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Use Avanti with ffmpeg. The former has a job control manager where you drop in multiple files at once and go. You can find webm encoding guide for ffmpeg here: http://trac.ffmpeg.org/wiki/Encode/VP8 Use crf mode encoding and experiment till you get desired size. Set b:v high like 10M and tweak CRF value and if you have no audio, use -an in place of -c:a ...
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