https://bugs.freedesktop.org/show_bug.cgi?id=99689
Bug ID: 99689
Summary: Recording from monitor has glitches when playing other
sounds.
Product: PulseAudio
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: core
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected]
Created attachment 129350
--> https://bugs.freedesktop.org/attachment.cgi?id=129350&action=edit
tgz containing sine.wav, silence.wav, recorded.wav
Attached in the .tar.gz are 3 files:
- sine.wav: 30-second sine wave
- silence.wav: 0.1-second silence
- recorded.wav: the glitched recorded result.
How to reproduce:
- run:
paplay sine.wav
- While the sine wave is playing, in another terminal run:
parec -d $MONITOR --file-format=wav > recorded.wav
where $MONITOR is your monitor device, in my case it's
alsa_output.pci-0000_00_1f.3.analog-stereo.monitor
- While recording, in another terminal run:
paplay silence.wav
- stop parec with Control+C
- stop the paplay sine.wav
- Listen to recorded.wav: you should hear glitches similar to my recorded.wav.
The sine wave plays, but really short periods of silence are inserted.
Some more interesting things:
- If you play silence.wav many times, you get more glitches in the recording.
Every play seems to trigger 1-2 glitches.
- Any sound playing triggers the glitches - system sounds for example.
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