Bug#455691: MP3 Decoding regression: audible clipping and popping

Josh Triplett josh at freedesktop.org
Tue Dec 11 09:27:40 UTC 2007

reassign 455691 alsa-lib
forcemerge 437827 455691

Sebastian Dröge wrote:
> Am Montag, den 10.12.2007, 23:38 -0800 schrieb Josh Triplett:
>> Package: gstreamer0.10-plugins-ugly
>> Version: 0.10.6-3
>> Severity: normal
>> Recently, I noticed that quodlibet started clipping some mp3s, with a
>> noticeable static pop.  Other players, such as mplayer or totem (using
>> totem-xine), play the same files fine with no clipping.  I tried
>> gst-launch with the mad decoder, and it had the same clipping.
>> gst-launch with "ffdemux_mp3 ! ffdec_mp3" as the decoder did not clip.
>> Finally, I tried using sox (which uses libmad) to convert the file
>> from mp3 to wav, which generated the message "sox sox: temp.wav:
>> output clipped 48802 samples; decrease volume?".  However, the resulting wav
>> did not clip in any player.
>> I tried to downgrade gstreamer to an older version to determine what
>> version introduced the regression, but the resulting gstreamer did not
>> want to play mp3s; mad would not hook up to alsasink, or to wavenc.
>> As a first guess, I've filed the bug against
>> gstreamer0.10-plugins-ugly; however, the problem may well lie
>> elsewhere.
>> Happy to run further tests to narrow down the problem.
> Hi,
> could you try the alsa-lib patch from bug #437827?
> http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=42;filename=fix-sampling-bit-shifts.patch;att=1;bug=437827
> This is most likely exactly that bug...

Yes, that fixes the problem.  Thanks!

- Josh Triplett

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