* Loopback latency issue [not found] <0713c9d8-7bdf-4b97-99b4-12e219e94d45@Spark> @ 2020-07-10 17:40 ` Maxim Doumkine 2020-07-10 18:08 ` Darryl Lewis ` (2 more replies) 0 siblings, 3 replies; 11+ messages in thread From: Maxim Doumkine @ 2020-07-10 17:40 UTC (permalink / raw) To: sox-users [-- Attachment #1.1: Type: text/plain, Size: 681 bytes --] 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. We’d appreciate an advice or any input but would be equally glad to hire a consultant for a fee to get this resolved. Thank you. [-- Attachment #1.2: Type: text/html, Size: 1023 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] [-- Attachment #3: Type: text/plain, Size: 158 bytes --] _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-10 17:40 ` Loopback latency issue Maxim Doumkine @ 2020-07-10 18:08 ` Darryl Lewis 2020-07-11 16:04 ` Maxim Doumkine 2020-07-11 13:12 ` Måns Rullgård 2020-07-13 11:49 ` Jan Stary 2 siblings, 1 reply; 11+ messages in thread From: Darryl Lewis @ 2020-07-10 18:08 UTC (permalink / raw) To: sox-users@lists.sourceforge.net [-- Attachment #1.1: Type: text/plain, Size: 1099 bytes --] Is your virtual machine exactly the same (OS version) as your physical PC? It might be a driver issue with different versions. From: Maxim Doumkine <maxd@coregears.com> Reply to: "sox-users@lists.sourceforge.net" <sox-users@lists.sourceforge.net> Date: Saturday, 11 July 2020 at 3:58 am To: "sox-users@lists.sourceforge.net" <sox-users@lists.sourceforge.net> Subject: [SoX-users] Loopback latency issue 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. We’d appreciate an advice or any input but would be equally glad to hire a consultant for a fee to get this resolved. Thank you. [-- Attachment #1.2: Type: text/html, Size: 3539 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] [-- Attachment #3: Type: text/plain, Size: 158 bytes --] _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-10 18:08 ` Darryl Lewis @ 2020-07-11 16:04 ` Maxim Doumkine 0 siblings, 0 replies; 11+ messages in thread From: Maxim Doumkine @ 2020-07-11 16:04 UTC (permalink / raw) To: sox-users@lists.sourceforge.net, sox-users [-- Attachment #1.1: Type: text/plain, Size: 1411 bytes --] Yes it is an exact clone. On 10 Jul 2020, 21:09 +0300, Darryl Lewis <darryl.lewis@unsw.edu.au>, wrote: > > Is your virtual machine exactly the same (OS version) as your physical PC? > It might be a driver issue with different versions. > > > From: Maxim Doumkine <maxd@coregears.com> > Reply to: "sox-users@lists.sourceforge.net" <sox-users@lists.sourceforge.net> > Date: Saturday, 11 July 2020 at 3:58 am > To: "sox-users@lists.sourceforge.net" <sox-users@lists.sourceforge.net> > Subject: [SoX-users] Loopback latency issue > > 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. > > We’d appreciate an advice or any input but would be equally glad to hire a consultant for a fee to get this resolved. > > Thank you. > _______________________________________________ > Sox-users mailing list > Sox-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sox-users [-- Attachment #1.2: Type: text/html, Size: 3008 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] [-- Attachment #3: Type: text/plain, Size: 158 bytes --] _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-10 17:40 ` Loopback latency issue Maxim Doumkine 2020-07-10 18:08 ` Darryl Lewis @ 2020-07-11 13:12 ` Måns Rullgård 2020-07-11 15:59 ` Maxim Doumkine 2020-07-11 16:12 ` Steve Masters 2020-07-13 11:49 ` Jan Stary 2 siblings, 2 replies; 11+ messages in thread From: Måns Rullgård @ 2020-07-11 13:12 UTC (permalink / raw) To: Maxim Doumkine; +Cc: sox-users Maxim Doumkine <maxd@coregears.com> 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 Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-11 13:12 ` Måns Rullgård @ 2020-07-11 15:59 ` Maxim Doumkine 2020-07-11 16:12 ` Steve Masters 1 sibling, 0 replies; 11+ messages in thread From: Maxim Doumkine @ 2020-07-11 15:59 UTC (permalink / raw) To: Måns Rullgård; +Cc: