[gst-devel] Trouble with 96kHz playback

[Marcus Alley]

Hi,

I'm having trouble getting gstreamer to playback at a 96kHz sampling
rate.  I'm have a FC6 machine running kernel 2.6.18, with the following
gstreamer components installed:

gstreamer.i386                           0.10.10-2.fc6        
gstreamer-debuginfo.i386                 0.10.10-0.gst.1.5    
gstreamer-devel.i386                     0.10.10-2.fc6        
gstreamer-plugins-bad-debuginfo.i386     0.10.3-0.gst.3.5     
gstreamer-plugins-base.i386              0.10.10-1.fc6        
gstreamer-plugins-base-debuginfo.i386    0.10.10-0.gst.1.5    
gstreamer-plugins-base-devel.i386        0.10.10-1.fc6        
gstreamer-plugins-good.i386              0.10.4-1.fc6         
gstreamer-plugins-good-debuginfo.i386    0.10.4-0.gst.1.5     
gstreamer-plugins-good-devel.i386        0.10.4-1.fc6         
gstreamer-plugins-ugly.i386              0.10.4-3.lvn6        
gstreamer-plugins-ugly-debuginfo.i386    0.10.4-0.gst.1.5     
gstreamer-plugins-ugly-devel.i386        0.10.4-3.lvn6        
gstreamer-tools.i386                     0.10.10-2.fc6        

I have a M-audio USB Transit card, with the following very simple
asound.conf file:

  pcm.!default {
    type plug
    slave.pcm "digital-mix"
  }

  pcm.digital-mix {
    type rate
    slave {
      pcm "hw:1,0"
      rate 96000
    } 
    converter "samplerate_medium"
  }

I can play .wav files directly from the command line with no trouble
using aplay:
> aplay blah.wav

The problem is when I try with gstreamer:
> gst-launch-0.10 filesrc location=./blah.wav ! wavparse ! alsasink
> gst-launch-0.10 filesrc location=./blah.flac ! decodebin ! alsasink

Both of these commands work as long as there are no other "events"
taking place on the computer.  By that I mean as soon as I move the
mouse (or resize a window, etc.) the playback stops, or becomes garbled,
and the CPU loads jumps to 100%.

At this point obviously you'd probably like to know more, and I'm happy
to try any debugging steps you could suggest.  I also apologize if this
has been asked before, and if there's a fix just point me in the right
direction.

Thanks,
Marc Alley