audio glitches when audio sinks are synchronized to GstSystemClock

[Charlie Laub]

Hi Pavel,

The client uses two alsasinks (two stereo DACs). The full pipeline is given earlier in this thread. There were audible glitches when both alsasinks had no sync parameter specified, so the value for sync was the default value, which is sync=true. 

After I explicitly set sync=false for both alsasinks, the glitches went away. That is the only change I made to the pipeline.

-Charlie

-----Original Message-----
From: gstreamer-devel <gstreamer-devel-bounces at lists.freedesktop.org> On Behalf Of Pavel Hofman
Sent: Monday, March 26, 2018 11:52 PM
To: Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org>; Charlie Laub <charleslaub at sbcglobal.net>
Subject: Re: audio glitches when audio sinks are synchronized to GstSystemClock

Hi Charlie,

Congrats on solving this issue, it is very useful. But I do not understand the change you did. Did you originally have more alsasinks, some with and some without the sync=false config?

Thanks,

Pavel.

Dne 26.3.2018 v 20:57 Charlie Laub napsal(a):
> I believe I have finally solved this problem.
> 
> PROBLEM RECAP:
> 
> Streaming over LAN to client, on client pipeline ends at an alsasink. 
> Client clock source was forced to GstSystemClock by setting 
> provide-clock=false on sink(s). When I also set slave-method=resample 
> or slave-method=skew I would get audible glitches. With skew it was a 
> tick or pop sound, and with resample occasionally the pitch would go 
> up and down for several to several tens of seconds, like “wow and 
> flutter” if anyone remembers what this is…
> 
> FIX:
> 
> I set sync=false on all alsasinks. Since then (several days of 
> auditioning ago) the audible glitches have disappeared.
> 
> Not sure why exactly this is fixing the problem, but I thought I would 
> leave a note about it here for posterity.
> 
> 
> 
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