged
 
@@ -53,11 +54,18 @@ function createWindow(): BrowserWindow {
   return win
 }
 
+function isHlsStreamContent(url: string): boolean {
+  const pathEnd = url.indexOf('?')
+  const path = pathEnd === -1 ? url : url.slice(0, pathEnd)
+  return /\.(m3u8|ts|m4s|aac)$/i.test(path)
+}
+
 /**
  * CORS-Bypass für Twitch CDN und HLS-Streams.
  * hls.js im Renderer sendet Requests von localhost/file:// — Twitch CDN erwartet
  * Origin: https://www.twitch.tv. Wir setzen Origin + Referer auf ausgehenden Requests
  * und ergänzen CORS-Response-Header, damit Chromium die Antworten akzeptiert.
+ * Zusätzlich: cache-control: no-store für HLS-Inhalte wenn hlsCacheEnabled=false.
  */
 function setupTwitchCors(): void {
   const isTwitchCdn = (url: string): boolean =>
@@ -75,18 +83,24 @@ function setupTwitchCors(): void {
   })
 
   session.defaultSession.webRequest.onHeadersReceived((details, callback) => {
-    if (isTwitchCdn(details.url)) {
+    const isCdn = isTwitchCdn(details.url)
+    const applyNoStore = isHlsStreamContent(details.url) && !getHlsCacheEnabled()
+
+    if (!isCdn && !applyNoStore) { callback({}); return }
+
     const headers: Record<string, string[]> = {}
     for (const [k, v] of Object.entries(details.responseHeaders ?? {})) {
       headers[k.toLowerCase()] = Array.isArray(v) ? v : [v]
     }
+    if (isCdn) {
       headers['access-control-allow-origin'] = ['*']
       headers['access-control-allow-headers'] = ['*']
       headers['access-control-allow-methods'] = ['GET, HEAD, OPTIONS']
-      callback({ responseHeaders: headers })
-    } else {
-      callback({})
     }
+    if (applyNoStore) {
+      headers['cache-control'] = ['no-store']
+    }
+    callback({ responseHeaders: headers })
   })
 }
 

src/main/input/gamepadReader.ts

@@ -1,43 +1,84 @@
 /**
- * Liest Gamepad-Events direkt von /dev/input/js* (Linux joystick API).
- * Umgeht Chromiums Gamepad API, die in Flatpak/Gaming Mode nicht funktioniert,
- * weil Steam Input den Controller virtualisiert und udev-Events nicht
- * in die Sandbox propagieren.
+ * Liest Gamepad-Events via Linux evdev (/dev/input/event*).
+ *
+ * Erkennt Controller über /dev/input/js* und öffnet deren zugehöriges
+ * event*-Interface. Das evdev-Interface liefert standardisierte, benannte
+ * Button-Codes (BTN_SOUTH, BTN_NORTH, …) die über alle Controller-Typen
+ * (Xbox, PlayStation, Nintendo) und Verbindungsarten (USB, Bluetooth)
+ * konsistent sind – unabhängig davon, welchen Treiber der Kernel nutzt.
+ *
+ * Damit entfällt das alte Problem mit der button-Nummerierung im Joystick-API,
+ * bei dem Xbox-One-Controller via Bluetooth (Share-Button verschiebt die
+ * Nummerierung) X-Button als Nummer 3 statt 2 lieferten.
  *
  * Unterstützt mehrere Gamepads gleichzeitig (Steam Deck + Bluetooth Xbox).
  * Hotplug wird durch periodisches Scannen von /dev/input/ abgedeckt.
  *
- * Xbox 360 / Steam Virtual Controller Joystick-Mapping:
- *   Buttons: 0=A, 1=B, 2=X, 3=Y, 4=LB, 5=RB, 6=Back, 7=Start
- *   Axes:    0=LStickX, 1=LStickY, 2=LTrigger, 3=RStickX, 4=RStickY, 5=RTrigger, 6=DPadX, 7=DPadY
+ * BTN_*-Codes sind konsistent für alle Controller:
+ *   BTN_SOUTH (0x130) = A / Cross
+ *   BTN_EAST  (0x131) = B / Circle
+ *   BTN_NORTH (0x133) = X / Square
+ *   BTN_WEST  (0x134) = Y / Triangle
+ *   BTN_TL    (0x136) = LB / L1
+ *   BTN_TR    (0x137) = RB / R1
+ *   BTN_TL2   (0x138) = LT / L2 (als Button bei manchen Controllern)
+ *   BTN_TR2   (0x139) = RT / R2 (als Button bei manchen Controllern)
+ *   ABS_HAT0X (16)    = D-Pad X-Achse
+ *   ABS_HAT0Y (17)    = D-Pad Y-Achse
+ *   ABS_X/Y   (0/1)   = Linker Stick
+ *   ABS_Z/RZ  (2/5)   = LT/RT als Analog-Achse
  */
 
 import * as fs from 'node:fs'
 import * as path from 'node:path'
 import type { BrowserWindow } from 'electron'
 
-// js_event: { u32 time, s16 value, u8 type, u8 number } = 8 bytes
-const JS_EVENT_BUTTON = 0x01
-const JS_EVENT_AXIS = 0x02
-const JS_EVENT_INIT = 0x80
+// evdev input_event auf 64-bit Linux:
+// { u64 tv_sec (8 Bytes), u64 tv_usec (8 Bytes), u16 type (2), u16 code (2), s32 value (4) } = 24 Bytes
+const INPUT_EVENT_SIZE = 24
+
+const EV_KEY = 0x01
+const EV_ABS = 0x03
+
+// Button-Codes (BTN_GAMEPAD-Bereich) – konsistent über alle Controller und Treiber
+const BTN_SOUTH = 0x130
+const BTN_EAST  = 0x131
+const BTN_NORTH = 0x133
+const BTN_WEST  = 0x134
+const BTN_TL    = 0x136
+const BTN_TR    = 0x137
+const BTN_TL2   = 0x138
+const BTN_TR2   = 0x139
+
+// ABS-Achsen-Codes
+const ABS_X     = 0
+const ABS_Y     = 1
+const ABS_Z     = 2   // LT / L2
+const ABS_RZ    = 5   // RT / R2
+const ABS_HAT0X = 16  // D-Pad X
+const ABS_HAT0Y = 17  // D-Pad Y
 
 const BUTTON_MAP: Record<number, string> = {
-  0: 'Enter',   // A
-  1: 'Escape',  // B
-  2: 'x',       // X
-  3: 'y',       // Y
-  4: 'l1',      // LB / L1
-  5: 'r1'       // RB / R1
+  [BTN_SOUTH]: 'Enter',
+  [BTN_EAST]:  'Escape',
+  [BTN_NORTH]: 'x',
+  [BTN_WEST]:  'y',
+  [BTN_TL]:    'l1',
+  [BTN_TR]:    'r1',
+  [BTN_TL2]:   'l2',
+  [BTN_TR2]:   'r2',
 }
 
 const STICK_THRESHOLD = 16384  // ~50% von 32767
+// Trigger-Schwellwert: Achsenwert > 0 (nicht gedrückt) bis ~255–1023 je Controller
+const TRIGGER_THRESHOLD = 8
 const REPEAT_INITIAL_MS = 400
 const REPEAT_INTERVAL_MS = 150
-// L2/R2 Trigger: kein Auto-Repeat, da 300s-Spruenge nicht wiederholt werden sollen.
-const NO_REPEAT_AXES = new Set([2, 5])
+// Trigger-Achsen sollen kein Auto-Repeat auslösen (300s-Sprünge nicht wiederholen)
+const NO_REPEAT_ABS_CODES = new Set([ABS_Z, ABS_RZ])
 const SCAN_INTERVAL_MS = 3000
-// Bluetooth-/Steam-Setups liefern dieselbe Eingabe teils über mehrere js*-Devices.
-// Nahezu zeitgleiche identische Events werden deshalb global entdoppelt.
+// Bluetooth-/Steam-Setups können dieselbe Eingabe über mehrere Devices liefern.
+// Nahezu zeitgleiche identische Events werden global entdoppelt.
 const DUPLICATE_EVENT_WINDOW_MS = 40
 
 interface AxisState {
@@ -46,26 +87,45 @@ interface AxisState {
   interval: ReturnType<typeof setInterval> | null
 }
 
-class JoystickReader {
+/**
+ * Sucht das zugehörige evdev-Device (/dev/input/eventN) für ein
+ * Joystick-Device (/dev/input/jsN) über den /sys-Dateisystem-Pfad.
+ */
+function findEventDevice(jsDevicePath: string): string | null {
+  try {
+    const jsName = path.basename(jsDevicePath)             // 'js0'
+    const sysLink = `/sys/class/input/${jsName}`
+    const realPath = fs.realpathSync(sysLink)              // .../input/input7/js0
+    const inputDir = path.dirname(realPath)                 // .../input/input7
+    const entries = fs.readdirSync(inputDir)
+    const eventEntry = entries.find((e) => /^event\d+$/.test(e))
+    if (eventEntry) return `/dev/input/${eventEntry}`
+  } catch {
+    // Kein /sys-Zugriff oder Device verschwunden
+  }
+  return null
+}
+
+class EvdevReader {
   private stream: fs.ReadStream | null = null
   private buf = Buffer.alloc(0)
   private axes = new Map<number, AxisState>()
   private alive = true
 
   constructor(
-    readonly devicePath: string,
+    readonly eventPath: string,
     private onKey: (key: string) => void
   ) {}
 
   start(): boolean {
     try {
-      this.stream = fs.createReadStream(this.devicePath)
+      this.stream = fs.createReadStream(this.eventPath)
       this.stream.on('data', (chunk) => {
         const buf = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)
         this.buf = Buffer.concat([this.buf, buf])
-        while (this.buf.length >= 8) {
-          this.processEvent(this.buf.subarray(0, 8))
-          this.buf = this.buf.subarray(8)
+        while (this.buf.length >= INPUT_EVENT_SIZE) {
+          this.processEvent(this.buf.subarray(0, INPUT_EVENT_SIZE))
+          this.buf = this.buf.subarray(INPUT_EVENT_SIZE)
         }
       })
       this.stream.on('error', () => {
@@ -96,44 +156,165 @@ class JoystickReader {
     return this.alive
   }
 
