[pulseaudio-tickets] [Bug 99058] New: combine-sink: Very high buffer latency (sometimes)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99058

            Bug ID: 99058
           Summary: combine-sink: Very high buffer latency (sometimes)
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: klausenbusk at hotmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Created attachment 128418
  --> https://bugs.freedesktop.org/attachment.cgi?id=128418&action=edit
custom /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf

Hello

We sell digital signage boxes, and therefor have a Linux image which need to
work on most hardware without the customer need to configure anything.

To ensure that, we have a custom default.conf profile-set, which ensure that:
hdmi-stereo hdmi-stereo-extra1 hdmi-stereo-extra2 is split out as 3 different
sinks, and we then use module-combine-sink to send audio to all the sinks.
It work most of the time, but sometimes (often the first time Pulseaudio is
started after boot) the sound is "lagging"/sounding totally wrong (not sure how
to explain it) and the module is printing errors like:

D: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo] total=63902.33ms sink=367.18ms
W: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo] Total latency of output is very high
(63902.33ms), most likely the audio timing in one of your drivers is broken.
D: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo-extra1] total=359.95ms sink=359.95ms
D: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo-extra2] total=63902.00ms
sink=366.72ms
W: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo-extra2] Total latency of output is
very high (63902.00ms), most likely the audio timing in one of your drivers is
broken.
D: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_1b.0.analog-stereo] total=63902.01ms sink=366.50ms
W: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_1b.0.analog-stereo] Total latency of output is very
high (63902.01ms), most likely the audio timing in one of your drivers is
broken.
I: [pulseaudio] module-combine-sink.c: [combined] avg total latency is 48016.57
msec.
I: [pulseaudio] module-combine-sink.c: [combined] target latency is 367.18
msec.
W: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo] sample rates too different, not
adjusting (44100 vs. 324289).
I: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo-extra1] new rate of 44069 Hz not
within 2‰ of 43877 Hz, forcing smaller adjustment
I: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo-extra1] new rate is 43964 Hz; ratio
is 0.997; latency is 359.95 msec.
W: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_03.0.hdmi-stereo-extra2] sample rates too different,
not adjusting (44100 vs. 324288).
W: [pulseaudio] module-combine-sink.c:
[alsa_output.pci-0000_00_1b.0.analog-stereo] sample rates too different, not
adjusting (44100 vs. 324288).

This also cause Firefox (which is the only application running) videos to
stutter.

If I open pavucontrol and switch default-sink to any of the other sinks the
video start playing normally again as it should and the audio sounds normally.

I have debugged a little, and noticed that "pacmd list-sinks" only show a high
(71350.68 ms) "current latency" for the combined sink, and "pactl list
sink-inputs" show a very high (94875147 usec) "Buffer Latency" for any of the
combine input.

alsa-info:
http://www.alsa-project.org/db/?f=d31c9a34dcac7629a572d54c5affd3068074c8e2

Regards
Kristian Klausen

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