[gst-devel] pulsesrc/pulsesink clocking issues

[Alexey Chernov]

Thanks, Wim, although not good news... And will queue or some other buffer 
elements help this? Any normal delays won't hurt too much.

В сообщении от Среда 07 июля 2010 16:56:34 вы написали:
> On Wed, 2010-07-07 at 16:18 +0400, 4ernov wrote:
> > Hello,
> > I experience some issues when trying to process sound from pulsesrc
> > and pulsesink elements. The pipeline is quite simple:
> > 
> > pulsesrc device=insert.monitor ! equalizer-nbands ! pulsesink
> > device=output
> > 
> > "insert" device in Pulseaudio is module-null-sink device and "output"
> > device is module-alsa-sink device. In PA list I was suggested that
> > this problem could be clocking and synchronizing issue between system
> > and ALSA clocks. It seems to be right because I got the message
> > 
> > baseaudiosink
> > gstbaseaudiosink.c:1035:gst_base_audio_sink_skew_slaving:<pulsesink0>
> > correct clock skew 20191929 > 20000000
> > 
> > on every click in sound stream (very much of such messages).
> > 
> > I think it can be solved by setting ALSA clock as master for the whole
> > pipeline. Is it possible? Is there any way at all to solve such a
> > problem?
> 
> Not possible. If there are two devices with different clocks, one of
> them needs to compensate for the drift. Currently this is done by
> dropping samples or inserting silence when the drift is bigger than
> 20ms.
> 
> Another less audible way would be to resample the audio. Unfortunately
> the stability of the resampler is not so good in the gstreamer elements
> so it sounds quite bad (you can try with the slave-method property on
> pulsesink).
> 
> Wim
> 
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