[Bug 676752] New: Audio cutout with pulseaudio jack sink.

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Thu May 24 09:14:08 PDT 2012


https://bugzilla.gnome.org/show_bug.cgi?id=676752
  GStreamer | don't know | 0.10.12

           Summary: Audio cutout with pulseaudio jack sink.
    Classification: Platform
           Product: GStreamer
           Version: 0.10.12
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: Robert.M.Davies at blueyonder.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Firstly a couple of notes: I've rated this as major as it affects all audio on
my system and makes music and movies unlisten/watchable. I cannot be 100% sure
this is gstreamer, but as the problem first appeared when I added the
ppa:gstreamer-developers/ppa repository to my sources, it seems possible. If
you point me to pulseaudio, I'll go and bother them instead, but really I just
want to track down the source of the problem. The Ubuntu multimedia forums are
no use. If we uncover and/or fix a bug on the way, then even better!

So here we go...

I was debugging a problem with Amarok
(https://bugzilla.gnome.org/show_bug.cgi?id=653124), and in the process, I
upgraded a number of packages.
This was a while (at least several months) ago, and unfortunately I can't
remember which packages, or even what date I updated.

Ever since, I am unable to play pulseaudio output (i.e. Amarok, Dragon player)
through jack (using the jack sink module) without audio cuting out. Previously
it was fine.
I have tried removing the gstreamer ppa from my software sources and
reinstalling all the related packages I can think of. I have tried switching
between jack1 and jack2.
Still no use.

A couple of things worth mentioning: Jack is not reporting any xruns, and is
capable of running smooth output from elsewhere at the same time as the choppy
pulseaudio sink, so I'm fairly sure this isn't jack.
Going into the pulseaudio volume control and setting the audio stream (e.g.
amarok or dragon) to play directly through the soundcard interrupts the
playback (as jack is accessing the soundcard). However, if I switch back to
jack sink again, the remainder of the audio stream plays without audio
dropouts. The choppiness starts again with the beginning of a new track. It's
always possible to fix the problem temporarily by switching the audio stream
away from and back to the jack sink.

I have since added a gstreamer ppa again, though it's only supplying me with
gstreamer 0.10.12-1ubuntu1.

Can anyone suggest a method of troubleshooting to track down what might be the
cause and restore the previous smooth playback?

Any advice or comments however vague are much appreciated.

Thanks in advance,

Rob

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