[gst-devel] One microphone, recording mono fails

[Jan Martinek]

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