[pulseaudio-discuss] Multicast RTP synchronization

[Sergio Serrano]

Dear all

I've been using Pulseaudio for a while and I can see periodically messages
on the log like:

D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updating
sample rate
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Write
index deviates by 395.06 ms, expected 500.00 ms
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Estimated
target rate: 44038 Hz, using average of 44067 Hz  (=0.020)
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updated
sampling rate to 43836 Hz.
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updating
sample rate
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Write
index deviates by 430.94 ms, expected 500.00 ms
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Estimated
target rate: 44153 Hz, using average of 44069 Hz  (=0.020)
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updated
sampling rate to 43916 Hz.
D: [pulseaudio] module-rtp-recv.c: Checking for dead streams ...
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updating
sample rate
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Write
index deviates by 448.92 ms, expected 500.00 ms
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Estimated
target rate: 44074 Hz, using average of 44073 Hz  (=0.800)
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updated
sampling rate to 43960 Hz.
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Updating
sample rate
D: [alsa-sink-Carambola2 audio wm8727-hifi-0] module-rtp-recv.c: Write
index deviates by 468.25 ms, expected 500.00 ms

Basically the two receivers are out of sync (from +20mS to -20mS)
Please, someone can help me in order to debug further this issue? I'm using
a MIPS cpu AR9331 with openwrt distro on it.
Any help or clue will be welcomed.

Regards,
Sergios
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