sox-users [-- Attachment #1.1: Type: text/plain, Size: 648 bytes --] We’ve tried that with no effect. :-/ it’s curious how it doesn’t work on actual workstation but works fine on virtualized pc. On 11 Jul 2020, 16:12 +0300, Måns Rullgård <mans@mansr.com>, wrote: > > 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. [-- Attachment #1.2: Type: text/html, Size: 1067 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] [-- Attachment #3: Type: text/plain, Size: 158 bytes --] _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-11 13:12 ` Måns Rullgård 2020-07-11 15:59 ` Maxim Doumkine @ 2020-07-11 16:12 ` Steve Masters 1 sibling, 0 replies; 11+ messages in thread From: Steve Masters @ 2020-07-11 16:12 UTC (permalink / raw) To: sox-users [-- Attachment #1.1: Type: text/plain, Size: 1679 bytes --] I wonder if it's because the virtual pc doesn't have the same amount of processes running on it, nor physical data traffic, that your actual workstation has to deal with. Added to that, the memory available to it - not being used elsewhere - would improve perfoemance. Just my thinking. On Sat, 11 Jul 2020, 14:31 Måns Rullgård, <mans@mansr.com> wrote: > Maxim Doumkine <maxd@coregears.com> 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 > Sox-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sox-users > [-- Attachment #1.2: Type: text/html, Size: 2316 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] [-- Attachment #3: Type: text/plain, Size: 158 bytes --] _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-10 17:40 ` Loopback latency issue Maxim Doumkine 2020-07-10 18:08 ` Darryl Lewis 2020-07-11 13:12 ` Måns Rullgård @ 2020-07-13 11:49 ` Jan Stary 2020-07-13 12:05 ` Jan Stary ` (2 more replies) 2 siblings, 3 replies; 11+ messages in thread From: Jan Stary @ 2020-07-13 11:49 UTC (permalink / raw) To: sox-users On Jul 10 20:40:09, maxd@coregears.com wrote: > 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 I don't use pulseaudio, but I assume that "default" and "null" are names of pulseaudio (pseudo)devices. How can you tell the delay when writing to a null device? (If that means what I think it means: dropping the pulseaudio, would it be what sox -d -n does?) I just tried sox -d -d pitch 1000 an OpenBSD current/amd64, and there is indeed about a half second of delay. > Whenever we add the null loopback or aloop, we experience a delay. I don't understand: what does your application do that you need to "add a null loopback"? On Jul 11 14:12:13, mans@mansr.com wrote: > Some effects have additional internal buffers. It seems there is a delay even when just playing default input to default output; even without the effects: sox -d -d (So I don't think it's the effect processing that introduces the delay.) Jan _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-13 11:49 ` Jan Stary @ 2020-07-13 12:05 ` Jan Stary 2020-07-13 15:09 ` Maxim Doumkine 2020-07-13 20:52 ` Måns Rullgård 2 siblings, 0 replies; 11+ messages in thread From: Jan Stary @ 2020-07-13 12:05 UTC (permalink / raw) To: sox-users On Jul 13 13:49:27, hans@stare.cz wrote: > I just tried > > sox -d -d pitch 1000 > > on OpenBSD current/amd64, and there is indeed > about a half second of delay. For comparison, aucat -c 0:0 -o - | aucat -c 0:0 -i - has about the same delay. _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-13 11:49 ` Jan Stary 2020-07-13 12:05 ` Jan Stary @ 2020-07-13 15:09 ` Maxim Doumkine 2020-07-13 20:52 ` Måns Rullgård 2 siblings, 0 replies; 11+ messages in thread From: Maxim Doumkine @ 2020-07-13 15:09 UTC (permalink / raw) To: sox-users [-- Attachment #1.1: Type: text/plain, Size: 1782 bytes --] It’s definitely not the effect processing… we are using this to modify voice in realtime, make someone sound deeper/older for instance. Without any effects there’s still a delay. On Jul 13, 2020, 4:16 PM +0400, Jan Stary <hans@stare.cz>, wrote: > On Jul 10 20:40:09, maxd@coregears.com wrote: > > 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 > > I