[gst-devel] One microphone, recording mono fails

[Jan Martinek]

Hi,

this is interesting, thank you. But is it a recommended, clean solution 
or just workaround?

I have tried mono recording on a different (older) computer and it works 
fine there. Relevant line from "lspci" is this:

00:11.5 Multimedia audio controller: VIA Technologies, Inc. 
VT8233/A/8235/8237 AC97 Audio Controller (rev 50)

On the other hand, one channel recording fails on my computer with
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)

Does it depend on hardware? Do capabilities differ? I would be 
surprised, because this seems to me as very basic functionality.

Thank you,
Jan Martinek

On 09/29/2009 01:57 PM, Viraj Karandikar wrote:
> Hi,
> You can capture 2 channels and then use audioconvert to convert it to
> mono channel.
> gst-launch gconfaudiosrc ! capsfilter \
> caps=audio/x-raw-int,rate=44100,channels=2,depth=16 ! \
> audioconvert !
> audio/x-raw-int,rate=8000,depth=16,channels=1,width=16,signed=\(boolean\)TRUE,endianness=\(int\)1234
> ! wavenc ! filesink location=test.wav
> regards,
> Viraj
>
> On Tue, Sep 29, 2009 at 4:53 PM, Jan Martinek <honza at dp.fce.vutbr.cz
> <mailto:honza at dp.fce.vutbr.cz>> wrote:
>
>     Hello,
>
>     I am unable to record only one channel (mono). I have only one
>     microphone attached to sound card. But if I run this
>
>     gst-launch gconfaudiosrc ! capsfilter \
>     caps=audio/x-raw-int,rate=44100,channels=1,depth=16 ! \
>     wavenc ! filesink location=test.wav
>
>     then I get this error message:
>
>     Setting pipeline to PAUSED ...
>     ERROR: Pipeline doesn't want to pause.
>     ERROR: from element
>     /GstPipeline:pipeline0/GstGConfAudioSrc:gconfaudiosrc0/GstBin:bin0/GstAlsaSrc:alsasrc0:
>     Could not negotiate format
>     Additional debug info:
>     gstbasesrc.c(2584): gst_base_src_start ():
>     /GstPipeline:pipeline0/GstGConfAudioSrc:gconfaudiosrc0/GstBin:bin0/GstAlsaSrc:alsasrc0:
>     Check your filtered caps, if any
>     Setting pipeline to NULL ...
>     Freeing pipeline ...
>
>
>     It can be solved if I use two channels for recording, so this
>
>     gst-launch gconfaudiosrc ! capsfilter \
>     caps=audio/x-raw-int,rate=44100,channels=2,depth=16 ! \
>     wavenc ! filesink location=test.wav
>
>     works fine. But I would like to record one channel because further data
>     processing is little easier.
>
>     Thank you
>     Jan Martinek
>
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>
>
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