[gstreamer-bugs] [Bug 628218] New: Sound distortion with stereo upmix

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=628218
  GStreamer | gstreamer (core) | 0.10.x

           Summary: Sound distortion with stereo upmix
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: nordisch-herb at gmx.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=168969)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=168969)
custom asoundrc

On Gentoo as well as on Ubuntu (all 32 and 64bit versions between 9.04 -
10.04), I'm experiencing some trouble getting gstreamer to play well with my
working alsa stereo upmix (custom .asoundrc). 

I already had a pure alsa setup (without gstreamer and pulseaudio) working
flawlessly. Now I've decided to install gstreamer again on Gentoo, which is
necessary to get players like guayadeque or banshee to work, but with gstreamer
alsasink the upmix only works for 1 or 2 minutes and then the sound gets
distorted. 
It's like the music is played at least twice as fast (though my receiver still
thinks its dolby surround and plays this ugly noise). 

Alsa alone works fine, most lightweight players with pure alsa upmix cause only
up to 7% cpu use per core (dual-core system); the same players go up to 36% per
core, when I use gstreamer, plus a little more after the sound finally crashes. 

I've tested this with several alsa and gstreamer versions and on several
computers (actually Ubuntu 8.10 had the last working gstreamer version for me).

I know that stereo to 5.1 upmix isn't common, but I'd be happy if this could be
fixed somehow. Please notify me if further informations are needed.

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