dtach -A /tmp/mplayer.sock \
mplayer dvd://4 -dvd-device /dev/sr0 \
 -dumpstream -dumpfile /tmp/dvd4.vob
dtach -A /tmp/ffmpeg.sock \
ffmpeg \
 -analyzeduration 200M -probesize 200M -i /tmp/dvd4.vob\
 -map 0:v:0 -map 0:i:0x80 -map 0:i:0x81\
 \
 -metadata:s:a:0 language=fra -metadata:s:a:0 title="Francais - 5.1" -metadata:s:a:1 language=fra -metadata:s:a:1 title="Francais - Mono"\
 \
 -c:a copy -c:v libx264 -c:s copy \
 MELODIE_EN_SOUS_SOL.mkv