I've converted the alpha track to IVF using the following command to select the correct stream in FFmpeg, hopefully it will work to reproduce the issue: `ffmpeg -i testcase.avif -map 0:1 -c:v copy testcase.ivf"
Bug 1814790 Comment 23 Edit History
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I've converted the alpha track to IVF using the following command to select the correct stream in FFmpeg, hopefully it will work to reproduce the issue: `ffmpeg -i testcase.avif -map 0:1 -c:v copy testcase.ivf`