+  private processEvent(raw: Buffer): void {
+    // Offsets in 24-Byte input_event: type @ 16, code @ 18, value @ 20
+    const type  = raw.readUInt16LE(16)
+    const code  = raw.readUInt16LE(18)
+    const value = raw.readInt32LE(20)
+
+    if (type === EV_KEY) {
+      if (value === 1) {
+        const key = BUTTON_MAP[code]
+        if (key) this.onKey(key)
+      }
+    } else if (type === EV_ABS) {
+      this.processAxis(code, value)
+    }
+  }
+
+  private processAxis(code: number, value: number): void {
+    let key: string | null = null
+
+    if (code === ABS_HAT0X) {
+      if (value < 0)      key = 'ArrowLeft'
+      else if (value > 0) key = 'ArrowRight'
+    } else if (code === ABS_HAT0Y) {
+      if (value < 0)      key = 'ArrowUp'
+      else if (value > 0) key = 'ArrowDown'
+    } else if (code === ABS_X) {
+      if (value < -STICK_THRESHOLD)     key = 'ArrowLeft'
+      else if (value > STICK_THRESHOLD) key = 'ArrowRight'
+    } else if (code === ABS_Y) {
+      if (value < -STICK_THRESHOLD)     key = 'ArrowUp'
+      else if (value > STICK_THRESHOLD) key = 'ArrowDown'
+    } else if (code === ABS_Z) {
+      if (value > TRIGGER_THRESHOLD) key = 'l2'
+    } else if (code === ABS_RZ) {
+      if (value > TRIGGER_THRESHOLD) key = 'r2'
+    } else {
+      return
+    }
+
+    let state = this.axes.get(code)
+    if (!state) {
+      state = { key: null, timer: null, interval: null }
+      this.axes.set(code, state)
+    }
+
+    if (key !== state.key) {
+      if (state.timer)    clearTimeout(state.timer)
+      if (state.interval) clearInterval(state.interval)
+      state.timer    = null
+      state.interval = null
+      state.key      = key
+
+      if (key) {
+        this.onKey(key)
+        if (!NO_REPEAT_ABS_CODES.has(code)) {
+          const k = key
+          state.timer = setTimeout(() => {
+            if (state!.key === k) {
+              this.onKey(k)
+              state!.interval = setInterval(() => {
+                if (state!.key === k) this.onKey(k)
+              }, REPEAT_INTERVAL_MS)
+            }
+          }, REPEAT_INITIAL_MS)
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Fallback-Reader für den Fall, dass kein evdev-Device gefunden wird.
+ * Nutzt das alte Joystick-API (8-Byte-Events, Joystick-Nummern-Mapping).
+ * Deckt Controller ab, die kein /sys-Event-Device-Mapping haben.
+ */
+class JoystickFallbackReader {
+  private stream: fs.ReadStream | null = null
+  private buf = Buffer.alloc(0)
+  private axes = new Map<number, AxisState>()
+  private alive = true
+
+  private static readonly BUTTON_MAP: Record<number, string> = {
+    0: 'Enter',
+    1: 'Escape',
+    2: 'x',
+    3: 'y',
+    4: 'l1',
+    5: 'r1',
+  }
+
+  constructor(
+    readonly devicePath: string,
+    private onKey: (key: string) => void
+  ) {}
+
+  start(): boolean {
+    try {
+      this.stream = fs.createReadStream(this.devicePath)
+      this.stream.on('data', (chunk) => {
+        const buf = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)
+        this.buf = Buffer.concat([this.buf, buf])
+        while (this.buf.length >= 8) {
+          this.processEvent(this.buf.subarray(0, 8))
+          this.buf = this.buf.subarray(8)
+        }
+      })
+      this.stream.on('error', () => { this.alive = false; this.stop() })
+      this.stream.on('close', () => { this.alive = false })
+      return true
+    } catch {
+      this.alive = false
+      return false
+    }
+  }
+
+  stop(): void {
+    this.stream?.destroy()
+    this.stream = null
+    for (const state of this.axes.values()) {
+      if (state.timer) clearTimeout(state.timer)
+      if (state.interval) clearInterval(state.interval)
+    }
+    this.axes.clear()
+  }
+
+  isAlive(): boolean { return this.alive }
+
   private processEvent(raw: Buffer): void {
     const value   = raw.readInt16LE(4)
     const rawType = raw.readUInt8(6)
     const number  = raw.readUInt8(7)
-    const isInit = (rawType & JS_EVENT_INIT) !== 0
-    const type = rawType & ~JS_EVENT_INIT
+    const isInit  = (rawType & 0x80) !== 0
+    const type    = rawType & ~0x80
 
-    if (type === JS_EVENT_BUTTON && !isInit) {
+    if (type === 0x01 && !isInit) {
       if (value === 1) {
-        const key = BUTTON_MAP[number]
+        const key = JoystickFallbackReader.BUTTON_MAP[number]
         if (key) this.onKey(key)
       }
-    } else if (type === JS_EVENT_AXIS) {
+    } else if (type === 0x02) {
       this.processAxis(number, value, isInit)
     }
   }
 
   private processAxis(axis: number, value: number, isInit: boolean): void {
     let key: string | null = null
-
-    // D-Pad (Axes 6/7): binäre Werte (-32767, 0, 32767)
     if (axis === 6) {
       if (value < 0) key = 'ArrowLeft'
       else if (value > 0) key = 'ArrowRight'
     } else if (axis === 7) {
       if (value < 0) key = 'ArrowUp'
       else if (value > 0) key = 'ArrowDown'
-    }
-    // Left Stick (Axes 0/1): analoge Werte mit Deadzone
-    else if (axis === 0) {
+    } else if (axis === 0) {
       if (value < -STICK_THRESHOLD)     key = 'ArrowLeft'
       else if (value > STICK_THRESHOLD) key = 'ArrowRight'
     } else if (axis === 1) {
       if (value < -STICK_THRESHOLD)     key = 'ArrowUp'
       else if (value > STICK_THRESHOLD) key = 'ArrowDown'
-    }
-    // Trigger (Axes 2/5): -32767 = nicht gedrückt, +32767 = voll gedrückt
-    else if (axis === 2) {
+    } else if (axis === 2) {
       if (value > 0) key = 'l2'
     } else if (axis === 5) {
       if (value > 0) key = 'r2'
@@ -156,7 +337,7 @@ class JoystickReader {
 
       if (key && !isInit) {
         this.onKey(key)
-        if (!NO_REPEAT_AXES.has(axis)) {
+        if (axis !== 2 && axis !== 5) {
           const k = key
           state.timer = setTimeout(() => {
             if (state!.key === k) {
@@ -173,13 +354,14 @@ class JoystickReader {
 }
 
 /**
- * Startet das Lesen aller /dev/input/js* Devices.
+ * Startet das Lesen aller /dev/input/js* Devices (evdev-Interface bevorzugt).
  * Gibt eine Cleanup-Funktion zurück.
  */
 export function startGamepadReader(getWindow: () => BrowserWindow | null): () => void {
   if (process.platform !== 'linux') return () => {}
 
-  const readers = new Map<string, JoystickReader>()
+  // Keyed by js-Device-Pfad
+  const readers = new Map<string, EvdevReader | JoystickFallbackReader>()
   const lastKeyAt = new Map<string, number>()
 
   const onKey = (key: string): void => {
@@ -201,31 +383,42 @@ export function startGamepadReader(getWindow: () => BrowserWindow | null): () =>
 
       for (const entry of entries) {
         if (!entry.startsWith('js')) continue
-        const devPath = path.join(inputDir, entry)
-        seen.add(devPath)
+        const jsPath = path.join(inputDir, entry)
+        seen.add(jsPath)
 
-        if (readers.has(devPath)) {
-          if (!readers.get(devPath)!.isAlive()) {
-            readers.get(devPath)!.stop()
-            readers.delete(devPath)
+        if (readers.has(jsPath)) {
+          if (!readers.get(jsPath)!.isAlive()) {
+            readers.get(jsPath)!.stop()
+            readers.delete(jsPath)
           } else {
             continue
           }
         }
 
-        const reader = new JoystickReader(devPath, onKey)
+        const eventPath = findEventDevice(jsPath)
+        let reader: EvdevReader | JoystickFallbackReader
+
+        if (eventPath) {
+          reader = new EvdevReader(eventPath, onKey)
           if (reader.start()) {
-          readers.set(devPath, reader)
-          console.log(`[gamepad] geöffnet: ${devPath}`)
+            readers.set(jsPath, reader)
+            console.log(`[gamepad] geöffnet (evdev): ${jsPath} → ${eventPath}`)
+          }
+        } else {
+          // Fallback auf altes Joystick-API wenn kein /sys-Mapping gefunden
+          reader = new JoystickFallbackReader(jsPath, onKey)
+          if (reader.start()) {
+            readers.set(jsPath, reader)
+            console.log(`[gamepad] geöffnet (js-fallback): ${jsPath}`)
+          }
         }
       }
 
