Farstream call: delay on incoming audio

[Nicolas Dufresne]

Le jeudi 14 juin 2018 à 16:52 +0100, David Woodhouse a écrit :
> Using the Amazon Chime plugin for Pidgin
> (https://github.com/awslabs/pidgin-chime) I am seeing strange behaviour
> with audio calls.
> 
> The longer Pidgin has been running, the longer it takes before I
> receive incoming audio, after joining a call. There's normally a
> "bleep" when you join a call. Unless you've *recently* started Pidgin,
> you don't hear that. It gets to the point where Pidgin eats CPU (in the
> liveadderX:src and queue:src threads IIRC) for 30-40 seconds before you
> ever hear anything. Meanwhile, inbound audio is working fine.

Can you try and set property "start-time-selection" on liveadder /
audiomixer to (1): first. I think the liveadder shm is not setup
properly and will cause regressions like this.

> 
> Here's the pipeline graph of a sample call:
> http://david.woodhou.se/chimegraph-20180614.svg
> 
> Output of the following command:
> $ CHIME_DEBUG=1 GST_DEBUG_DUMP_DOT_DIR=/tmp GST_DEBUG=5,audiomixer:9,GST_SCHEDULING:9,appsrc:9,rtpjitterbuffer:9  /opt/pidgin2/bin/pidgin -d
> 
> ... is at http://david.woodhou.se/chimelog-20180614.txt
> 
> I join the call at around 00:00:27 and start receiving audio frames
> (which are fed into the appsrc):
> 
> Audio RX seq 1736 ts 131819330
> 
> But I don't actually hear anything until a couple of seconds later. I
> think this line is about the time I start hearing anything in my
> headset:
> 
> 0:00:29.904593304 17809 0x7f440400b1e0 DEBUG          audiobasesink gstaudiobasesink.c:2155:gst_audio_base_sink_render:<pulsesink0> rendering at 5434 480/480
> 
> Prior to that, pulsesink seems to be dropping frames.
> 
> Of course, I'm not sure if what I'm looking at here is the same thing
> I've seen without the debugging. This one could just be an aspect of
> "debug makes it slow".... any clues on how to work it out would be very
> much appreciated!
> 
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