Preload Manager intermittent crash when devices is offline

[JosephSanjaya]

Version

Media3 1.4.0

More version details

No response

Devices that reproduce the issue

Emulator Android running android 11 - 15

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Yes

Reproduction steps

• Intermittent

1. Load any first video
2. Make devices offline
3. scroll to second video
4. Crash

Expected result

When device is offline, video should loaded from memory without any crash

Actual result

Playback crash with following stacktraces:

2024-07-29 10:28:11.206  7605-8770  AndroidRuntime                        E  FATAL EXCEPTION: ExoPlayer:Playback
                                                                                                    Process: com.vidio.android.debug, PID: 7605
                                                                                                    java.lang.IllegalStateException
                                                                                                    	at androidx.media3.common.util.Assertions.checkState(Assertions.java:85)
                                                                                                    	at androidx.media3.exoplayer.upstream.Loader$LoadTask.start(Loader.java:367)
                                                                                                    	at androidx.media3.exoplayer.upstream.Loader$LoadTask.handleMessage(Loader.java:505)
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:107)
                                                                                                    	at android.os.Looper.loop(Looper.java:214)
                                                                                                    	at android.os.HandlerThread.run(HandlerThread.java:67)
2024-07-29 10:28:11.230  7605-8770  Uncaught Exception                    E  null
                                                                                                    java.lang.IllegalStateException
                                                                                                    	at androidx.media3.common.util.Assertions.checkState(Assertions.java:85)
                                                                                                    	at androidx.media3.exoplayer.upstream.Loader$LoadTask.start(Loader.java:367)
                                                                                                    	at androidx.media3.exoplayer.upstream.Loader$LoadTask.handleMessage(Loader.java:505)
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:107)
                                                                                                    	at android.os.Looper.loop(Looper.java:214)
                                                                                                    	at android.os.HandlerThread.run(HandlerThread.java:67)

Media

Not applicable

Bug Report

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

[tianyif]

Hi @JosephSanjaya,

Thanks for your feedback on the preload manager! Please allow me to clarify more details:

• How frequently did see this issue on the demo-shortform app?
• If you tried DefaultPreloadManager in your app, what preloadLooper did you inject? Is it the same looper that is injected as playbackLooper to the ExoPlayer?

Looking forward your reply!

[JosephSanjaya]

Hi @tianyif , thanks for fast response

Issue Frequency: I have encountered the issue once in shortform demo, but its really rare in the demo.

PreloadLooper: In our app, we’re using the same looper for the preload manager as the one injected for the ExoPlayer’s playbackLooper.

Looking forward to any further insights you might have!

[tianyif]

Hi @JosephSanjaya,

Thanks for the feedback! Could you please also specify what media (DASH, HLS, and etc.) your app is preloading / playing when you saw this issue?

[JosephSanjaya]

Hello @tianyif, we are using HLS media and DASH for DRM Short