[pulseaudio-tickets] [Bug 66426] New: Recording a monitor when nothing is playing results in 2 seconds of extra silence

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66426

          Priority: medium
            Bug ID: 66426
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: Recording a monitor when nothing is playing results in
                    2 seconds of extra silence
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: maarten-baert at hotmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: core
           Product: PulseAudio

When I record a monitor when nothing is playing, my application always receives
2 seconds of silence during the first few milliseconds. I assume this is sound
from the past, but I can't tell because it's just silence. This behaviour
creates problems in my application, and I suppose in other applications as
well.

My application deals with both audio and video, and the unexpected extra two
seconds of audio are more than enough to desynchronize the audio and the video.
I am now working around this by dropping all audio frames that I receive within
the first 100ms, but this is clearly not ideal.

This does not happen when there is anything playing. It also doesn't happen
when I record the microphone.

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