mencoder mf://@,i -mf fps=${video_fps:-25}:type=$ix -ovc lavc -lavcopts vcodec=ffv1 -o $o

ffmpeg -i $i -b ${bitrate:-800}k -acodec libmp3lame -ab ${audio_bitrate:-128}k -pass 1 -an -f $ox -y /dev/null
ffmpeg -i $i -b ${bitrate:-800}k -acodec libmp3lame -ab ${audio_bitrate:-128}k -pass 2 $o
rm -f ffmpeg2pass*.log