Bug#455691: MP3 Decoding regression: audible clipping and popping
josh at freedesktop.org
Tue Dec 11 07:38:40 UTC 2007
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
Happy to run further tests to narrow down the problem.
- Josh Triplett
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