[FFmpeg-trac] #4954(avformat:new): joint stereo indicator missing from mp3 headers

FFmpeg trac at avcodec.org
Wed Aug 2 03:30:35 EEST 2017

#4954: joint stereo indicator missing from mp3 headers
             Reporter:  pico4743    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mp3         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by GraniteStateColin):

 This problem is still a problem. It's very easy to reproduce per
 pico4743's explanation above.

 Another way to reproduce: Install the current released version of ffmpeg
 for Windows (don't think the OS matters, but that's what I happened to be
 using) 3.3.2 as of this post. Convert a file from WAV to MP3 using the
 '-joint stereo 1' flag. Test the status of the file with Mp3tag -- shows
 Stereo instead of Joint Stereo. Note that the same LAME library used in
 Audacity correctly sets the file to Joint Stereo.

 In my case, I was banging my head against this before finding this bug
 report which confirms the problem I was seeing. Basically, the
 -joint_stereo switch is useless, because anything playing the file thinks
 it's still in stereo, and NOT joint stereo. Programs like Mp3tag report
 the output files as Stereo and not as Joint Stereo making this easy to
 test and validate.

Ticket URL: <https://trac.ffmpeg.org/ticket/4954#comment:2>
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