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

Josh Triplett josh at freedesktop.org
Tue Dec 11 09:17:55 UTC 2007

Loïc Minier wrote:
> On Mon, Dec 10, 2007, Josh Triplett wrote:
>> 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.
>  I don't think you tried with anything else than MP3; do you hear
>  cracking with other formats?

I tested with both Ogg Vorbis and FLAC files, and didn't find any files that
cracked.  However, I just tried a few other files from my music library, and
I found one Ogg Vorbis file which cracks as well, and I know it did not do so
before.  So apparently the problem does not only occur with MP3s.

- Josh Triplett

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