Bug#634842: pulseaudio: Logitech C250 Webcam microphone works with wrong sample rate

[Dmitry A. Istselemov]

Package: pulseaudio
Severity: normal

Logitech C250 Webcam microphone works with wrong sample rate in pulseaudio. All
records making with this microphone sounds very fast. Pulseaudio recognize this
mic as one having 48000Hz sample rate. In fact I beleive it should be 16000Hz.
The webcam is connected using USB interface. At first it appeard in Skype (and
in Skype it doesn't work even now neither with nor without pulse). The
workaround for this was making an asound.conf with the next lines:

pcm.skype {
type plug
slave {
pcm "hw:1,0"
rate 16000
}
}
removing pulseaudio and using this plug device as an input device for skype.

But checking the microphone by executing "arecord -D plughw:1,0 -vv
RecTest.wav" and then playing the record shew that it worked fine. The sound
was good and everything was fine with the speech speed. Actually I can't
understand why the mic doesn't work in skype but works great in all the other
programs (I used audacity and the above arecord line for testing) when I'm
using alsa only? And why it makes just noise (speech with very fast speed)
everywhere when I'm using pulse? This problem also exist when I use native
2.6.39 debian kernel.

-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (990, 'testing'), (900, 'testing-proposed-updates'), (101, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.39-3.dmz.2-liquorix-amd64 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

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[Felipe Sateler]

Hi Dmitri,

On Wed, Jul 20, 2011 at 06:58:20PM +0500, Dmitry A. Istselemov wrote:
> Package: pulseaudio
> Severity: normal
>
> Logitech C250 Webcam microphone works with wrong sample rate in pulseaudio. All
> records making with this microphone sounds very fast. Pulseaudio recognize this
> mic as one having 48000Hz sample rate. In fact I beleive it should be 16000Hz.
> The webcam is connected using USB interface. At first it appeard in Skype (and
> in Skype it doesn't work even now neither with nor without pulse). The
> workaround for this was making an asound.conf with the next lines:
>
> pcm.skype {
> type plug
> slave {
> pcm "hw:1,0"
> rate 16000
> }
> }
> removing pulseaudio and using this plug device as an input device for skype.
>
> But checking the microphone by executing "arecord -D plughw:1,0 -vv
> RecTest.wav" and then playing the record shew that it worked fine. The sound
> was good and everything was fine with the speech speed. Actually I can't
> understand why the mic doesn't work in skype but works great in all the other
> programs (I used audacity and the above arecord line for testing) when I'm
> using alsa only? And why it makes just noise (speech with very fast speed)
> everywhere when I'm using pulse? This problem also exist when I use native
> 2.6.39 debian kernel.

You reported this bug a long time ago, and the problem might have been
fixed since then.

Can you still reproduce this issue? If so, please reply so we can debug
the problem, otherwise I'd like to close this bug.

Thanks

--
Saludos,
Felipe Sateler

[Dmitriy Istselemov]

13.04.2014 05:06, Felipe Sateler пишет:

Hello,
Sorry but I'm not a Debian user any more. Nevertheless, as I remember
this bug was connected with the kernel itself (found it somewhere in red
hat, fedora or even kernel mailing lists) and it disappeared after the
next kernel upgrade (version 3.xx). Since that I haven't come across
this bug any more. Everything was OK with pulseaudio version 3 and 4.


--
С уважением,
Исцелемов Дмитрий Александрович

With best regards,
Dmitriy Istselemov