Bug#723924: linphone: Choppy audio when playback and record sound devices are not, clocked by the same oscillator

Vladimir Chernyshov vchernys at welho.com
Sat Sep 21 10:17:30 UTC 2013


Package: linphone
Version: 3.5.2-10
Severity: important
Tags: upstream

Dear Maintainer,

If linphone is configured to record sound from one sound card (e.g. from
a mike on a USB webcam), and to play back received stream to another
card (e.g. to the motherboard's built-in sound card's PCM output), the
audio periodically - every 1-2 minutes - becomes significantly chopped,
down to making the correspondant's voice unintelligible. Disabling dmix
in ALSA does not affect the problem. All codecs are affected, with
wideband speex becoming the most distorted during the attacks. If
recording and playback is on the same sound card with a single
oscillator, the problem does not occur.

Best regards,
Vladimir

-- System Information:
Debian Release: 7.1
   APT prefers stable-updates
   APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 3.2.0-4-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_DK.UTF-8, LC_CTYPE=en_DK.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages linphone depends on:
ii  libasound2          1.0.25-4
ii  libatk1.0-0         2.4.0-2
ii  libavcodec53        6:0.8.6-1
ii  libavutil51         6:0.8.6-1
ii  libc6               2.13-38
ii  libcairo2           1.12.2-3
ii  libfontconfig1      2.9.0-7.1
ii  libfreetype6        2.4.9-1.1
ii  libgdk-pixbuf2.0-0  2.26.1-1
ii  libglib2.0-0        2.33.12+really2.32.4-5
ii  libgsm1             1.0.13-4
ii  libgtk2.0-0         2.24.10-2
ii  liblinphone4        3.5.2-10
ii  libmediastreamer1   3.5.2-10
ii  libogg0             1.3.0-4
ii  libortp8            3.5.2-10
ii  libpango1.0-0       1.30.0-1
ii  libspeex1           1.2~rc1-7
ii  libspeexdsp1        1.2~rc1-7
ii  libswscale2         6:0.8.6-1
ii  libtheora0          1.1.1+dfsg.1-3.1
ii  libx11-6            2:1.5.0-1+deb7u1
ii  libxv1              2:1.0.7-1+deb7u1
ii  linphone-nogtk      3.5.2-10

linphone recommends no packages.

Versions of packages linphone suggests:
pn  yelp  <none>

-- no debconf information



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