https://bugs.freedesktop.org/show_bug.cgi?id=80770
--- Comment #12 from [email protected] --- (In reply to comment #7) > Can you attach a verbose log for a run where you just load module-loopback > with latency_msec=1, so that we can figure out if the sink is really not > using timer-based scheduling? Here are instructions: > https://wiki.ubuntu.com/PulseAudio/Log > > Looping back the audio with pacat shouldn't have any lower latency, unless > the sink is slow to start so some audio gets received from the source before > the sink starts to consume it (module-loopback doesn't handle that case > well, a known issue). Thank you for your response. I've generated the preceding log using the instructions provided at your link. I loaded module-loopback with latency_msec=1, first, and then I unloaded it and re-loaded it with latency_msec=1000, both of which sound like the same latency, to me. When I pacat my input to my output, both pacat's running with a specified 1ms latency, the latency is much less than when using module-loopback, perhaps for the reason that you provided. On the other hand, when I run the pacat's with 1000 msec or more of latency, I can actually delay the sound by seconds at a time, which is what I would expect. This doesn't appear to be possible with module-loopback; specifying large latencies up to 2000ms (the maximum supported latency, according to the manual) appears to have no effect on the latency, which stays the same as latency_msec=1. -- You are receiving this mail because: You are the QA Contact for the bug. You are the assignee for the bug.
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