VP8
From Jon's Wiki
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Here's how to encode to a VP8/Vorbis WebM file:
ffmpeg -i SOME_VIDEO.mkv -threads 8 -f webm -vcodec libvpx \ -g 120 -level 216 -profile 0 -qmax 42 -qmin 10 -vb 1800K \ -acodec libvorbis -aq 5 -ac 6 SOME_VIDEO.webm
Requires ffmpeg >= 0.60 and assumes your playback can handle 5.1 surround Vorbis using libvorbis >= 1.4