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

[Sebastian Dröge]

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...
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