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Interesting problem - looking at the ffmpeg or ffprobe output you notice that there is SAR and DAR (source/dest aspect ratio?). These are not the same thing. E.g. I wanted simply to fix a video with a wrong AR, so I ran ffmpeg -i input.mp4 -vf setdar=16/10 output.mp4. It didn't want to allow -c:v copy! However, when I played the video with mpv, there was: VO: [gpu] 600x480 => 768x480 yuv420p ...
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