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In current FFmpeg, whenever Matroska with ProRes is demuxed it creates an atom that is just 8 bytes short of the true size necessary. We can work around this by padding the actual packet by 8 0x00 bytes, which should result in older FFmpeg versions working fine. An FFmpeg patch is available: http://ffmpeg.org/pipermail/ffmpeg-devel/2019-September/250724.html