#4954: joint stereo indicator missing from mp3 headers
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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 |
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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
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