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this post was submitted on 18 Dec 2025
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Okay looks like your format spec should look something like
'bv*[ext=mp4][vcodec!^=av01]+ba[ext=m4a]/b[ext=mp4][vcodec!^=av01]'. Single quotes needed to keep shell expansion from fighting me, not sure if that will be an issue for you. You may have intended this, but the extension restriction does mean that you'll sometimes skip "better" formats like VP9 if they are webms or something, and you can specify an output mux if that is what you are trying to achieve.