ffmpeg:

• ffmpeg -i fi -vcodec h264 -acodec mp2 fo.mp4 (convert vid to mp4)
• ffmpeg -i fi -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis fo.webm (convert vid to webm)

Legend:
fi = path to file in
fo = path to file out