Re: Loopback latency issue

[Maxim Doumkine <maxd@coregears.com>]

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	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
>
>
>
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