Transformer: Color Discrepancy between Single and Multiple BitmapOverlay

Version

Media3 main branch

More version details

We are trying to create a video with a generated Bitmap. This Bitmap will be constructed from multiple layers.
We found out that there's a discrepancy in the result between using a single BitmapOverlay where we combine the layers first and multiple BitmapOverlay where we pass the responsibility to the Transformer.

Here you can see the difference between the image when we're using single BitmapOverlay vs multiple BitmapOverlay.
As a context, the result that we are expected is the one in single BitmapOverlay

BitmapOverlay	Result
Single
Multiple

For more information, you can check this demo repository: https://github.com/esafirm/media3-transformer-demo

Devices that reproduce the issue

Any device.

Devices that do not reproduce the issue

Reproducible in the demo app?

No

Reproduction steps

In the demo app:

1. Press the export button in the app
2. It will generate two videos in /Download/ directory:

merged-output*.mp4 --> This is the video created with single BitmapOverlay
separated-output*.mp4 --> This is the video create with multiple BitmapOverlay

Expected result

Actual result

Media

Any media is fine. Here's the one in the demo repo: https://github.com/esafirm/media3-transformer-demo/blob/main/app/src/main/assets/audio.m4a

Bug Report

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