[Bug 692953] alsa modules are silent or noisy after several hours of use

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692953
  GStreamer | gst-plugins-base | 1.0.9

--- Comment #75 from Thomas DEBESSE <thomas.debesse at rcf.fr> 2013-08-30 10:23:51 UTC ---
I have relaunched the same pipeline, with other things around.

I have one pipeline running an audiotestsrc:

gst-launch-1.0 -v audiotestsrc ! audioconvert ! audioresample ! alsasink
device=hw:DSX

(yes, the audioresample and audioconvert are superfluous, but this is a test
suggested in Comment #56, this pipeline is running properly for the moment)

the sound is brought to this pipeline (with a physical audio cable):

gst-launch-1.0 -v alsasrc device=hw:XFi ! alsasink device=hw:Juli sync=true

then the sound is listened on a physical speaker and recorded with another
soundcard in that way:

arecord -f dat -D hw:Live 20130830.gstreamer-problem.wav

The sound looks like that before become silent (in less than 15min):
[5.6Mo]
http://dl.illwieckz.net/u/thomas-debesse/bug-report/gstreamer/bug-692953/20130830.gstreamer-drift-problem.wav
[92Ko]
http://dl.illwieckz.net/u/thomas-debesse/bug-report/gstreamer/bug-692953/20130830.gstreamer-drift-problem.png

there is one (and only one):

0:08:33.250492914  4683  0x842ec90 WARN           audiobasesink
gstaudiobasesink.c:1273:gst_audio_base_sink_skew_slaving:<alsasink0> correct
clock skew 20000054 > 20000000
0:08:33.250549670  4683  0x842ec90 WARN           audiobasesink
gstaudiobasesink.c:1579:gst_audio_base_sink_get_alignment:<alsasink0>
Unexpected discontinuity in audio timestamps of +0:00:00.010340136, resyncing

before silent, when sound is distorded

after that, some minutes later, we can read that:

0:14:33.267288156  4683  0x842ec90 WARN           audiobasesink
gstaudiobasesink.c:1273:gst_audio_base_sink_skew_slaving:<alsasink0> correct
clock skew 20099300 > 20000000
0:14:34.047324993  4683  0x842ec90 WARN           audiobasesink
gstaudiobasesink.c:1273:gst_audio_base_sink_skew_slaving:<alsasink0> correct
clock skew 20024971 > 20000000

become more and more recurrent (but without the "resyncing" line), until the
pipeline becomes silent. When the pipeline becomes silent, the output log is
very verbose.

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