[gst-devel] One microphone, recording mono fails

[Viraj Karandikar]

Hi,
I dont see any issue in using audioconvert.
Did you see the log by setting debug level to 5?
When exactly "Could not negotiate format" error is coming? it might give
some clue on whats happening.

-Viraj

On Tue, Sep 29, 2009 at 5:55 PM, Jan Martinek <honza at dp.fce.vutbr.cz> wrote:

> 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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-- 
- Viraj
Reality is merely an illusion, albeit a very persistent one.
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