-      // Entfernte Devices aufräumen
-      for (const [devPath, reader] of readers) {
-        if (!seen.has(devPath)) {
-          console.log(`[gamepad] getrennt: ${devPath}`)
+      for (const [jsPath, reader] of readers) {
+        if (!seen.has(jsPath)) {
+          console.log(`[gamepad] getrennt: ${jsPath}`)
           reader.stop()
-          readers.delete(devPath)
+          readers.delete(jsPath)
         }
       }
     } catch {

src/main/ipc/handlers.ts

@@ -1,4 +1,5 @@
-import { app, BrowserWindow, ipcMain } from 'electron'
+import { app, BrowserWindow, ipcMain, session } from 'electron'
+import { setHlsCacheEnabled } from '../prefs/hlsCachePref'
 import { appendFileSync } from 'node:fs'
 import { join } from 'node:path'
 import type { AuthEvent, AuthService } from '../auth/authService'
@@ -31,10 +32,15 @@ export const IPC = {
   playbackStop: 'playback:stop',
   playbackPause: 'playback:pause',
   playbackReportPosition: 'playback:report-position',
+  playbackGetQualities: 'playback:get-qualities',
   /** main → renderer */
   playbackEvent: 'playback:event',
   /** main → renderer: HLS-URL + Metadaten für den Renderer-seitigen Video-Player */
-  playbackHlsUrl: 'playback:hls-url'
+  playbackHlsUrl: 'playback:hls-url',
+
+  appGetCacheSize: 'app:get-cache-size',
+  appClearCache: 'app:clear-cache',
+  appSetHlsCacheEnabled: 'app:set-hls-cache-enabled'
 } as const
 
 export function registerIpcHandlers(
@@ -46,6 +52,12 @@ export function registerIpcHandlers(
     app.quit()
   })
 
+  ipcMain.handle(IPC.appGetCacheSize, () => session.defaultSession.getCacheSize())
+  ipcMain.handle(IPC.appClearCache, () => session.defaultSession.clearCache())
+  ipcMain.handle(IPC.appSetHlsCacheEnabled, (_e, enabled: boolean) => {
+    setHlsCacheEnabled(Boolean(enabled))
+  })
+
   ipcMain.handle(IPC.authStatus, () => auth.getStatus())
   ipcMain.handle(IPC.authConfigured, () => auth.isConfigured())
   ipcMain.handle(IPC.authStart, () => auth.startDeviceFlow())
@@ -95,8 +107,12 @@ export function registerIpcHandlers(
   )
   ipcMain.handle(
     IPC.playbackStartVod,
-    (_e, vodId: string, channelLogin: string, title: string, durationSeconds: number, startSeconds?: number) =>
-      playback.startVod(vodId, channelLogin, title, durationSeconds, startSeconds)
+    (_e, vodId: string, channelLogin: string, title: string, durationSeconds: number, startSeconds?: number, quality?: string) =>
+      playback.startVod(vodId, channelLogin, title, durationSeconds, startSeconds, quality)
+  )
+  ipcMain.handle(
+    IPC.playbackGetQualities,
+    (_e, twitchUrl: string) => playback.getAvailableQualities(twitchUrl)
   )
   ipcMain.handle(IPC.playbackStop, () => playback.stop())
   ipcMain.handle(IPC.playbackPause, () => {

src/main/playback/playbackService.ts

@@ -1,5 +1,5 @@
 import { EventEmitter } from 'node:events'
-import { getStreamUrl } from './streamlink'
+import { getAvailableQualities, getStreamUrl } from './streamlink'
 import type { PlaybackEvent } from './types'
 import * as history from '../store/historyRepo'
 
@@ -32,12 +32,17 @@ export class PlaybackService extends EventEmitter {
     this.emit('playback-event', { kind: 'started', isLive: true } satisfies PlaybackEvent)
   }
 
+  getAvailableQualities(twitchUrl: string): Promise<string[]> {
+    return getAvailableQualities(twitchUrl)
+  }
+
   async startVod(
     vodId: string,
     channelLogin: string,
     title: string,
     durationSeconds: number,
-    startSeconds?: number
+    startSeconds?: number,
+    quality = 'best'
   ): Promise<void> {
     const resumePos = history.getPosition(vodId)
     history.upsertVod({
@@ -50,7 +55,7 @@ export class PlaybackService extends EventEmitter {
 
     let hlsUrl: string
     try {
-      hlsUrl = await getStreamUrl(`https://www.twitch.tv/videos/${vodId}`, 'best')
+      hlsUrl = await getStreamUrl(`https://www.twitch.tv/videos/${vodId}`, quality)
     } catch (e) {
       this.emit('playback-event', {
         kind: 'error',

src/main/playback/streamlink.ts

@@ -18,6 +18,43 @@ function resolveStreamlinkBin(): string {
 
 const STREAMLINK_BIN = resolveStreamlinkBin()
 
+const QUALITY_ORDER = ['best', '1080p60', '1080p', '720p60', '720p', '480p', '360p', '160p', 'audio_only', 'worst']
+
+function sortQualities(qualities: string[]): string[] {
+  return [...qualities].sort((a, b) => {
+    const ai = QUALITY_ORDER.indexOf(a)
+    const bi = QUALITY_ORDER.indexOf(b)
+    if (ai === -1 && bi === -1) return a.localeCompare(b)
+    if (ai === -1) return 1
+    if (bi === -1) return -1
+    return ai - bi
+  })
+}
+
+/**
+ * Fragt streamlink nach allen verfügbaren Qualitätsstufen für eine URL (--json).
+ * Gibt eine sortierte Liste zurück; bei Fehler leeres Array.
+ */
+export function getAvailableQualities(url: string): Promise<string[]> {
+  return new Promise((resolve) => {
+    const proc = spawn(STREAMLINK_BIN, ['--json', url], {
+      stdio: ['ignore', 'pipe', 'pipe']
+    })
+    let out = ''
+    proc.stdout?.on('data', (d: Buffer) => { out += d.toString() })
+    proc.on('error', () => resolve([]))
+    proc.on('exit', () => {
+      try {
+        const json = JSON.parse(out) as { streams?: Record<string, unknown> }
+        const keys = Object.keys(json.streams ?? {})
+        resolve(sortQualities(keys))
+      } catch {
+        resolve([])
+      }
+    })
+  })
+}
+
 /**
  * Fragt streamlink nach der direkten HLS-URL für einen Stream oder VOD.
  * Wird für Live-Streams (twitch.tv/<login>) und VODs (twitch.tv/videos/<id>) verwendet.

src/main/prefs/hlsCachePref.ts

@@ -0,0 +1,9 @@
+let hlsCacheEnabled = false
+
+export function getHlsCacheEnabled(): boolean {
+  return hlsCacheEnabled
+}
+
+export function setHlsCacheEnabled(enabled: boolean): void {
+  hlsCacheEnabled = enabled
+}

src/preload/index.ts

@@ -22,9 +22,14 @@ const IPC = {
   playbackStop: 'playback:stop',
   playbackPause: 'playback:pause',
   playbackReportPosition: 'playback:report-position',
+  playbackGetQualities: 'playback:get-qualities',
   playbackEvent: 'playback:event',
   playbackHlsUrl: 'playback:hls-url',
 
+  appGetCacheSize: 'app:get-cache-size',
+  appClearCache: 'app:clear-cache',
+  appSetHlsCacheEnabled: 'app:set-hls-cache-enabled',
+
   gamepadInput: 'gamepad-input'
 } as const
 
@@ -118,7 +123,10 @@ export interface TopStreamsResult {
 const api = {
   appVersion: process.env.APP_VERSION ?? process.env.npm_package_version ?? '0.0.0-dev',
   app: {
-    quit: (): Promise<void> => ipcRenderer.invoke(IPC.appQuit)
+    quit: (): Promise<void> => ipcRenderer.invoke(IPC.appQuit),
+    getCacheSize: (): Promise<number> => ipcRenderer.invoke(IPC.appGetCacheSize),
+    clearCache: (): Promise<void> => ipcRenderer.invoke(IPC.appClearCache),
+    setHlsCacheEnabled: (enabled: boolean): Promise<void> => ipcRenderer.invoke(IPC.appSetHlsCacheEnabled, enabled)
   },
   auth: {
     isConfigured: (): Promise<boolean> => ipcRenderer.invoke(IPC.authConfigured),
@@ -153,8 +161,10 @@ const api = {
   playback: {
     startLive: (channelLogin: string, quality?: string): Promise<void> =>
       ipcRenderer.invoke(IPC.playbackStartLive, channelLogin, quality),
-    startVod: (vodId: string, channelLogin: string, title: string, durationSeconds: number, startSeconds?: number): Promise<void> =>
-      ipcRenderer.invoke(IPC.playbackStartVod, vodId, channelLogin, title, durationSeconds, startSeconds),
+    startVod: (vodId: string, channelLogin: string, title: string, durationSeconds: number, startSeconds?: number, quality?: string): Promise<void> =>
+      ipcRenderer.invoke(IPC.playbackStartVod, vodId, channelLogin, title, durationSeconds, startSeconds, quality),
+    getQualities: (twitchUrl: string): Promise<string[]> =>
+      ipcRenderer.invoke(IPC.playbackGetQualities, twitchUrl),
     stop: (): Promise<void> => ipcRenderer.invoke(IPC.playbackStop),
     pause: (): Promise<void> => ipcRenderer.invoke(IPC.playbackPause),
     reportPosition: (vodId: string, positionSeconds: number, durationSeconds: number): Promise<void> =>

