Fix versuch: Seeking und Resume von VODs ohne Kapitel

streamlink.ts — 3 neue mpv-Argumente für VODs
  - --demuxer-max-bytes=150M / --demuxer-max-back-bytes=75M — größerer Buffer, verhindert Flush bei Seeks
  - --hr-seek=no — Keyframe-only Seeks, zuverlässiger für HLS
  mpvController.ts — 2 Änderungen                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       - Relative Seeks jetzt relative+keyframes (statt relative) — konsistent mit seekAbsolute                                                                                                                                                                                                   - Neue pollTimePos()-Methode als Fallback wenn observe_property nicht feuert
  playbackService.ts — Kerndfix

  - playback-restart statt file-loaded für den initialen Resume-Seek — wartet bis der erste Frame dekodiert ist, statt nur auf das Manifest
  - Seek-Verify nach 5s — prüft ob der Seek geklappt hat, Retry falls nicht
  - Poll-Fallback nach 10s — startet Polling falls time-pos nie über observe_property kommt
  - Cleanup in stop() für die neuen Timer/Callbacks

src/main/playback/playbackService.ts

@@ -10,8 +10,15 @@ const POSITION_WRITE_INTERVAL_MS = 5_000
 interface CurrentPlayback {
   process: ChildProcess
   mpv: MpvController
+  pendingRelativeSeekSeconds: number
+  pendingAbsoluteSeekSeconds: number | null
+  seekFlushTimer: NodeJS.Timeout | null
+  seekVerifyTimer?: NodeJS.Timeout | null
+  stopPolling?: (() => void) | null
 }
 
+const SEEK_FLUSH_DELAY_MS = 180
+
 export class PlaybackService extends EventEmitter {
   private current: CurrentPlayback | null = null
   private readonly ipcPath = getMpvIpcPath()
@@ -56,7 +63,13 @@ export class PlaybackService extends EventEmitter {
 
     // Für Live: mpv wird von streamlink gestartet, kein direkter IPC nötig
     const mpv = new MpvController(this.ipcPath)
-    this.current = { process: proc, mpv }
+    this.current = {
+      process: proc,
+      mpv,
+      pendingRelativeSeekSeconds: 0,
+      pendingAbsoluteSeekSeconds: null,
+      seekFlushTimer: null
+    }
     this.emit('playback-event', { kind: 'started', channelLogin } satisfies PlaybackEvent)
   }
 
@@ -90,7 +103,7 @@ export class PlaybackService extends EventEmitter {
     }
 
     const effectiveStart = startSeconds !== undefined ? startSeconds : resumePos
-    const proc = spawnMpv(hlsUrl, { ipcPath: this.ipcPath })
+    const proc = spawnMpv(hlsUrl, { ipcPath: this.ipcPath, isVod: true })
 
     let mpvStderrBuf = ''
     proc.stdout?.on('data', (d: Buffer) => console.log('[mpv]', d.toString().trim()))
@@ -122,7 +135,13 @@ export class PlaybackService extends EventEmitter {
     })
 
     const mpv = new MpvController(this.ipcPath)
-    this.current = { process: proc, mpv }
+    this.current = {
+      process: proc,
+      mpv,
+      pendingRelativeSeekSeconds: 0,
+      pendingAbsoluteSeekSeconds: null,
+      seekFlushTimer: null
+    }
     this.emit('playback-event', { kind: 'started' } satisfies PlaybackEvent)
 
     // IPC verbinden, initialen Resume-Seek erst nach `file-loaded` setzen und Position tracken.
@@ -130,14 +149,29 @@ export class PlaybackService extends EventEmitter {
     // als auf `mpv --start=<sek>`.
     mpv.connect().then(() => {
       let initialSeekDone = effectiveStart <= 0
-      mpv.onEvent('file-loaded', () => {
+
+      // playback-restart feuert nach dem ersten dekodierten Frame —
+      // sicherer als file-loaded, weil der HLS-Demuxer dann bereit ist.
+      mpv.onEvent('playback-restart', () => {
         if (initialSeekDone) return
         initialSeekDone = true
         mpv.seekAbsolute(effectiveStart)
+
+        // Nach 5s prüfen ob der Seek geklappt hat, sonst Retry
+        const verifyTimer = setTimeout(async () => {
+          if (this.current) this.current.seekVerifyTimer = null
+          const pos = await mpv.getTimePos()
+          if (pos !== null && effectiveStart > 30 && Math.abs(pos - effectiveStart) > 30) {
+            console.warn(`[mpv] Seek verify: at ${pos}, expected ~${effectiveStart}. Retry.`)
+            mpv.seekAbsolute(effectiveStart)
+          }
+        }, 5000)
+        if (this.current) this.current.seekVerifyTimer = verifyTimer
       })
 
