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. 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? Best regards, Wellington -- Prof.° Wellington Wallace Miguel Melo CEFET/RJ Uned Nova Iguaçu
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