Re: Loopback latency issue
Måns Rullgård <[email protected]>
| Newsgroups | gmane.comp.audio.sox |
|---|---|
| Message-ID | <[email protected]> |
Maxim Doumkine <[email protected]> writes: > Hello everyone, > > We are trying to build a Sox based real-time sound altering app, and we’ve > got everything working on our LUbuntu 16.04 stations except for an issue w > latency. > > When we test it on actual hardware, we are having a latency of about 2 > seconds, when we test it on our virtual machine the latency is more like > 250ms. > > sox -t pusleaudio default -t pulseaudio null pitch n > Whenever we add the null loopback or aloop, we experience a delay. No amount > of config tinkering seems to affect this latency on an actual workstation. The first thing I'd do is get rid of pulseaudio and access the ALSA device directly. Even then, however, there are several places where latency is added. You can find the ALSA buffer sizes currently uses by examining /proc/asound/card0/pcm0p/sub0/hw_params (or whatever numbers your system uses). The size (in bytes) of the main buffer in SoX is set with the --buffer option. Some effects have additional internal buffers. -- Måns Rullgård _______________________________________________ Sox-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sox-users