#4954: joint stereo indicator missing from mp3 headers ------------------------------------+------------------------------------ Reporter: pico4743 | Owner: (none) Type: defect | Status: open Priority: normal | Component: avformat Version: git-master | Resolution: Keywords: mp3 | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ------------------------------------+------------------------------------ Comment (by GraniteStateColin): Confirmed that the bug still exists in version 7.0.1 of ffmpeg. Given the age of the bug, I am concerned that because this is not a problem for some important users, this bug is just being dismissed or ignored as low- priority. I accept that there may be other issues that are higher priority for some users. However, please understand that for our use case across a large number of users (including all our clients), this is the single biggest problem we have with ffmpeg. This issue alone forces us to run all MP3 files through both ffmpeg and SoX to get them generated properly with the correct header, where all that SoX is doing at this point is correcting the ffmpeg Joint Stereo header bug. Before dismissing this as a false claim, this is necessary for us because diagnostic tools we must use for volume checks in SoX rely on the header, which ffmpeg sets to Stereo instead of Joint Stereo. Customer friendly diagnostic tools that our users use, specifically Mp3tag, also rely on the header and therefore misreport as Stereo. And because Stereo files are not acceptable, with many legacy players requiring Joint Stereo specifically and failing to play Stereoe files at all (and providing worse sound quality in all cases even for players that can handle both), we must reject any files that show "Stereo" as the format in the header. Hence the need to use SoX just to fix the header to avoid these automatic rejections. Please put fixing this bug into the development queue for 2024 or as soon as is reasonably possible. -- Ticket URL: <https://trac.ffmpeg.org/ticket/4954#comment:13> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker