> Hi! PulseEffects developer here again. > > Like the title says I'd like to know if rewinds can cause crackling noises > when we are recording from a null sink monitor. Yes it can: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/304 > In PulseEffecs I use the > plugin pulsesrc from GStreamer to record the null sink monitor and whenever > there is a change in the null sink volume or in the volume of a sink input > playing to the null sink I can here noises. Looking at Pulseaudio's logs I > can see lines with: > > [null-sink] module-null-sink.c: Requested to rewind 3528 bytes. > [null-sink] sink.c: Processing rewind... > [null-sink] sink-input.c: Have to rewind 2840 bytes on render memblockq. > [null-sink] sink-input.c: Have to rewind 1420 bytes on implementor. > [null-sink] source.c: Processing rewind... > [null-sink] module-null-sink.c: Rewound 2840 bytes. > [pulseaudio] module-stream-restore.c: Storing volume/mute/device for stream > sink-input-by-media-role:music. > [pulseaudio] protocol-native.c: Client spotify changes volume of sink input > Spotify. > > whenever the application volume is changed. At the same time they are shown > I can hear cracklings. So it seems related. I noticed that forcing pulsesrc > to use lower latencies help but do not fix the problem. Changing volumes > with pulsesrc latency-time parameter set to 1000 us produces less noises > than when it is set to 10000 us. > > I tried my best to see if there is anything I can do on my side to remove > this noise I found nothing. Is that how things are or is there anything > that can be done to remove this noises? This is how things are. It would be great if someone would have a hard look at the monitor source rewinding code and see what goes wrong there.
Although a little annoying in my opinion this is not the end of the world. The null sink reconfigure feature will be much more useful.
Best regards,
Wellington
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Prof.° Wellington Wallace Miguel Melo
CEFET/RJ Uned Nova Iguaçu
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