+      // Position-Tracking
       let lastWrite = 0
-      mpv.observeTimePos((seconds) => {
+      const writePosition = (seconds: number): void => {
         const now = Date.now()
         if (now - lastWrite < POSITION_WRITE_INTERVAL_MS) return
         lastWrite = now
@@ -146,14 +180,28 @@ export class PlaybackService extends EventEmitter {
         if (durationSeconds > 0 && pos / durationSeconds > 0.95) {
           history.markCompleted(vodId)
         }
-      })
+      }
+
+      mpv.observeTimePos(writePosition)
+
+      // Fallback: Falls observe_property nie feuert, nach 10s auf Polling wechseln
+      setTimeout(() => {
+        if (lastWrite === 0 && this.current?.mpv === mpv) {
+          console.warn('[mpv] observe_property time-pos nicht aktiv, starte Poll-Fallback')
+          const stop = mpv.pollTimePos(POSITION_WRITE_INTERVAL_MS, writePosition)
+          if (this.current) this.current.stopPolling = stop
+        }
+      }, 10_000)
     }).catch(() => {
       console.warn('[mpv] IPC nicht verfügbar — Resume-Tracking deaktiviert')
     })
   }
 
   seek(seconds: number): void {
-    this.current?.mpv.seek(seconds)
+    if (!this.current) return
+    this.current.pendingRelativeSeekSeconds += seconds
+    this.current.pendingAbsoluteSeekSeconds = null
+    this.scheduleSeekFlush()
   }
 
   togglePause(): void {
@@ -169,7 +217,10 @@ export class PlaybackService extends EventEmitter {
   }
 
   seekTo(seconds: number): void {
-    this.current?.mpv.seekAbsolute(seconds)
+    if (!this.current) return
+    this.current.pendingRelativeSeekSeconds = 0
+    this.current.pendingAbsoluteSeekSeconds = seconds
+    this.scheduleSeekFlush()
   }
 
   getCurrentPosition(): Promise<number | null> {
@@ -178,9 +229,12 @@ export class PlaybackService extends EventEmitter {
 
   async stop(): Promise<void> {
     if (!this.current) return
-    const { process: proc, mpv } = this.current
+    const { process: proc, mpv, seekFlushTimer, seekVerifyTimer, stopPolling } = this.current
     this.current = null
 
+    if (seekFlushTimer) clearTimeout(seekFlushTimer)
+    if (seekVerifyTimer) clearTimeout(seekVerifyTimer)
+    if (stopPolling) stopPolling()
     try { mpv.quit() } catch { /* ignore */ }
     mpv.disconnect()
 
@@ -192,4 +246,29 @@ export class PlaybackService extends EventEmitter {
     this.stop().catch(() => {})
   }
 
+  private scheduleSeekFlush(): void {
+    if (!this.current) return
+    if (this.current.seekFlushTimer) {
+      clearTimeout(this.current.seekFlushTimer)
+    }
+
+    this.current.seekFlushTimer = setTimeout(() => {
+      if (!this.current) return
+      this.current.seekFlushTimer = null
+
+      const absoluteSeek = this.current.pendingAbsoluteSeekSeconds
+      if (absoluteSeek !== null) {
+        this.current.pendingAbsoluteSeekSeconds = null
+        this.current.mpv.seekAbsolute(absoluteSeek)
+        return
+      }
+
+      const relativeSeek = this.current.pendingRelativeSeekSeconds
+      this.current.pendingRelativeSeekSeconds = 0
+      if (relativeSeek !== 0) {
+        this.current.mpv.seek(relativeSeek)
+      }
+    }, SEEK_FLUSH_DELAY_MS)
+  }
+
 }