Linux: Extract Audio From Video File (Video To Mp3)

How do I extract audio from video file such as .avi/.mpg/.flv in Linux and UNIX and convert it to .mp3 file?

You can use mplayer which is a movie player for Linux and UNIX. It can play most MPEG/VOB, AVI, ASF/WMA/WMV, RM, QT/MOV/MP4, Ogg/OGM, MKV, VIVO, FLI, NuppelVideo, yuv4mpeg, FILM and RoQ files, supported by many native and binary codecs. You can watch VCD, SVCD, DVD, 3ivx, DivX 3/4/5, WMV and even H.264 movies, too. The same tool can be used to covert or extract audio from files. The syntax is as follows:

 
mplayer -dumpaudio -dumpfile output_filename.mp3 input.video_file.name
 

Where,

1. -dumpaudio : Dumps raw compressed audio stream to ./stream.dump (useful with MPEG/AC-3, in most other cases the resulting file will not be playable). If you give more than one of -dumpaudio, -dumpvideo, -dumpstream on the command line only the last one will work.
2. -dumpfile filename.mp3 : Specify which file (filename.mp3) MPlayer should dump to. Should be used together with -dumpaudio / -dumpvideo / -dumpstream.

Task: Extract Audio From .AVI File

Type the command as follows to extract audio from clip.avi to clip_track.mp3:
$ mplayer -dumpaudio -dumpfile clip_track.mp3 clip.avi
You can play extracted audio with mplayer command itself:
$ mplayer clip_track.mp3

Task: Extract Audio From VCD or DVD Track

The following command will extract audio from vcd track # 4:
$ mplayer vcd://04 -cdrom-device /dev/sr0 -dumpaudio -dumpfile /tmp/track04.mp3
The following command will extract audio from DVD track # 4:
$ mplayer dvd://04 -cdrom-device /dev/sr0 -dumpaudio -dumpfile /tmp/track04.mp3
You can extract track 5 to 10 using the bash for loop as follows:

 
for i in {05..10}
do
  mplayer vcd://$i -cdrom-device /dev/sr0 -dumpaudio -dumpfile /tmp/track$i.mp3
done
 

Task: Extract Audio From Stream

Use the following syntax:
$ mplayer -dumpstream http://example.com/xyz/3 -dumpfile /tmp/stream_03.mp3

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