src/renderer/src/components/Icons.tsx

@@ -122,3 +122,14 @@ export function ClapperboardIcon(props: IconProps): JSX.Element {
     </svg>
   )
 }
+
+export function QualityIcon(props: IconProps): JSX.Element {
+  return (
+    <svg {...base} {...props}>
+      <rect x="2" y="17" width="4" height="4" rx="0.5" />
+      <rect x="8" y="13" width="4" height="8" rx="0.5" />
+      <rect x="14" y="9" width="4" height="12" rx="0.5" />
+      <rect x="20" y="4" width="2" height="17" rx="0.5" />
+    </svg>
+  )
+}

src/renderer/src/components/PlaybackOverlay.tsx

@@ -1,6 +1,6 @@
 import { useCallback, useEffect, useRef, useState } from 'react'
 import { GamepadHintItem } from './GamepadPrompt'
-import { ClapperboardIcon, EyeIcon, GamepadIcon, PauseIcon, PlayIcon, StopIcon } from './Icons'
+import { ClapperboardIcon, EyeIcon, GamepadIcon, PauseIcon, PlayIcon, QualityIcon, StopIcon } from './Icons'
 
 interface PlaybackOverlayProps {
   playState: 'playing' | 'paused'
@@ -13,10 +13,19 @@ interface PlaybackOverlayProps {
   viewerCount?: number
   viewCount?: number
   gameName?: string
+  currentChapterIndex?: number
+  totalChapters?: number
+  availableQualities?: string[]
+  currentQuality?: string
+  qualityPanelOpen?: boolean
+  qualityFocusedIndex?: number
+  onOpenQuality?: () => void
+  onChangeQuality?: (q: string) => void
   onTogglePause: () => void
   onSeek: (seconds: number) => void
   onSeekTo: (seconds: number) => void
   onStop: () => void
+  onOpenChapters?: () => void
 }
 
 function formatCount(n: number): string {
@@ -48,10 +57,19 @@ export function PlaybackOverlay({
   viewerCount,
   viewCount,
   gameName,
+  currentChapterIndex,
+  totalChapters,
+  availableQualities,
+  currentQuality,
+  qualityPanelOpen,
+  qualityFocusedIndex,
+  onOpenQuality,
+  onChangeQuality,
   onTogglePause,
   onSeek,
   onSeekTo,
-  onStop
+  onStop,
+  onOpenChapters
 }: PlaybackOverlayProps): JSX.Element {
   const [visible, setVisible] = useState(true)
   const [isScrubbing, setIsScrubbing] = useState(false)
@@ -219,6 +237,8 @@ export function PlaybackOverlay({
         <span className="playback-overlay__hint-sep">·</span>
         <GamepadHintItem prompt="y">Kapitelmenü</GamepadHintItem>
         <span className="playback-overlay__hint-sep">·</span>
+        <GamepadHintItem prompt="x">Qualität</GamepadHintItem>
+        <span className="playback-overlay__hint-sep">·</span>
         <GamepadHintItem prompt="b">Stop</GamepadHintItem>
       </div>
 
@@ -302,6 +322,13 @@ export function PlaybackOverlay({
                 <span className="playback-overlay__meta-chip">
                   <GamepadIcon width={14} height={14} />
                   {gameName}
+                  {currentChapterIndex !== undefined &&
+                    totalChapters !== undefined &&
+                    totalChapters > 1 && (
+                      <span className="playback-overlay__chapter-badge">
+                        {currentChapterIndex}/{totalChapters}
+                      </span>
+                    )}
                 </span>
               )}
             </div>
@@ -333,7 +360,58 @@ export function PlaybackOverlay({
           </>
         ) : null}
 
-        {/* Stop button */}
+        {/* Action buttons row */}
+        <div className="playback-overlay__action-row">
+          {!isLive && totalChapters !== undefined && totalChapters > 0 && onOpenChapters && (
+            <div className="playback-overlay__chapter-btn-wrap">
+              <button
+                className="playback-overlay__chapter-btn"
+                onClick={() => { onOpenChapters(); showOverlay() }}
+                aria-label="Kapitel öffnen"
+              >
+                <ClapperboardIcon width={18} height={18} />
+                <span>Kapitel</span>
+              </button>
+              {totalChapters > 1 && (
+                <span className="playback-overlay__chapter-ios-badge">
+                  {totalChapters}
+                </span>
+              )}
+            </div>
+          )}
+          {onOpenQuality && availableQualities !== undefined && availableQualities.length > 0 && (
+            <div className="playback-overlay__quality-wrap">
+              <button
+                className="playback-overlay__quality-btn"
+                onClick={() => { onOpenQuality(); showOverlay() }}
+                aria-label="Qualität ändern"
+              >
+                <QualityIcon width={18} height={18} />
+                <span>{currentQuality ?? 'best'}</span>
+              </button>
+              {qualityPanelOpen && (
+                <div className="playback-overlay__quality-panel">
+                  <div className="playback-overlay__quality-panel-title">Qualität</div>
+                  <ul className="playback-overlay__quality-list">
+                    {availableQualities.map((q, i) => (
+                      <li
+                        key={q}
+                        className={[
+                          'playback-overlay__quality-item',
+                          i === qualityFocusedIndex ? 'playback-overlay__quality-item--focused' : '',
+                          q === currentQuality ? 'playback-overlay__quality-item--active' : ''
+                        ].join(' ').trim()}
+                        onClick={() => { onChangeQuality?.(q); showOverlay() }}
+                      >
+                        <span>{q}</span>
+                        {q === currentQuality && <span className="playback-overlay__quality-check">✓</span>}
+                      </li>
+                    ))}
+                  </ul>
+                </div>
+              )}
+            </div>
+          )}
           <button
             className="playback-overlay__stop-btn"
             onClick={() => { onStop(); showOverlay() }}
@@ -343,6 +421,7 @@ export function PlaybackOverlay({
             <span>Stop</span>
           </button>
         </div>
+      </div>
 
       {/* Bottom gradient scrim */}
       <div className="playback-overlay__scrim-bottom" />

src/renderer/src/context/SettingsContext.tsx

@@ -6,6 +6,7 @@ export interface AppSettings {
   streamBadgeMode: StreamBadgeMode
   sidebarWidth: number
   badgeGap: number
+  hlsCacheEnabled: boolean
 }
 
 const STORAGE_KEY = 't4sd:settings'
@@ -16,9 +17,10 @@ const BADGE_GAP_MIN = 0
 const BADGE_GAP_MAX = 20
 const BADGE_GAP_DEFAULT = 6
 const DEFAULTS: AppSettings = {
-  streamBadgeMode: 'language',
+  streamBadgeMode: 'both',
   sidebarWidth: SIDEBAR_DEFAULT,
-  badgeGap: BADGE_GAP_DEFAULT
+  badgeGap: BADGE_GAP_DEFAULT,
+  hlsCacheEnabled: false
 }
 
 export { SIDEBAR_MIN, SIDEBAR_MAX, SIDEBAR_DEFAULT, BADGE_GAP_MIN, BADGE_GAP_MAX, BADGE_GAP_DEFAULT }
@@ -36,7 +38,8 @@ function loadSettings(): AppSettings {
         ? (parsed.streamBadgeMode as StreamBadgeMode)
         : DEFAULTS.streamBadgeMode,
       sidebarWidth: sw >= SIDEBAR_MIN && sw <= SIDEBAR_MAX ? sw : SIDEBAR_DEFAULT,
-      badgeGap: bg >= BADGE_GAP_MIN && bg <= BADGE_GAP_MAX ? bg : BADGE_GAP_DEFAULT
+      badgeGap: bg >= BADGE_GAP_MIN && bg <= BADGE_GAP_MAX ? bg : BADGE_GAP_DEFAULT,
+      hlsCacheEnabled: typeof parsed.hlsCacheEnabled === 'boolean' ? parsed.hlsCacheEnabled : DEFAULTS.hlsCacheEnabled
     }
   } catch {
     return DEFAULTS
@@ -56,6 +59,7 @@ interface SettingsCtx {
   setStreamBadgeMode: (mode: StreamBadgeMode) => void
   setSidebarWidth: (width: number) => void
   setBadgeGap: (gap: number) => void
+  setHlsCacheEnabled: (enabled: boolean) => void
 }
 
 const SettingsContext = createContext<SettingsCtx | null>(null)
@@ -66,6 +70,7 @@ export function SettingsProvider({ children }: { children: React.ReactNode }): J
   useEffect(() => {
     document.documentElement.style.setProperty('--sidebar-width', `${settings.sidebarWidth}px`)
     document.documentElement.style.setProperty('--badge-gap', `${settings.badgeGap}px`)
+    void window.t4sd.app.setHlsCacheEnabled(settings.hlsCacheEnabled)
   }, []) // eslint-disable-line react-hooks/exhaustive-deps
 
   const setStreamBadgeMode = useCallback((mode: StreamBadgeMode) => {
@@ -96,8 +101,17 @@ export function SettingsProvider({ children }: { children: React.ReactNode }): J
     document.documentElement.style.setProperty('--badge-gap', `${clamped}px`)
   }, [])
 
