On 6/21/22 15:15, Bill Cunningham wrote:
    Does this show anything? And, I did try webm and it worked fine. IDK which is the smaller file, webm or mp4. I usually watch this stuff with vlc on windows or an OS using vlc.

I tried ffmpeg -formats mp4 -i re.iso re.mp4,

[mpeg4_v4l2m2m @ 0x55caf16f2dc0] Could not find a valid device
[mpeg4_v4l2m2m @ 0x55caf16f2dc0] can't configure encoder

This is still your original problem which I explained to you then. That is a hardware encoder and you don't have whatever hardware it's looking for. You have to use "-vcodec" to select a different encoder.

Try "-vcodec libopenh264" since you're still using ffmpeg from the Fedora repo.
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