https://thethemefoundry.com/blog/convert-mp4-to-webm/
#!/bin/bash
VIDEOS=~/Desktop/video-folder/
find "$VIDEOS" -name '*.mp4' -exec sh -c 'ffmpeg -i "$0" -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis "${0%%.mp4}.webm"' {} \;
exit;
https://thethemefoundry.com/blog/convert-mp4-to-webm/
#!/bin/bash
VIDEOS=~/Desktop/video-folder/
find "$VIDEOS" -name '*.mp4' -exec sh -c 'ffmpeg -i "$0" -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis "${0%%.mp4}.webm"' {} \;
exit;