[gst-devel] multichannel vorbis

[Tristan Matthews]

You probably have to set the "channel-positions" property on the 
interleave element, which you can't do with gst-launch as I recall (i.e. 
you need to write c or python app for it) as it is an array. However for 
more than 8 channels the positions might have to all be set to  
GST_AUDIO_CHANNEL_POSITION_NONE

Are you just trying to do something like this?

gst-launch -v jackaudiosrc connect=none ! audio/x-raw-float, channels=24 
! vorbisenc ! vorbisdec ! jackaudiosink connect=none

(note that the bottleneck here will probably be your soundcard).

-Tristan

Dirk Griffioen wrote:
> Thanks for the answer!
>   
>> I think you need to interleave several mono channels from audiotestsrc
>> into a stereo stream and then shove them into the vorbis encoder. You
>> need an audio mixer, or something like that.
>>   
>>     
> I would like to encode separate channels.
>
> For example, this runs
>
> gst-launch-0.10 -v interleave name=i ! queue ! \
> vorbisenc ! vorbisdec ! \
> jackaudiosink connect=none \
> jackaudiosrc ! audioconvert ! queue ! i. \
> jackaudiosrc ! audioconvert ! queue ! i.
>
> but this does not:
>
> gst-launch-0.10 -v interleave name=i ! queue ! \
> vorbisenc ! vorbisdec ! \
> jackaudiosink connect=none \
> jackaudiosrc ! audioconvert ! queue ! i. \
> jackaudiosrc ! audioconvert ! queue ! i. \
> jackaudiosrc ! audioconvert ! queue ! i. \
> jackaudiosrc ! audioconvert ! queue ! i.
>
> Do you know why? The vorbis spec allows for 255 channels and I simply 
> would like to run n channels through the vorbis encoder ...
>
> I really could use some help.
>
> Thanks in advance, Dirk
>
>
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-- 
Tristan Matthews
Société des arts technologiques [SAT]
email: tristan at sat.qc.ca
web: http://www.music.mcgill.ca/~tmatthews