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From: Maxim Doumkine <maxd@coregears.com>
To: sox-users@lists.sourceforge.net
Subject: Re: Loopback latency issue
Date: Mon, 13 Jul 2020 19:09:56 +0400
Message-ID: <5dc590c7-74bc-44ac-af72-6cada8b19bfc@Spark> (raw)
In-Reply-To: <20200713114927.GA79444@www.stare.cz>


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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
>
>
>
> _______________________________________________
> Sox-users mailing list
> Sox-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/sox-users

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Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <0713c9d8-7bdf-4b97-99b4-12e219e94d45@Spark>
2020-07-10 17:40 ` 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 [this message]
2020-07-13 20:52     ` Måns Rullgård
2020-07-13 22:20       ` Rafal Maszkowski

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