General WebM creation thread.
Tips and Tricks are welcome.
Some useful tools can you find here:
https://github.com/Kagami/webm.py/wiki/Related-links
For Linux I recommend pure ffmpeg or the webm.py tool.
On Windows you should use the WebMConverter.
https://gitgud.io/nixx/WebMConverter
Additional information:
Max filesize is 50MB
No .mp4 allowed, this is a .webm board.
Example ffmpeg lines:
For vp8 I would use this, you can change the bitrate to whatever you like, the higher it gets the bigger the file will be.
ffmpeg -i INPUT.mp4 -c:v libvpx -crf 12 -b:v 1000K -vf scale=720:-1 OUTPUT.webm
For vp9 I am using webm.py and a sample line looks like this:
ffmpeg -hide_banner -i INPUT.mp4 -pass 2 -passlogfile /tmp/tmpr3a1apey -sn -c:v libvpx-vp9 -speed 1 -tile-columns 6 -frame-parallel 0 -b:v 808.3k -threads 4 -auto-alt-ref 1 -lag-in-frames 25 -pix_fmt +yuv420p -ac 2 -c:a libopus -b:a 64k -f webm -y OUTPUT.webm
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