[Bug]: a dip clip transition only covers a source-sized rectangle of the output frame

[choim4389]

Package Version

2.11.0

Flutter Version

3.44.8

Platforms

Android

How to reproduce?

Render two segments whose source resolutions differ from the requested output resolution, with a fadeToBlack (or fadeToWhite) transition between them:

await ProVideoEditor.instance.renderVideoToFile(outputPath, VideoRenderData(
  videoSegments: [
    VideoSegment(                                        // 1080x1920 source
      video: EditorVideo.file(File(portrait1080x1920)),
      transition: const ClipTransition(
        type: ClipTransitionType.fadeToBlack,
        duration: Duration(milliseconds: 500),
      ),
    ),
    VideoSegment(video: EditorVideo.file(File(square720x720))),  // 720x720 source
  ],
  qualityConfig: VideoQualityConfig.custom(resolution: const Size(1080, 1920)),
  outputFormat: VideoOutputFormat.mp4,
));

Expected: the whole output frame dips to black at the seam

Actual: the first half of the dip (on the 1080x1920 clip) is correct, but over the second clip the dip is a 720x720 black square centered in the 1080x1920 frame. The square clip is presented at 1080x1080,
so a ring of un-dipped video is left around the square, and it visibly pops as the dip fades out.

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Example code (optional)

Device Model (optional)

No response

[github-actions]

This issue is stale because it has been open for 3 days with no activity.