ffmpeg -i balloon-2.webm -an balloon-2-nosound.webm
ffmpeg -i infile.flv -vcodec wmv2 -sameq -acodec wmav2 -f output.wmv
for f in *.mp4; do ffmpeg -i $f -acodec libvorbis -vcodec libtheora -ac 2 -ab 128k -ar 44100 -b:v 900k -s 1024x576 -y $f.ogv 2> /dev/null &; done
for f in *.mp4; do ffmpeg -i $f -acodec libvorbis -ac 2 -ab 128k -ar 44100 -b:v 900k -s 1024x576 -y $f.webm 2> /dev/null &; done