CompositionPlayer fails to play overlapped EditedMediaItemSequence items

Version

Media3 pre-release (alpha, beta or RC not in this list)

More version details

Version 1.9.0-alpha01

Devices that reproduce the issue

• Pixel 7 Pro running Android 16
• Samsung S10 running Android 12

Devices that do not reproduce the issue

None found

Reproducible in the demo app?

Not tested

Reproduction steps

Attempt to create a cross over video fade effect...

1. Create a list of EditedMediaItemSequence which have one media item each. Have each EditedMediaItemSequence cross over by adding gaps at the start and end to pad out the spacing.

const val CROSS_OVER_MS = 1000L
const val US_PER_MS = 1000L

fun buildComposition(context: Context, uris: List<Uri>): Composition {
    val durationsMs = uris.map {
        getVideoDurationMs(context, it)
    }
    val startTimesMs = durationsMs.mapIndexed { index, duration ->
        durationsMs.take(index).sum() - (index * CROSS_OVER_MS)
    }
    val totalMs = startTimesMs.last() + durationsMs.last()
    val sequences = uris.mapIndexed { index, uri ->
        val durationMs = durationsMs[index]
        val startGapMs = startTimesMs[index]
        val endGapMs = totalMs - startGapMs - durationMs
        val mediaItem = MediaItem.fromUri(uri)
        val editedMediaItem = EditedMediaItem.Builder(mediaItem)
            .setDurationUs(durationMs * US_PER_MS)
            .setFrameRate(30)
            .build()

        EditedMediaItemSequence
            .Builder(setOf(C.TRACK_TYPE_VIDEO, C.TRACK_TYPE_AUDIO))
            .also {
                if (startGapMs > 0L) it.addGap(startGapMs * US_PER_MS)
            }
            .addItem(editedMediaItem)
            .also {
                if (endGapMs > 0) it.addGap(endGapMs * US_PER_MS)
            }
            .build()
    }
... rest of function in step 3

2. Create a custom VideoCompositionSettings which fades the video in/out as needed

class MyVideoCompositionSettings(private val changeTimesMs: List<Long>) : VideoCompositorSettings {
    override fun getOutputSize(inputSizes: List<Size>): Size {
        return inputSizes.maxBy { it.width }
    }

    override fun getOverlaySettings(inputId: Int, presentationTimeUs: Long): OverlaySettings {
        val startUs = if (inputId > 0) changeTimesMs[inputId - 1] * US_PER_MS else 0L
        val endUs = changeTimesMs[inputId] * US_PER_MS
        val isVisible = presentationTimeUs in startUs..endUs
        // Calculate alpha based on cross over time (omitted for simplicity)
        return StaticOverlaySettings.Builder()
            .setAlphaScale(if(isVisible) 1F else 0F)
            .build()
    }
}

3. Create the composition

    // Follow on from code in step 1
    val changeOverTimes = startTimesMs.mapIndexed { index, start -> start + durationsMs[index] }
    val videoCompositionSettings = MyVideoCompositionSettings(changeOverTimes)

    return Composition.Builder(sequences)
        .setVideoCompositorSettings(videoCompositionSettings)
        .build()
}

4. Play the composition in a CompositionPlayer

Expected result

The videos play in sequence with some cross over and fade effect (once alpha calculation added to VideoCompositionSettings)

Actual result

• The player plays the first video then stops at the last frame of the first video. The seek bar and time keep going. The playback time does not stop at the end of the video either (e.g. 10 second total video will keep counting up and not stop at 10 seconds)
• If audio is enabled then audio for second item can still be heard
• Note that exporting the video using a Transformer works without fault.
• Also removing the cross over (setting CROSS_OVER_MS to 0) works without fault.

https://github.com/user-attachments/assets/96998000-559f-434a-a775-0790bc691b0d

Media

https://github.com/user-attachments/assets/84de1b71-38d9-4167-af9b-9601c13909c4
https://github.com/user-attachments/assets/a3d369ce-138a-4035-98d2-0374e03affaf

Bug Report

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