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[Linphone-users] Re: Garbled, digital audio on embedded linux (gumstix)

From: John Swarbrick
Subject: [Linphone-users] Re: Garbled, digital audio on embedded linux (gumstix)
Date: Fri, 21 Jan 2011 21:34:06 +0000 (GMT)

I've found that recording to file and then playing the file back with aplay 
produces decent audio.

So I'm only getting garbled audio when linphone tries to play direct through 
the ALSA soundcard.

When I startup linphonec, it prints this message:

address@hidden:~# linphonec -a    
ALSA lib conf.c:4600:(snd_config_expand) Unknown parameters 0
ALSA lib control.c:902:(snd_ctl_open_noupdate) Invalid CTL default:0
Warning: video is disabled in linphonec, use -V or -C or -D to enable.
linphonec> Registration on sip:asterisk successful.

Does this indicate the problem? Is there anything else I can do to debug this?



--- On Thu, 20/1/11, John Swarbrick <address@hidden> wrote:

> From: John Swarbrick <address@hidden>
> Subject: Garbled, digital audio on embedded linux (gumstix)
> To: address@hidden
> Date: Thursday, 20 January, 2011, 23:09
> Hi all,
> I have linphonec 3.3.2 running on a gumstix (angstrom) with
> alsa sound drivers.
> I can play soundfiles with aplay through the speakers which
> sound normal, but when I make a call to linphone the audio
> is unreadable.
> The best way I can describe the sound is like a loud
> digital chopping noise, with extremely faint voice in the
> background.
> Calling another linphone running on a traditional laptop
> with Ubuntu works fine, so the problem isn't the calling
> client or the pbx (Asterisk). This is on WiFi.
> Does anyone have any ideas what this could be? I'm tearing
> my hair out as this is probably something really simple!
> Thanks,
> John

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