ffmpeg

ffmpeg -i '/media/in.dv' -map 0.0 -map 0.1 -y -f flv -er 3 -acodec
libmp3lame -ab 160k -ar 22050 -ac 1 -b 320k -vcodec flv -padcolor 000000
-padtop 0 -padbottom 0 -s 450x360 '/media/out.flv'