+  const setHlsCacheEnabled = useCallback((enabled: boolean) => {
+    setSettings((prev) => {
+      const next = { ...prev, hlsCacheEnabled: enabled }
+      saveSettings(next)
+      return next
+    })
+    void window.t4sd.app.setHlsCacheEnabled(enabled)
+  }, [])
+
   return (
-    <SettingsContext.Provider value={{ settings, setStreamBadgeMode, setSidebarWidth, setBadgeGap }}>
+    <SettingsContext.Provider value={{ settings, setStreamBadgeMode, setSidebarWidth, setBadgeGap, setHlsCacheEnabled }}>
       {children}
     </SettingsContext.Provider>
   )

src/renderer/src/screens/AppShell.tsx

@@ -37,6 +37,11 @@ export default function AppShell({ onLogout }: Props): JSX.Element {
   const liveVideoRef = useRef<VideoPlayerHandle>(null)
   // Verhindert dass ChannelScreen-Events den globalen Overlay aktivieren
   const isGlobalPlaybackInitiated = useRef(false)
+  // Quality state für globalen Overlay
+  const [liveAvailableQualities, setLiveAvailableQualities] = useState<string[] | undefined>(undefined)
+  const [liveCurrentQuality, setLiveCurrentQuality] = useState('best')
+  const [liveQualityPanelOpen, setLiveQualityPanelOpen] = useState(false)
+  const [liveQualityFocusedIndex, setLiveQualityFocusedIndex] = useState(0)
 
   const isGlobalPlaying = livePlayState !== 'idle'
 
@@ -57,6 +62,9 @@ export default function AppShell({ onLogout }: Props): JSX.Element {
         setLivePlayState('idle')
         setLiveChannel(null)
         setLivePosition(0)
+        setLiveAvailableQualities(undefined)
+        setLiveCurrentQuality('best')
+        setLiveQualityPanelOpen(false)
       }
     })
     return () => { unsubHls(); unsubEvent() }
@@ -95,14 +103,38 @@ export default function AppShell({ onLogout }: Props): JSX.Element {
     isGlobalPlaybackInitiated.current = true
     setLiveChannel(ch)
     setLivePlayState('starting')
-    void window.t4sd.playback.startLive(ch.broadcasterLogin)
+    setLiveAvailableQualities(undefined)
+    setLiveCurrentQuality('best')
+    setLiveQualityPanelOpen(false)
+    void window.t4sd.playback.startLive(ch.broadcasterLogin).then(() => {
+      window.t4sd.playback.getQualities(`twitch.tv/${ch.broadcasterLogin}`)
+        .then((qs) => setLiveAvailableQualities(qs.length > 0 ? qs : []))
+        .catch(() => setLiveAvailableQualities([]))
+    })
   }, [])
 
   const handleStopLive = useCallback(() => {
     liveVideoRef.current?.stop()
+    setLiveAvailableQualities(undefined)
+    setLiveCurrentQuality('best')
+    setLiveQualityPanelOpen(false)
     void window.t4sd.playback.stop()
   }, [])
 
+  const handleLiveQualityChange = useCallback((quality: string, channelLogin: string) => {
+    setLiveQualityPanelOpen(false)
+    setLiveCurrentQuality(quality)
+    setLiveAvailableQualities(undefined)
+    liveVideoRef.current?.stop()
+    setLiveHlsPayload(null)
+    setLivePlayState('starting')
+    void window.t4sd.playback.startLive(channelLogin, quality).then(() => {
+      window.t4sd.playback.getQualities(`twitch.tv/${channelLogin}`)
+        .then((qs) => setLiveAvailableQualities(qs.length > 0 ? qs : []))
+        .catch(() => setLiveAvailableQualities([]))
+    })
+  }, [])
+
   const handleBack = useCallback(() => {
     setSelectedChannel(null)
   }, [])
@@ -115,6 +147,25 @@ export default function AppShell({ onLogout }: Props): JSX.Element {
   useEffect(() => {
     if (!isGlobalPlaying) return
     const onKey = (e: KeyboardEvent): void => {
+      // Quality-Panel hat Vorrang wenn geöffnet
+      if (liveQualityPanelOpen) {
+        if (e.key === 'ArrowUp') {
+          e.preventDefault()
+          setLiveQualityFocusedIndex((i) => Math.max(0, i - 1))
+        } else if (e.key === 'ArrowDown') {
+          e.preventDefault()
+          setLiveQualityFocusedIndex((i) => Math.min((liveAvailableQualities?.length ?? 1) - 1, i + 1))
+        } else if (e.key === 'Enter' || e.key === ' ') {
+          e.preventDefault()
+          const q = liveAvailableQualities?.[liveQualityFocusedIndex]
+          if (q && liveChannel) handleLiveQualityChange(q, liveChannel.broadcasterLogin)
+        } else if (e.key === 'Escape') {
+          e.preventDefault()
+          setLiveQualityPanelOpen(false)
+        }
+        return
+      }
+
       switch (e.key) {
         case 'Escape':
           e.preventDefault()
@@ -147,11 +198,19 @@ export default function AppShell({ onLogout }: Props): JSX.Element {
           e.preventDefault()
           liveVideoRef.current?.seek(300)
           break
+        case 'x':
+          e.preventDefault()
+          if (liveAvailableQualities && liveAvailableQualities.length > 0) {
+            const idx = liveAvailableQualities.indexOf(liveCurrentQuality)
+            setLiveQualityFocusedIndex(idx >= 0 ? idx : 0)
+            setLiveQualityPanelOpen(true)
+          }
+          break
       }
     }
     window.addEventListener('keydown', onKey)
     return () => window.removeEventListener('keydown', onKey)
-  }, [isGlobalPlaying, livePlayState, handleStopLive])
+  }, [isGlobalPlaying, livePlayState, handleStopLive, liveQualityPanelOpen, liveAvailableQualities, liveQualityFocusedIndex, liveCurrentQuality, liveChannel, handleLiveQualityChange])
 
   // Key-Handler für die Sidebar (wenn sie den Fokus hat)
   useEffect(() => {
@@ -323,6 +382,16 @@ export default function AppShell({ onLogout }: Props): JSX.Element {
                   title={liveChannel?.streamTitle ?? ''}
                   viewerCount={liveChannel?.viewerCount ?? undefined}
                   gameName={liveChannel?.gameName ?? undefined}
+                  availableQualities={liveAvailableQualities}
+                  currentQuality={liveCurrentQuality}
+                  qualityPanelOpen={liveQualityPanelOpen}
+                  qualityFocusedIndex={liveQualityFocusedIndex}
+                  onOpenQuality={() => {
+                    const idx = liveAvailableQualities?.indexOf(liveCurrentQuality) ?? 0
+                    setLiveQualityFocusedIndex(idx >= 0 ? idx : 0)
+                    setLiveQualityPanelOpen(true)
+                  }}
+                  onChangeQuality={(q) => liveChannel && handleLiveQualityChange(q, liveChannel.broadcasterLogin)}
                   onTogglePause={() => {
                     if (livePlayState === 'playing') {
                       liveVideoRef.current?.pause()

src/renderer/src/screens/ChannelScreen.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useMemo, useRef, useState } from 'react'
 import { GamepadHintItem, GamepadPrompt } from '../components/GamepadPrompt'
+import { EyeIcon } from '../components/Icons'
 import { PlaybackOverlay } from '../components/PlaybackOverlay'
 import { VideoPlayer, type VideoPlayerHandle } from '../components/VideoPlayer'
 import type { FollowedChannelInfo, HlsUrlPayload, PlaybackEvent, VodChapter, VodInfo, VodProgress } from '../types/t4sd'
@@ -21,6 +22,12 @@ function formatViewers(n: number): string {
   return String(n)
 }
 
+function formatCount(n: number): string {
+  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1)}M`
+  if (n >= 1_000) return `${(n / 1_000).toFixed(1)}K`
+  return String(n)
+}
+
 function formatDuration(s: number): string {
   const h = Math.floor(s / 3600)
   const m = Math.floor((s % 3600) / 60)
@@ -72,7 +79,6 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
   const [vodChaptersLoaded, setVodChaptersLoaded] = useState(false)
   const [chaptersLoading, setChaptersLoading] = useState(false)
   const [chapterIndex, setChapterIndex] = useState(0)
-  const [wasPlayingBeforeChapters, setWasPlayingBeforeChapters] = useState(false)
   const [currentVod, setCurrentVod] = useState<VodInfo | null>(null)
   const [pendingChapterVod, setPendingChapterVod] = useState<VodInfo | null>(null)
   // Overlay state
@@ -81,6 +87,11 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
   const [isLivePlayback, setIsLivePlayback] = useState(false)
   // HLS-Player state
   const [hlsPayload, setHlsPayload] = useState<HlsUrlPayload | null>(null)
+  // Quality state
+  const [availableQualities, setAvailableQualities] = useState<string[] | undefined>(undefined)
+  const [currentQuality, setCurrentQuality] = useState('best')
+  const [qualityPanelOpen, setQualityPanelOpen] = useState(false)
+  const [qualityFocusedIndex, setQualityFocusedIndex] = useState(0)
 
   // Derive active chapter name from chapters list + current playback position.
   // Three states: loading → undefined (chip hidden), loaded+empty → 'Unbekannt', loaded+chapters → active chapter.
@@ -92,6 +103,14 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     return active?.gameName ?? 'Unbekannt'
   }, [chapters, vodChaptersLoaded, currentPosition, isLivePlayback])
 
