#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> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker