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Ok, problem with avidemux is it not supported VP8 VP9 and other video conversion. But I believe KDENlive can export to webm easily. Lots of NLE software export to webm by default.
Edit - The problem is you have video in format that is not supported with webm container. If you have video in vp8 or vp 9 not in h263, h264 or h265 so there is no problem. You need to find software that can export video to VP 8 or 9 and audio to vorbis or opus. Then you can mux it to webm container in avidemux. But good luck with this video codec.
I wouldn't personaly touch anything to have something common with google with 10 foot long pole....
BernixLast edited by Bernix; 9th Aug 2018 at 14:31. Reason: Edit
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You can try a lower number for crf and add a few other options as well. See this page for details. You could also try the VP9 encoder.
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Trying this now:
Code:ffmpeg -i input.mp4 -c:v libvpx -qmin 0 -crf 5 -b:v 1M -c:a libvorbis output.webm
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Better try this, a little slow but great quality (11 fps for a 720p video in a i7-7700HQ running at 2.8 Ghz):
Code:"ffmpeg.exe" -i input.mp4 -c:v libvpx-vp9 -pass 1 -passlogfile logfile -crf 24 -b:v 1000k -minrate 10k -maxrate 4000k -threads 8 -deadline good -cpu-used 4 -tile-columns 0 -frame-parallel 0 -qmax 32 -auto-alt-ref 1 -lag-in-frames 24 -g 240 -aq-mode 0 -an -f null NUL "ffmpeg.exe" -i input.mp4 -c:v libvpx-vp9 -pass 2 -passlogfile logfile -crf 24 -b:v 1000k -minrate 10k -maxrate 4000k -row-mt 1 -threads 8 -deadline good -cpu-used 1 -tile-columns 2 -tile-rows 0 -frame-parallel 0 -qmax 32 -auto-alt-ref 1 -lag-in-frames 24 -g 240 -aq-mode 0 -c:a libopus -b:a 96k -ac 2 -f webm "output.webm"
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