+  const currentChapterIndex = useMemo<number | undefined>(() => {
+    if (isLivePlayback || !vodChaptersLoaded || chapters.length === 0) return undefined
+    for (let i = chapters.length - 1; i >= 0; i--) {
+      if (chapters[i].positionSeconds <= currentPosition) return i + 1
+    }
+    return 1
+  }, [chapters, vodChaptersLoaded, currentPosition, isLivePlayback])
+
   const watchBtnRef = useRef<HTMLButtonElement>(null)
   const chapterListRef = useRef<HTMLUListElement>(null)
   const videoRef = useRef<VideoPlayerHandle>(null)
@@ -117,17 +136,8 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
         const duringPlayback = isPlaying
         if (e.key === 'Escape') {
           e.preventDefault()
-          if (duringPlayback) {
           setChapterPanelVod(null)
-            setFocusRegion('hero')
-            if (wasPlayingBeforeChapters) {
-              videoRef.current?.play()
-              setPlayState('playing')
-            }
-          } else {
-            setChapterPanelVod(null)
-            setFocusRegion('shelf')
-          }
+          setFocusRegion(duringPlayback ? 'hero' : 'shelf')
         } else if (e.key === 'ArrowDown') {
           e.preventDefault()
           setChapterIndex((i) => Math.min(Math.max(0, chapters.length - 1), i + 1))
@@ -142,13 +152,6 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
           if (duringPlayback) {
             if (chapter) {
               videoRef.current?.seekTo(chapter.positionSeconds)
-              videoRef.current?.play()
-              setPlayState('playing')
-            } else {
-              if (wasPlayingBeforeChapters) {
-                videoRef.current?.play()
-                setPlayState('playing')
-              }
             }
             setChapterPanelVod(null)
             setFocusRegion('hero')
@@ -160,12 +163,36 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
               setChapterPanelVod(null)
             }
           }
+        } else if (e.key === 'x' && duringPlayback && chapters.length === 0 && !chaptersLoading) {
+          e.preventDefault()
+          videoRef.current?.seekTo(0)
+          setChapterPanelVod(null)
+          setFocusRegion('hero')
         }
         return
       }
 
       // Während der Wiedergabe: nur Playback-Steuerung erlauben, keine Navigation
       if (isPlaying) {
+        // Quality-Panel hat Vorrang wenn geöffnet
+        if (qualityPanelOpen) {
+          if (e.key === 'ArrowUp') {
+            e.preventDefault()
+            setQualityFocusedIndex((i) => Math.max(0, i - 1))
+          } else if (e.key === 'ArrowDown') {
+            e.preventDefault()
+            setQualityFocusedIndex((i) => Math.min((availableQualities?.length ?? 1) - 1, i + 1))
+          } else if (e.key === 'Enter' || e.key === ' ') {
+            e.preventDefault()
+            const q = availableQualities?.[qualityFocusedIndex]
+            if (q) void handleQualityChange(q)
+          } else if (e.key === 'Escape') {
+            e.preventDefault()
+            setQualityPanelOpen(false)
+          }
+          return
+        }
+
         switch (e.key) {
           case 'l2':
             e.preventDefault()
@@ -205,6 +232,14 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
             if (vod) openChapterPanel(vod, true)
             break
           }
+          case 'x':
+            e.preventDefault()
+            if (availableQualities && availableQualities.length > 0) {
+              const idx = availableQualities.indexOf(currentQuality)
+              setQualityFocusedIndex(idx >= 0 ? idx : 0)
+              setQualityPanelOpen(true)
+            }
+            break
           case 'l1':
             e.preventDefault()
             void jumpChapter(-1)
@@ -261,7 +296,7 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     }
     window.addEventListener('keydown', onKey)
     return () => window.removeEventListener('keydown', onKey)
-  }, [focusRegion, playState, vods, shelfIndex, onBack, chapters, chapterIndex, chapterPanelVod, wasPlayingBeforeChapters, currentVod])
+  }, [focusRegion, playState, vods, shelfIndex, onBack, chapters, chapterIndex, chapterPanelVod, currentVod, qualityPanelOpen, availableQualities, qualityFocusedIndex, currentQuality])
 
   // playback:event — verarbeitet started / stopped / error
   useEffect(() => {
@@ -277,6 +312,9 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
         setHlsPayload(null)
         setChapterPanelVod(null)
         setCurrentVod(null)
+        setAvailableQualities(undefined)
+        setCurrentQuality('best')
+        setQualityPanelOpen(false)
         // Progress nach Stop neu laden
         if (vods.length > 0) {
           void window.t4sd.history
@@ -296,6 +334,9 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
         setChapterPanelVod(null)
         setCurrentVod(null)
         setPendingChapterVod(null)
+        setAvailableQualities(undefined)
+        setCurrentQuality('best')
+        setQualityPanelOpen(false)
         setErrorMsg(ev.message ?? 'Unbekannter Fehler')
       }
     })
@@ -331,7 +372,6 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     setChapterIndex(0)
     setChaptersLoading(true)
     setFocusRegion('chapters')
-    setWasPlayingBeforeChapters(false)
     void loadChapters(vod.id)
       .then((loaded) => setChapters(loaded))
       .catch(() => {})
@@ -358,12 +398,19 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
   const handleWatch = async (): Promise<void> => {
     setPlayState('starting')
     setErrorMsg('')
+    setAvailableQualities(undefined)
+    setCurrentQuality('best')
+    setQualityPanelOpen(false)
     try {
       await window.t4sd.playback.startLive(channel.broadcasterLogin)
     } catch (e) {
       setPlayState('error')
       setErrorMsg(String(e))
+      return
     }
+    window.t4sd.playback.getQualities(`twitch.tv/${channel.broadcasterLogin}`)
+      .then((qs) => setAvailableQualities(qs.length > 0 ? qs : []))
+      .catch(() => setAvailableQualities([]))
   }
 
   const handleWatchVod = async (vod: VodInfo): Promise<void> => {
@@ -371,10 +418,12 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     setErrorMsg('')
     setFocusRegion('hero')
     setChapterPanelVod(null)
-    setWasPlayingBeforeChapters(false)
     setCurrentVod(vod)
     setPendingChapterVod(null)
     setVodChaptersLoaded(false)
+    setAvailableQualities(undefined)
+    setCurrentQuality('best')
+    setQualityPanelOpen(false)
     void loadChapters(vod.id)
       .then((loaded) => { setChapters(loaded); setVodChaptersLoaded(true) })
       .catch(() => { setVodChaptersLoaded(true) })
@@ -388,14 +437,15 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     } catch (e) {
       setPlayState('error')
       setErrorMsg(String(e))
+      return
     }
+    window.t4sd.playback.getQualities(`twitch.tv/videos/${vod.id}`)
+      .then((qs) => setAvailableQualities(qs.length > 0 ? qs : []))
+      .catch(() => setAvailableQualities([]))
   }
 
   const openChapterPanel = (vod: VodInfo, duringPlayback: boolean): void => {
     if (duringPlayback) {
-      videoRef.current?.pause()
-      setWasPlayingBeforeChapters(playState === 'playing')
-      setPlayState('paused')
       setChapterPanelVod(vod)
       setChapters([])
       setChapterIndex(0)
@@ -415,10 +465,12 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     setErrorMsg('')
     setFocusRegion('hero')
     setChapterPanelVod(null)
-    setWasPlayingBeforeChapters(false)
     setCurrentVod(vod)
     setPendingChapterVod(null)
     setVodChaptersLoaded(false)
+    setAvailableQualities(undefined)
+    setCurrentQuality('best')
+    setQualityPanelOpen(false)
     void loadChapters(vod.id)
       .then((loaded) => { setChapters(loaded); setVodChaptersLoaded(true) })
       .catch(() => { setVodChaptersLoaded(true) })
@@ -433,14 +485,54 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
     } catch (e) {
       setPlayState('error')
       setErrorMsg(String(e))
+      return
     }
+    window.t4sd.playback.getQualities(`twitch.tv/videos/${vod.id}`)
+      .then((qs) => setAvailableQualities(qs.length > 0 ? qs : []))
+      .catch(() => setAvailableQualities([]))
   }
 
   const handleStop = async (): Promise<void> => {
     videoRef.current?.stop()
+    setAvailableQualities(undefined)
+    setCurrentQuality('best')
+    setQualityPanelOpen(false)
     await window.t4sd.playback.stop()
   }
 
+  const handleQualityChange = async (quality: string): Promise<void> => {
+    setQualityPanelOpen(false)
+    setCurrentQuality(quality)
+    setAvailableQualities(undefined)
+    const currentPos = videoRef.current?.getCurrentTime() ?? 0
+    videoRef.current?.stop()
+    setHlsPayload(null)
+    setPlayState('starting')
+    try {
+      if (isLivePlayback) {
+        await window.t4sd.playback.startLive(channel.broadcasterLogin, quality)
+        window.t4sd.playback.getQualities(`twitch.tv/${channel.broadcasterLogin}`)
+          .then((qs) => setAvailableQualities(qs.length > 0 ? qs : []))
+          .catch(() => setAvailableQualities([]))
+      } else if (currentVod) {
+        await window.t4sd.playback.startVod(
+          currentVod.id,
+          channel.broadcasterLogin,
+          currentVod.title,
+          currentVod.durationSeconds,
+          currentPos,
+          quality
+        )
+        window.t4sd.playback.getQualities(`twitch.tv/videos/${currentVod.id}`)
+          .then((qs) => setAvailableQualities(qs.length > 0 ? qs : []))
+          .catch(() => setAvailableQualities([]))
+      }
+    } catch (e) {
+      setPlayState('error')
+      setErrorMsg(String(e))
+    }
+  }
+
   const thumb = resolveThumbnail(channel.thumbnailUrl)
   const trackOffset = shelfIndex * (CARD_W + CARD_GAP)
   const isActivePlayback = playState === 'playing' || playState === 'paused'
@@ -597,6 +689,13 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
                     <p className="channel-screen__vod-title">{vod.title}</p>
                     <p className="channel-screen__vod-meta">
                       {formatDate(vod.createdAt)}
+                      {vod.viewCount > 0 && (
+                        <span className="channel-screen__vod-views">
+                          {' · '}
+                          <EyeIcon width={11} height={11} />
+                          {' '}{formatCount(vod.viewCount)}
+                        </span>
+                      )}
                       {prog && !prog.completed && (
                         <span className="channel-screen__vod-watched">
                           {' · '}{formatWatchedAt(prog.watchedAt)}
@@ -627,13 +726,21 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
             </p>
             {chaptersLoading && <p className="chapter-overlay__msg">Lade Kapitel…</p>}
             {!chaptersLoading && chapters.length === 0 && (
-              <p className="chapter-overlay__msg">
-                Keine Kapitel gefunden.{' '}
+              <div className="chapter-overlay__msg">
+                <p>Keine Kapitel gefunden.</p>
+                <p>
                   {isActivePlayback ? (
+                    <>
                       <span className="gamepad-inline-action">
                         <GamepadPrompt prompt="a" />
                         <span>zum Fortsetzen.</span>
                       </span>
+                      {' · '}
+                      <span className="gamepad-inline-action">
+                        <GamepadPrompt prompt="x" />
+                        <span>zum Anfang springen.</span>
+                      </span>
+                    </>
                   ) : (
                     <span className="gamepad-inline-action">
                       <GamepadPrompt prompt="a" />
@@ -641,6 +748,7 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
                     </span>
                   )}
                 </p>
+              </div>
             )}
             {chapters.length > 0 && (
               <ul className="chapter-overlay__list" ref={chapterListRef}>
@@ -681,8 +789,8 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
         />
       )}
 
