[pulseaudio-discuss] audio video out of sync

[Tanu Kaskinen]

On Tue, 2014-02-18 at 11:04 +0200, Tanu Kaskinen wrote:
> On Tue, 2014-02-18 at 04:51 +0100, Malte Gell wrote:
> > Am 16.02.2014 12:24, schrieb Tanu Kaskinen:
> > 
> > > On the topic of audio/video sync, synchronization requires accurate
> > > latency information. PulseAudio doesn't have that information. If the
> > > audio lags by a constant amount all the time, then you can work around
> > > the problem by configuring the latency offset with e.g. pavucontrol.
> > 
> > Thanks for the explanation.
> > 
> > The audio lags do not occur all the time, they occur after some time,
> > often audio totally quits, when waiting a while audio comes back again.
> > 
> > /var/log/messages gets flooded with these errors:
> > 
> > [bluetooth] module-bluetooth-device.c: Skipping 412706 us (= 72800
> > bytes) in audio stream
> > [bluetooth] module-bluetooth-device.c: Skipping 465700 us (= 82148
> > bytes) in audio stream
> > [bluetooth] module-bluetooth-device.c: Skipping 154683 us (= 27284
> > bytes) in audio stream
> > [bluetooth] module-bluetooth-device.c: Skipping 126688 us (= 22344
> > bytes) in audio stream
> > [bluetooth] module-bluetooth-device.c: Skipping 70714 us (= 12472 bytes)
> > in audio stream
> > 
> > Do these message give a hint where the problems come from?
> 
> The messages indicate that the kernel is accepting audio from PulseAudio
> slower than what is required for smooth playback. I would guess that the
> problem is interference in the radio signal that prevents reliable
> communication.

I forgot to mention - these messages do not give any hints about why the
latency is increasing, that is, which buffer is getting bigger.

-- 
Tanu