>>530383856
It's a command to convert mp4 into webm using ffmpeg. Here's a guide for installing yt-dlp, which you can use to download Twitter videos. You'll install ffmpeg in the process. Also I think that I fugged up and pasted the wrong command, and that the right command would be:

.\ffmpeg -i filename.mp4 -c:v libvpx -crf 25 -b:v 8M -c:a libvorbis filename.webm