<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> I think this is just defaulting to your HW capabilities. Use –v to see whats happening.<o:p></o:p> <o:p> </o:p> examples on my machine, <o:p></o:p> gst-launch -v alsasrc device=hw:1 ! audioconvert ! alsasink device=hw:1<o:p></o:p> gst-launch -v alsasrc device=hw:0 ! audioconvert ! alsasink device=hw:0<o:p></o:p> <o:p> </o:p> produce differing numbers of source channels. I suspect your older computer only has one channel.<o:p></o:p> <o:p> </o:p> >LAUNCH 1<o:p></o:p> /pipeline0/alsasrc0.src: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)48000, channels=(int)1<o:p></o:p> …….          <o:p></o:p> /pipeline0/audioconvert0.src: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)48000, channels=(int)2<o:p></o:p> /pipeline0/audioconvert0.sink: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)48000, channels=(int)1<o:p></o:p> /pipeline0/alsasink0.sink: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)48000, channels=(int)2<o:p></o:p> <o:p> </o:p> >LAUNCH 2<o:p></o:p> pipeline0/alsasrc0.src: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2<o:p></o:p> ….<o:p></o:p> /pipeline0/audioconvert0.src: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2<o:p></o:p> /pipeline0/audioconvert0.sink: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2<o:p></o:p> New clock: GstAudioSrcClock<o:p></o:p> /pipeline0/alsasink0.sink: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2/<o:p></o:p> <o:p> </o:p> I can do <o:p></o:p> gst-launch -v alsasrc device=hw:0 ! alsasink device=hw:0<o:p></o:p> <o:p> </o:p> but not<o:p></o:p> gst-launch -v alsasrc device=hw:1 ! alsasink device=hw:1<o:p></o:p> as I need to modify the number of channels, I need the audioconvert for this one!<o:p></o:p> <o:p> </o:p> <o:p> </o:p> <div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'> From: Viraj Karandikar [mailto:virajk@gmail.com] Sent: 29 September 2009 14:13 To: Discussion of the development of GStreamer Subject: Re: [gst-devel] One microphone, recording mono fails<o:p></o:p> </div> <o:p> </o:p> <div> Hi,<o:p></o:p> </div> <div> I dont see any issue in using audioconvert.<o:p></o:p> </div> <div> Did you see the log by setting debug level to 5?<o:p></o:p> </div> <div> When exactly "Could not negotiate format" error is coming? it might give some clue on whats happening.<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> -Viraj<o:p></o:p> </div> <div> On Tue, Sep 29, 2009 at 5:55 PM, Jan Martinek <<a href="mailto:honza@dp.fce.vutbr.cz">honza@dp.fce.vutbr.cz</a>> wrote:<o:p></o:p> 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<o:p></o:p> <div> 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 <<a href="mailto:honza@dp.fce.vutbr.cz">honza@dp.fce.vutbr.cz</a><o:p></o:p> </div> <div> <div> > <mailto:<a href="mailto:honza@dp.fce.vutbr.cz">honza@dp.fce.vutbr.cz</a>>> 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 > >     ------------------------------------------------------------------------------ >     Come build with us! The BlackBerry&reg; Developer Conference in SF, CA >     is the only developer event you need to attend this year. Jumpstart your >     developing skills, take BlackBerry mobile applications to market and >     stay >     ahead of the curve. Join us from November 9&#45;12, 2009. Register >     now&#33; >     <a href="http://p.sf.net/sfu/devconf" target="_blank">http://p.sf.net/sfu/devconf</a> >     _______________________________________________ >     gstreamer-devel mailing list >     <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a><o:p></o:p> </div> </div> >     <mailto:<a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a>><o:p></o:p> <div> >     <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> > > > > > -- > - Viraj > Reality is merely an illusion, albeit a very persistent one. > ><o:p></o:p> </div> > ------------------------------------------------------------------------<o:p></o:p> <div> <div> > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry&reg; Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9&#45;12, 2009. Register now&#33; > <a href="http://p.sf.net/sfu/devconf" target="_blank">http://p.sf.net/sfu/devconf</a> > > > ------------------------------------------------------------------------ > > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> > <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> ------------------------------------------------------------------------------ Come build with us! The BlackBerry&reg; Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9&#45;12, 2009. Register now&#33; <a href="http://p.sf.net/sfu/devconf" target="_blank">http://p.sf.net/sfu/devconf</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a><o:p></o:p> </div> </div> </div> <o:p></o:p> -- - Viraj Reality is merely an illusion, albeit a very persistent one.<o:p></o:p> </div> </body> </html>