ffmpeg webm à mp4
ffmpeg -i "01 - file.webm" -crf 23 "file.mp4"
Horrible Hyena
ffmpeg -i "01 - file.webm" -crf 23 "file.mp4"# lower -crf value = higher quality & larger output
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libvorbis output.webm
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