-      {/* Player overlay – shown during VOD/Live playback */}
-      {isActivePlayback && (
+      {/* Player overlay – shown during VOD/Live playback, hidden while chapter panel is open */}
+      {isActivePlayback && !chapterPanelVod && (
         <PlaybackOverlay
           playState={playState}
           durationSeconds={vodDuration}
@@ -694,6 +802,21 @@ export default function ChannelScreen({ channel, onBack }: Props): JSX.Element {
           viewerCount={isLivePlayback ? (channel.viewerCount ?? undefined) : undefined}
           viewCount={!isLivePlayback ? (currentVod?.viewCount ?? undefined) : undefined}
           gameName={isLivePlayback ? (channel.gameName ?? undefined) : currentChapterName}
+          currentChapterIndex={currentChapterIndex}
+          totalChapters={vodChaptersLoaded && chapters.length > 0 ? chapters.length : undefined}
+          availableQualities={availableQualities}
+          currentQuality={currentQuality}
+          qualityPanelOpen={qualityPanelOpen}
+          qualityFocusedIndex={qualityFocusedIndex}
+          onOpenQuality={() => {
+            const idx = availableQualities?.indexOf(currentQuality) ?? 0
+            setQualityFocusedIndex(idx >= 0 ? idx : 0)
+            setQualityPanelOpen(true)
+          }}
+          onChangeQuality={(q) => void handleQualityChange(q)}
+          onOpenChapters={!isLivePlayback && currentVod
+            ? () => openChapterPanel(currentVod, true)
+            : undefined}
           onTogglePause={() => {
             if (playState === 'playing') {
               void window.t4sd.playback.pause()

src/renderer/src/screens/SettingsScreen.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from 'react'
+import { useCallback, useEffect, useRef, useState } from 'react'
 import { GamepadHintItem, GamepadPrompt } from '../components/GamepadPrompt'
 import { SettingsIcon } from '../components/Icons'
 import {
@@ -9,7 +9,7 @@ import {
   SIDEBAR_DEFAULT,
   BADGE_GAP_MIN,
   BADGE_GAP_MAX,
-  BADGE_GAP_DEFAULT
+  BADGE_GAP_DEFAULT,
 } from '../context/SettingsContext'
 
 interface Props {
@@ -33,17 +33,65 @@ const OPTIONS: Option[] = [
 const SIDEBAR_STEP = 10
 const BADGE_GAP_STEP = 2
 
-/** Total focusable rows: badge options + sidebar slider + badge gap slider */
+const MB = 1024 * 1024
+const CACHE_THRESHOLD_UNUSUAL = 500 * MB
+const CACHE_THRESHOLD_HIGH = 1024 * MB
+
+type CacheStatus = 'normal' | 'unusual' | 'high'
+
+function formatCacheSize(bytes: number): string {
+  if (bytes < MB) return `${(bytes / 1024).toFixed(0)} KB`
+  const mb = bytes / MB
+  if (mb < 1000) return `${mb.toFixed(0)} MB`
+  return `${(mb / 1024).toFixed(2)} GB`
+}
+
+function classifyCache(bytes: number): { status: CacheStatus; label: string } {
+  if (bytes >= CACHE_THRESHOLD_HIGH) return { status: 'high', label: 'Leeren empfohlen' }
+  if (bytes >= CACHE_THRESHOLD_UNUSUAL) return { status: 'unusual', label: 'Ungewöhnlich groß' }
+  return { status: 'normal', label: 'Normal' }
+}
+
+/** Total focusable rows: badge options + sidebar slider + badge gap slider + hls toggle + cache action */
 const SIDEBAR_SLIDER_ROW = OPTIONS.length
 const BADGE_GAP_SLIDER_ROW = OPTIONS.length + 1
-const TOTAL_ROWS = OPTIONS.length + 2
+const HLS_CACHE_TOGGLE_ROW = OPTIONS.length + 2
+const CACHE_ACTION_ROW = OPTIONS.length + 3
+const TOTAL_ROWS = OPTIONS.length + 4
 
 export default function SettingsScreen({ hasFocus, onRequestSidebar }: Props): JSX.Element {
-  const { settings, setStreamBadgeMode, setSidebarWidth, setBadgeGap } = useSettings()
+  const { settings, setStreamBadgeMode, setSidebarWidth, setBadgeGap, setHlsCacheEnabled } = useSettings()
   const [focusedIndex, setFocusedIndex] = useState(() =>
     Math.max(0, OPTIONS.findIndex((o) => o.mode === settings.streamBadgeMode))
   )
 
+  const [cacheSize, setCacheSize] = useState<number | null>(null)
+  const [clearing, setClearing] = useState(false)
+
+  const refreshCacheSize = useCallback(async (): Promise<void> => {
+    try {
+      const size = await window.t4sd.app.getCacheSize()
+      setCacheSize(size)
+    } catch {
+      setCacheSize(null)
+    }
+  }, [])
+
+  useEffect(() => {
+    void refreshCacheSize()
+  }, [refreshCacheSize])
+
+  const handleClearCache = useCallback(async (): Promise<void> => {
+    if (clearing) return
+    setClearing(true)
+    try {
+      await window.t4sd.app.clearCache()
+      await refreshCacheSize()
+    } finally {
+      setClearing(false)
+    }
+  }, [clearing, refreshCacheSize])
+
   useEffect(() => {
     if (!hasFocus) return
     const onKey = (e: KeyboardEvent): void => {
@@ -88,6 +136,10 @@ export default function SettingsScreen({ hasFocus, onRequestSidebar }: Props): J
             setSidebarWidth(SIDEBAR_DEFAULT)
           } else if (focusedIndex === BADGE_GAP_SLIDER_ROW) {
             setBadgeGap(BADGE_GAP_DEFAULT)
+          } else if (focusedIndex === HLS_CACHE_TOGGLE_ROW) {
+            setHlsCacheEnabled(!settings.hlsCacheEnabled)
+          } else if (focusedIndex === CACHE_ACTION_ROW) {
+            void handleClearCache()
           }
           break
         }
@@ -95,7 +147,7 @@ export default function SettingsScreen({ hasFocus, onRequestSidebar }: Props): J
     }
     window.addEventListener('keydown', onKey)
     return () => window.removeEventListener('keydown', onKey)
-  }, [hasFocus, focusedIndex, settings.sidebarWidth, settings.badgeGap, onRequestSidebar, setStreamBadgeMode, setSidebarWidth, setBadgeGap])
+  }, [hasFocus, focusedIndex, settings.sidebarWidth, settings.badgeGap, settings.hlsCacheEnabled, onRequestSidebar, setStreamBadgeMode, setSidebarWidth, setBadgeGap, setHlsCacheEnabled, handleClearCache])
 
   const rowRefs = useRef<Array<HTMLElement | null>>([])
 
@@ -107,6 +159,10 @@ export default function SettingsScreen({ hasFocus, onRequestSidebar }: Props): J
 
   const sidebarSliderFocused = hasFocus && focusedIndex === SIDEBAR_SLIDER_ROW
   const badgeGapSliderFocused = hasFocus && focusedIndex === BADGE_GAP_SLIDER_ROW
+  const hlsCacheToggleFocused = hasFocus && focusedIndex === HLS_CACHE_TOGGLE_ROW
+  const cacheActionFocused = hasFocus && focusedIndex === CACHE_ACTION_ROW
+
+  const cacheClassification = cacheSize !== null ? classifyCache(cacheSize) : null
 
   return (
     <div className="screen settings-screen">
@@ -226,6 +282,68 @@ export default function SettingsScreen({ hasFocus, onRequestSidebar }: Props): J
         </div>
       </div>
 
