[mythtv-users] mpeg2 to audio conversion

M L Truscott mltruscott at btinternet.com
Thu Sep 20 18:28:44 UTC 2007

On Thursday 20 September 2007 16:23:59 Jon Larson wrote:
> David Watkins wrote:
> > On 20/09/2007, M L Truscott <mltruscott at btinternet.com> wrote:
> >> I have some mpeg2 files from dvb radio I'd like to strip the video
> >> stream from and store as oggs/mp3s.
> >>
> >> Any one know of a way of doing it?
> >
> > I've used this in the past to strip audio to a wav.  Should be easy
> > enough to get to mp3 or ogg from there.
> >
> > mplayer infile.mpg -vo null -ao pcm:file=outfile.wav
> The following ffmpeg command will capture audio from an mpeg2 source and
> save it as low-bitrate mp3. It is optimized for voice, so if your radio
> recordings are music you should raise the -ab and -ar values to 192 (in
> kbits) and 44100 in Hz), and remove the '-ac 1' option.
> ffmpeg -v quiet -y -i infile -ab 32 -acodec mp3 -ar 22050 -ac 1 outfile.mp3
> Jon

I tried the above and this was the result:

 ffmpeg -v quiet -y -i /myth/1708_20070920175900.mpg -ab 193 -acodec mp3 -ar 
44100 /myth/content/Music/Doctor_Who.mp3
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2004 Fabrice Bellard
configuration:  --enable-gpl --enable-pp --enable-pthreads --enable-vorbis --enable-libogg --enable-a52 --enable-dts --enable-libgsm --enable-dc1394 --disable-debug --enable-mp3lame --enable-faadbin --enable-faad --enable-faac --enable-xvid --enable-x264 --enable-amr_nb --enable-amr_wb --enable-shared --prefix=/usr 
  libavutil version: 0d.49.0.0
  libavcodec version: 0d.51.11.0
  libavformat version: 0d.50.5.0
  built on Mar 21 2007 14:14:05, gcc: 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
Stream mapping:
  Stream #0.0 -> #0.0
Error while opening codec for output stream #0.0 - maybe incorrect parameters 
such as bit_rate, rate, width or height

I've clearly missed something - any help please?

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