[pulseaudio-discuss] bug in gstreamer or pulseaudio?

Achim Frase achim.frase at googlemail.com
Tue Aug 12 06:50:25 PDT 2008

Am Dienstag, den 12.08.2008, 14:25 +0100 schrieb Colin Guthrie:
> Achim Frase wrote:
> > If I try to record 5.1 sound with this command line the channels get
> > mixed up.
> > 
> > gst-launch pulsesrc
> > device=alsa_output.pci_8086_284b_sound_card_0_alsa_playback_0.monitor !
> > queue ! audio/x-raw-float,rate=44100,channels=6 ! audioconvert !
> > vorbisenc quality=.8 ! oggmux ! filesink location=outtest.ogg
> > 
> > If someone finds the time to look at it, that would be nice.
> > http://bugzilla.gnome.org/show_bug.cgi?id=547258
> I think channel mapping is a bit of a black art. You may need to specify 
> your own channel map when loading the alsa source.... although as you 
> are using a monitor, you perhaps need a "remap source" module loaded 
> (which is a shame as AFAIK, there is only a remap-sink module right now!).

okay, interesting.

> All that said, as it presumably works fine for output, you'd expect that 
> recording from the monitor, you'd get a file that you could then output 
> properly.

Yes, my channel mapping seems to work quite good for playback
(out-of-the-box). But it is a bit tricky to record 5.1 Sound.
I was not able to record the sound properly with pacat. I have tried
some options but without much success.

> That said, I've had issues with oggs before where they get the mapping 
> wrong :s

Thanks for your help so far.


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