Low latency audio capture with gstreamer

Question

I need (almost) real-time audio capturing on Linux with gstreamer. My problem is that I cannot reduce the latency below ~210ms. I tried a simple loopback from mic to headphone:

gst-launch-1.0 pulsesrc ! alsasink
gst-launch-1.0 alsasrc ! alsasink

Both produced the same delay. The latency-time property of alsasrc did not help (it did add the given latency). I could produce the effect I need with

pactl load-module module-loopback latency_msec=1

But I could not figure out whether it is possible to set the device latency for the pulsesrc plug-in of gstreamer. I guess, if it is possible, I should add something to the stream-properties, but could not figure out what (I searched for it here) and how.

Is it possible to set this device latency for any gstreamer sources, and if yes, how?

Answer 1

Using pulsesink instead of alsasink may solve the problem. Try this:

gst-launch-1.0 -v alsasrc buffer-time=35000 !  pulsesink