Adding media items to a playlist during playback do not always get played

Version

Media3 1.9.0

More version details

No response

Devices that reproduce the issue

Pixel 8 running Android 16

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Not tested

Reproduction steps

Have a player add media items when the player transitions to a new media item.

    private val listener = object : Player.Listener {

        override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
            super.onMediaItemTransition(mediaItem, reason)
            scope.launch(Dispatchers.Main.immediate) {
                if (reason == MEDIA_ITEM_TRANSITION_REASON_AUTO) {
                    val song = getNextSong(playlistProvider.await())
                    addMediaItem(song)
                }
            }
        }

    }

    init {
        addListener(listener)
        prepare()
    }

Set a media item, add 1 or more media items, and start playback. The media items added on transitions will mot always play. It may be because the media items I am testing with are of very short audio files.

I am wondering if this is a race condition.

Expected result

All media items added to the playlist via addMediaItem during transitions get added to the playlist and played when the previous media item finishes.

Actual result

All media items added to the playlist via addMediaItem during transitions get added to the playlist and played when the previous media item finishes only some of the time, and eventually, the playback will just stop.

Media

I will email the media.

Bug Report

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