Using ffmpeg to extract audo from VOB

[offcenter77]

I'm using ffmpeg to extract the audio from a DVD. I was able to use the following command on almost all of the VOB files on the disk:

ffmpeg -i mount_point/video_ts/vts_05_3.vob -f mp3 file_3.mp3

It worked for all but one of the VOB files. For one of them I'm getting the following errors. Can anybody tell me what's wrong?

$ ffmpeg -i mount_point/video_ts/vts_05_3.vob -f mp3 file_3.mp3
FFmpeg version SVN-r7813, Copyright (c) 2000-2006 Fabrice Bellard, et al.
  configuration:  --prefix=/usr --incdir=/usr/include/ffmpeg --libdir=/usr/lib --shlibdir=/usr/lib --mandir=/usr/share/man --arch=x86_32 --extra-cflags=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables --enable-mp3lame --enable-libogg --enable-libtheora --enable-vorbis --enable-faad --enable-faac --enable-libgsm --enable-xvid --enable-x264 --enable-a52 --enable-a52bin --enable-dts --enable-pp --disable-static --enable-shared --enable-gpl --disable-debug --disable-opts --disable-strip
  libavutil version: 49.3.0
  libavcodec version: 51.30.0
  libavformat version: 51.8.0
  built on Feb  4 2007 08:21:24, gcc: 4.1.1 20070105 (Red Hat 4.1.1-51)
Input #0, mpeg, from 'mount_point/video_ts/vts_05_3.vob':
  Duration: 00:30:48.7, start: 3561.932300, bitrate: 4645 kb/s
  Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x480, 9570 kb/s, 29.97 fps(r)
  Stream #0.1[0x81]: Audio: ac3, 48000 Hz, stereo, 128 kb/s
  Stream #0.2[0x82]: Audio: ac3, 48000 Hz, stereo, 128 kb/s
  Stream #0.3[0x80]: Audio: ac3, 48000 Hz, 5:1, 224 kb/s
  Stream #0.4[0x20]: Subtitle: dvdsub
File 'file_3.mp3' already exists. Overwrite ? [y/N] y
Output #0, mp3, to 'file_3.mp3':
  Stream #0.0: Audio: mp3, 48000 Hz, 5:1, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
Error while opening codec for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

[offcenter77]

Anybody? Even if it's just a pointer in the right direction...

[lazlow]

Sometimes files are just screwed up. ffmpeg is pretty handy at fixing them. Before you do your stuff(above) see if this will fix the file:

ffmpeg -i input.file -sameq output.file

Good Luck
Lazlow

[offcenter77]

Nope. That didn't work either. Got the same error.

I was able to get it to extract it as a wav file, but when I play it, it sounds like its on high speed (3x or 4x or something). I tried to reduce the speed in Audacity, but after several attempts, I can't get it to the right speed so it sounds normal.

[offcenter77]

I was finally able to do it with avidemux. Apparently, this particular VOB File had multiple mpegs and audio tracks mixed together. Avidemux was able to separate the two, and I could simply pick the audio track that I wanted. I used the twolame encoder and saved the file as an mp3.

Thanks!

[jerryleem412]

I realize this post is old, but wanted to update in case anyone needed an answer to it.
FFMPEG will attempt to grab the first index from the VOB file...I use index loosely since I can't remember the proper term.

So If you want to extract a Audio stream from this use the following:

ffmpeg -i mount_point/video_ts/vts_05_3.vob -map 0:3 -f mp3 file_3.mp3

This will grab "Stream #0.3[0x80]: Audio: ac3, 48000 Hz, 5:1, 224 kb/s"

With the original command your using your trying to grab video and put it into an audio format.