alsasrc and caps negotiation

[Nox Deleo]

I'd suggest getting a debug graph of this. It should help you see what caps
are being used where.

See here for instructions:
http://gstreamer.freedesktop.org/wiki/DumpingPipelineGraphs

Also, see these instructions on debugging to get more verbose messages that
may help pinpoint your problem:
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-checklist-debug.html

I've just been doing some work with ALSA and GStreamer, and I ended up
writing a custom ALSA config file to split up my sound cards 8 ins and outs
into different devices, so I could access them with separate alsasrc/sink
elements. I found it alot easier than dealing with interleaving and channel
positions. I don't know what you're trying to do exactly, but that's always
an option if you need it.


On 2 February 2013 00:22, Gary Thomas <gary at mlbassoc.com> wrote:

> I'm experimenting with audio streaming, based on this example:
>   http://cgit.freedesktop.org/**gstreamer/gst-plugins-good/**
> tree/tests/examples/rtp/**server-alsasrc-PCMA.sh<http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/tests/examples/rtp/server-alsasrc-PCMA.sh>
>
> When paired with the appropriate client, I can run it fine when the
> audio source is 'audiotestsrc'.  If I change it to be 'alsasrc', I
> get incompatible caps and it fails.  This seems to be because the
> rtppcmapay element only wants one channel.
>
> I've not been able to figure out how to select only one channel
> of my ALSA source, either by mixing or just choosing one or the
> other.  Here's what I tried that now doesn't complain about the
> caps being wrong (but I'm sure the issue remains), rather it gives
> me an "internal data flow error"
>
>   gst-launch -vvv gstrtpbin name=rtpbin alsasrc device=hw:0,1 \
>     ! deinterleave name=d d.src0 ! queue ! audioconvert \
>     ! alawenc ! rtppcmapay ! rtpbin.send_rtp_sink_0 \
>      rtpbin.send_rtp_src_0 ! udpsink port=5002 host=192.168.1.114 \
>      rtpbin.send_rtcp_src_0 ! udpsink port=5003 host=192.168.1.114
> sync=false async=false \
>     udpsrc port=5007 ! rtpbin.recv_rtcp_sink_0
>
> Any suggestions on how I make this happy?
>
> Thanks
>
> --
> ------------------------------**------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
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