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Thanks kanaka for testing and reporting!
Please note that the quantization scale is different in AV1 and xvc, so a lower qp in xvc might still produce lower rate (and worse quality) than AV1.
Without a completed encoding and matching file sizes I'm afraid screenshot comparisons doesn't provide much information.
If you are interested in still image comparisons you could perhaps start with encoding a single frame and make sure the file sizes are roughly the same.
Indication of command line settings and encoding times is of course also helpful to better understand what is being compared.
Regarding support for repacking .xvc files to .mp4 and vice versa, we have not yet added support for this in our ffmpeg version but it is on our todo list.
I hope the xvc-in-mp4 support in ffplay is sufficient for the time being, as suggested by LigH.
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