+      <div className="settings-section">
+        <h3 className="settings-section__title">Speicher</h3>
+        <p className="settings-section__hint">
+          HLS-Segmente (Live &amp; VODs) sind Single-Use — sie werden nach dem Abspielen nie
+          wieder abgerufen. Caching erzeugt auf dem Steam Deck unnötiges Disk-Wachstum und
+          Akku-Belastung. Thumbnails und API-Antworten bleiben immer gecacht.
+          Cache-Größe: Normal unter 500 MB · ungewöhnlich ab 500 MB · Leeren empfohlen ab 1 GB.
+        </p>
+
+        <button
+          ref={(el) => { rowRefs.current[HLS_CACHE_TOGGLE_ROW] = el }}
+          className={[
+            'settings-option',
+            settings.hlsCacheEnabled ? 'settings-option--active' : '',
+            hlsCacheToggleFocused ? 'settings-option--focused' : ''
+          ].filter(Boolean).join(' ')}
+          onClick={() => {
+            setFocusedIndex(HLS_CACHE_TOGGLE_ROW)
+            setHlsCacheEnabled(!settings.hlsCacheEnabled)
+          }}
+          tabIndex={hlsCacheToggleFocused ? 0 : -1}
+        >
+          <span className="settings-option__radio" aria-hidden="true">
+            {settings.hlsCacheEnabled ? '●' : '○'}
+          </span>
+          <span className="settings-option__label">HLS-Cache (Live &amp; VODs)</span>
+          <span className="settings-option__preview">
+            {settings.hlsCacheEnabled
+              ? 'Aktiv — Segmente werden gecacht'
+              : 'Inaktiv — kein Disk-Wachstum (empfohlen)'}
+          </span>
+        </button>
+
+        <button
+          ref={(el) => { rowRefs.current[CACHE_ACTION_ROW] = el }}
+          className={[
+            'settings-cache',
+            cacheActionFocused ? 'settings-cache--focused' : ''
+          ].filter(Boolean).join(' ')}
+          onClick={() => {
+            setFocusedIndex(CACHE_ACTION_ROW)
+            void handleClearCache()
+          }}
+          disabled={clearing}
+          tabIndex={cacheActionFocused ? 0 : -1}
+        >
+          <span className="settings-cache__info">
+            <span className="settings-cache__size">
+              {cacheSize === null ? '…' : formatCacheSize(cacheSize)}
+            </span>
+            {cacheClassification && (
+              <span className={`settings-cache__pill settings-cache__pill--${cacheClassification.status}`}>
+                {cacheClassification.label}
+              </span>
+            )}
+          </span>
+          <span className="settings-cache__action">
+            {clearing ? 'Wird geleert …' : 'Cache leeren'}
+          </span>
+        </button>
+      </div>
+
       {!hasFocus && (
         <div className="screen__state" style={{ flex: 0 }}>
           <SettingsIcon style={{ width: 48, height: 48, opacity: 0.2 }} />

src/renderer/src/styles/global.css

@@ -874,6 +874,13 @@ body,
   color: var(--color-accent);
 }
 
+.channel-screen__vod-views {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  color: var(--color-muted);
+}
+
 .channel-screen__vod-completed {
   position: absolute;
   inset: 0;
@@ -1299,6 +1306,80 @@ body,
   white-space: nowrap;
 }
 
+/* ── Settings Cache ──────────────────────────────── */
+.settings-cache {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 20px;
+  padding: 16px 20px;
+  border-radius: var(--radius);
+  background: var(--color-bg-elev);
+  border: 2px solid transparent;
+  color: var(--color-fg);
+  font: inherit;
+  cursor: pointer;
+  text-align: left;
+  margin-top: 8px;
+  transition: background 0.1s, border-color 0.1s, opacity 0.1s;
+}
+
+.settings-cache:hover:not(:disabled) {
+  background: var(--color-bg-elev2);
+}
+
+.settings-cache:disabled {
+  cursor: default;
+  opacity: 0.6;
+}
+
+.settings-cache--focused {
+  border-color: var(--color-focus);
+  box-shadow: 0 0 0 2px rgba(191, 148, 255, 0.25);
+}
+
+.settings-cache__info {
+  display: flex;
+  align-items: center;
+  gap: 14px;
+}
+
+.settings-cache__size {
+  font-size: 22px;
+  font-weight: 700;
+  color: var(--color-fg);
+  min-width: 90px;
+}
+
+.settings-cache__pill {
+  font-size: 14px;
+  font-weight: 600;
+  padding: 4px 10px;
+  border-radius: 999px;
+  letter-spacing: 0.01em;
+}
+
+.settings-cache__pill--normal {
+  background: rgba(255, 255, 255, 0.08);
+  color: var(--color-fg-dim);
+}
+
+.settings-cache__pill--unusual {
+  background: rgba(255, 184, 60, 0.18);
+  color: #ffc56b;
+}
+
+.settings-cache__pill--high {
+  background: rgba(255, 95, 95, 0.18);
+  color: #ff8585;
+}
+
+.settings-cache__action {
+  font-size: 16px;
+  font-weight: 600;
+  color: var(--color-accent);
+}
+
 .settings-screen {
   overflow-y: auto;
 }
@@ -1845,12 +1926,75 @@ body,
   padding: 2px 8px;
 }
 
+.playback-overlay__chapter-badge {
+  margin-left: 6px;
+  padding: 1px 6px;
+  border-radius: 4px;
+  background: #007aff;
+  font-size: 11px;
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  color: #fff;
+}
+
 /* Stop button */
-.playback-overlay__stop-btn {
+.playback-overlay__action-row {
   align-self: flex-end;
   display: flex;
   align-items: center;
   gap: 8px;
+}
+
+.playback-overlay__chapter-btn-wrap {
+  position: relative;
+  display: inline-flex;
+}
+
+.playback-overlay__chapter-btn {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 10px 20px;
+  border-radius: var(--radius-sm);
+  background: rgba(255, 255, 255, 0.12);
+  border: 1px solid rgba(255, 255, 255, 0.18);
+  color: rgba(255, 255, 255, 0.85);
+  font-size: 16px;
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+  min-height: 44px;
+}
+
+.playback-overlay__chapter-btn:hover,
+.playback-overlay__chapter-btn:focus-visible {
+  background: rgba(145, 71, 255, 0.35);
+  border-color: var(--color-accent);
+  outline: none;
+}
+
+.playback-overlay__chapter-ios-badge {
+  position: absolute;
+  top: -7px;
+  right: -7px;
+  min-width: 20px;
+  height: 20px;
+  padding: 0 5px;
+  border-radius: 10px;
+  background: #007aff;
+  color: #fff;
+  font-size: 11px;
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  line-height: 20px;
+  text-align: center;
+  pointer-events: none;
+  border: 2px solid rgba(0, 0, 0, 0.55);
+}
+
+.playback-overlay__stop-btn {
+  display: flex;
+  align-items: center;
+  gap: 8px;
   padding: 10px 20px;
   border-radius: var(--radius-sm);
   background: rgba(255, 255, 255, 0.12);
@@ -1896,3 +2040,91 @@ body,
   60% { opacity: 0.9; transform: translateY(calc(-50% - 12px)); }
   100% { opacity: 0; transform: translateY(calc(-50% - 24px)); }
 }
+
+/* ── Quality Button & Panel ───────────────────────────────────────────────── */
+
+.playback-overlay__quality-wrap {
+  position: relative;
+  display: inline-flex;
+}
+
+.playback-overlay__quality-btn {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 10px 20px;
+  border-radius: var(--radius-sm);
+  background: rgba(255, 255, 255, 0.12);
+  border: 1px solid rgba(255, 255, 255, 0.18);
+  color: rgba(255, 255, 255, 0.85);
+  font-size: 16px;
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+  min-height: 44px;
+}
+
+.playback-overlay__quality-btn:hover,
+.playback-overlay__quality-btn:focus-visible {
+  background: rgba(145, 71, 255, 0.35);
+  border-color: var(--color-accent);
+  outline: none;
+}
+
+.playback-overlay__quality-panel {
+  position: absolute;
+  bottom: calc(100% + 10px);
+  left: 0;
+  min-width: 160px;
+  background: rgba(14, 14, 16, 0.96);
+  border: 1px solid rgba(255, 255, 255, 0.15);
+  border-radius: var(--radius-sm);
+  backdrop-filter: blur(12px);
+  overflow: hidden;
+  z-index: 10;
+}
+
+.playback-overlay__quality-panel-title {
+  padding: 10px 16px 6px;
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--color-fg-dim);
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+}
+
+.playback-overlay__quality-list {
+  list-style: none;
+  margin: 0;
+  padding: 0 0 6px;
+}
+
+.playback-overlay__quality-item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 10px 16px;
+  font-size: 16px;
+  color: rgba(255, 255, 255, 0.85);
+  cursor: pointer;
+  transition: background 0.12s;
+}
+
+.playback-overlay__quality-item:hover {
+  background: rgba(255, 255, 255, 0.08);
+}
+
+.playback-overlay__quality-item--focused {
+  background: rgba(145, 71, 255, 0.3);
+  color: #fff;
+}
+
+.playback-overlay__quality-item--active {
+  color: var(--color-focus);
+  font-weight: 600;
+}
+
+.playback-overlay__quality-check {
+  color: var(--color-accent);
+  font-size: 14px;
+  margin-left: 8px;
+}

src/renderer/src/types/t4sd.d.ts

@@ -91,6 +91,9 @@ export interface T4sdApi {
   appVersion: string
   app: {
     quit: () => Promise<void>
+    getCacheSize: () => Promise<number>
+    clearCache: () => Promise<void>
+    setHlsCacheEnabled: (enabled: boolean) => Promise<void>
   }
   auth: {
     isConfigured: () => Promise<boolean>
@@ -113,7 +116,8 @@ export interface T4sdApi {
   }
   playback: {
     startLive: (channelLogin: string, quality?: string) => Promise<void>
-    startVod: (vodId: string, channelLogin: string, title: string, durationSeconds: number, startSeconds?: number) => Promise<void>
+    startVod: (vodId: string, channelLogin: string, title: string, durationSeconds: number, startSeconds?: number, quality?: string) => Promise<void>
+    getQualities: (twitchUrl: string) => Promise<string[]>
     stop: () => Promise<void>
     pause: () => Promise<void>
     reportPosition: (vodId: string, positionSeconds: number, durationSeconds: number) => Promise<void>