I am running my tests using Armbian distro with kernel 5.9.16 on a Rock Pi 4A.
Both tests scripts (run_test and run_latency_test) run okay.
However, I'm getting strange oscillation issues in the audio that occur intermittently.
My setup is audio generator into an AES67 node and the AES67 stream is being received by the AES67 daemon running on the Rock Pi. I'm running alsaloop on it, and sending the source stream back to the node and listening to the output.
Everything works fine most of the time, but then occasionally (could be hours, could be minutes) there will be a strange oscillation in the audio.
This oscillation/distortion passes after a few seconds or a few dozen seconds and then everything is back to normal. Until the next time that it happens... See attached image.
The tick is set to 48 - 1ms and sink buffer is at 192 - 4ms (though I've tried other buffer sizes, with no effect - the issue still happens).
Any idea what is the problem and how can I troubleshoot why is this happening?