don't use pulseaudio, but I assume that "default" > and "null" are names of pulseaudio (pseudo)devices. > > How can you tell the delay when writing to a null device? > (If that means what I think it means: dropping the pulseaudio, > would it be what sox -d -n does?) I just tried > > sox -d -d pitch 1000 > > an OpenBSD current/amd64, and there is indeed > about a half second of delay. > > > Whenever we add the null loopback or aloop, we experience a delay. > > I don't understand: what does your application do > that you need to "add a null loopback"? > > > On Jul 11 14:12:13, mans@mansr.com wrote: > > Some effects have additional internal buffers. > > It seems there is a delay even when just playing > default input to default output; even without the effects: > > sox -d -d > > (So I don't think it's the effect processing > that introduces the delay.) > > Jan > > > > _______________________________________________ > Sox-users mailing list > Sox-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sox-users [-- Attachment #1.2: Type: text/html, Size: 2586 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] [-- Attachment #3: Type: text/plain, Size: 158 bytes --] _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-13 11:49 ` Jan Stary 2020-07-13 12:05 ` Jan Stary 2020-07-13 15:09 ` Maxim Doumkine @ 2020-07-13 20:52 ` Måns Rullgård 2020-07-13 22:20 ` Rafal Maszkowski 2 siblings, 1 reply; 11+ messages in thread From: Måns Rullgård @ 2020-07-13 20:52 UTC (permalink / raw) To: Jan Stary; +Cc: sox-users Jan Stary <hans@stare.cz> writes: > On Jul 11 14:12:13, mans@mansr.com wrote: >> Some effects have additional internal buffers. > > It seems there is a delay even when just playing > default input to default output; even without the effects: > > sox -d -d > > (So I don't think it's the effect processing that introduces the > delay.) No, then it's just the main buffer that is set with the --buffer option. -- Måns Rullgård _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Loopback latency issue 2020-07-13 20:52 ` Måns Rullgård @ 2020-07-13 22:20 ` Rafal Maszkowski 0 siblings, 0 replies; 11+ messages in thread From: Rafal Maszkowski @ 2020-07-13 22:20 UTC (permalink / raw) To: sox-users On Mon, Jul 13, 2020 at 09:52:00PM +0100, Måns Rullgård wrote: > Jan Stary <hans@stare.cz> writes: > > On Jul 11 14:12:13, mans@mansr.com wrote: > >> Some effects have additional internal buffers. > > It seems there is a delay even when just playing > > default input to default output; even without the effects: > > sox -d -d > > (So I don't think it's the effect processing that introduces the > > delay.) > No, then it's just the main buffer that is set with the --buffer option. There are some buffers in the kernel and large default buffers in pulseaudio. I have used only small part of the advice in https://wiki.archlinux.org/index.php/PulseAudio/Troubleshooting and that decreased the delay from some 1/2 s to few tens of ms if I can judge by ear. There is more to read there though. Modify PulseAudio's configuration file (2/4) /etc/pulse/daemon.conf default-fragments = 3 default-fragment-size-msec = 5 Restart the PulseAudio daemon (3/4) R. -- „Walczy on z całym zapamiętaniem przeciwko intelektowi” - z akt personalnych prof. A. Baeumlera _______________________________________________ Sox-users mailing list Sox-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-users ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2020-07-13 22:46 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <0713c9d8-7bdf-4b97-99b4-12e219e94d45@Spark>
2020-07-10 17:40 ` Loopback latency issue Maxim Doumkine
2020-07-10 18:08 ` Darryl Lewis
2020-07-11 16:04 ` Maxim Doumkine
2020-07-11 13:12 ` Måns Rullgård
2020-07-11 15:59 ` Maxim Doumkine
2020-07-11 16:12 ` Steve Masters
2020-07-13 11:49 ` Jan Stary
2020-07-13 12:05 ` Jan Stary
2020-07-13 15:09 ` Maxim Doumkine
2020-07-13 20:52 ` Måns Rullgård
2020-07-13 22:20 ` Rafal Maszkowski
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