Error when playing SmoothStreaming with subtitles

[marekl-ag]

Version

Media3 1.4.1

More version details

No response

Devices that reproduce the issue

AndroidTV STB with AndroidTV 12

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Yes

Reproduction steps

Play SmoothStreaming media with subtitles in demo application.

Problem exists only in case of extraction phase subtitle parsing path - which is now default.
SmoothStreaming media source (DefaultSsChunkSource) uses FragmentedMp4Extractor with non-null sideloadedTrack which seems to be incorrecly handled in FragmentedMp4Extractor.init() which in turn causes subtitles to be decoded by CueDecoder without being first encoded.

Following change causes stream to play correctly:

diff --git a/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/FragmentedMp4Extractor.java b/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/FragmentedMp4Extractor.java
--- a/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/FragmentedMp4Extractor.java	
+++ b/libraries/extractor/src/main/java/androidx/media3/extractor/mp4/FragmentedMp4Extractor.java	(date 1728030664226)
@@ -417,7 +417,7 @@
     if (sideloadedTrack != null) {
       TrackBundle bundle =
           new TrackBundle(
-              output.track(0, sideloadedTrack.type),
+              extractorOutput.track(0, sideloadedTrack.type),
               new TrackSampleTable(
                   sideloadedTrack,
                   /* offsets= */ new long[0],

Expected result

Media plays with subtitles rendered

Actual result

Playback error with following exception:

  playerFailed [eventTime=1.12, mediaPos=0.00, window=0, period=0, errorCode=ERROR_CODE_FAILED_RUNTIME_CHECK
    androidx.media3.exoplayer.ExoPlaybackException: Unexpected runtime error
      at androidx.media3.exoplayer.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:720)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loopOnce(Looper.java:201)
      at android.os.Looper.loop(Looper.java:288)
      at android.os.HandlerThread.run(HandlerThread.java:67)
    Caused by: java.lang.IllegalStateException: Bad magic number for Bundle: 0x6576206c
      at android.os.BaseBundle.readFromParcelInner(BaseBundle.java:1659)
      at android.os.BaseBundle.<init>(BaseBundle.java:143)
      at android.os.Bundle.<init>(Bundle.java:96)
      at android.os.Parcel.readBundle(Parcel.java:2658)
      at androidx.media3.extractor.text.CueDecoder.decode(CueDecoder.java:63)
      at androidx.media3.exoplayer.text.TextRenderer.readAndDecodeCuesWithTiming(TextRenderer.java:336)
      at androidx.media3.exoplayer.text.TextRenderer.renderFromCuesWithTiming(TextRenderer.java:295)
      at androidx.media3.exoplayer.text.TextRenderer.render(TextRenderer.java:263)
      at androidx.media3.exoplayer.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:1136)
      at androidx.media3.exoplayer.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:561)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loopOnce(Looper.java:201)
      at android.os.Looper.loop(Looper.java:288)
      at android.os.HandlerThread.run(HandlerThread.java:67)

Media

https://demo.unified-streaming.com/k8s/features/stable/video/tears-of-steel/tears-of-steel-multiple-subtitles.ism/Manifest

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.

[icbaker]

Thanks for the report and the suggested fix, it looks like this 'direct' usage of the output parameter was missed in da724c8 - I'll send a fix internally and it will be linked here when it's published.