Re: [LAD] JACK Graph Internal Latency? (was Re: A small article ...)

From: Louigi Verona <louigi.verona@email-addr-hidden>
Date: Thu Apr 29 2010 - 12:27:21 EEST

My version is 0.44, I think. pretty late one, I compiled ot from git in
February or January.
I can try another version or another app for that matter. But let Paul tell
us if it makes sense at all.

On Thu, Apr 29, 2010 at 1:25 PM, Ralf Mardorf <ralf.mardorf@email-addr-hidden-dsl.net>wrote:

> Louigi Verona wrote:
>
>> Hey guys!
>>
>> I was the one who tested this for Mike. I used Qtractor and Rakarrack.
>> In Qtractor I had Audio track 1 and Audio track 2.
>> Signal from track 1 was routed into Rakarrack and then into track 2.
>>
>> The latency is there and quite audible.
>>
>> Louigi.
>>
>
> Maybe it has nothing to do with this:
>
> -------- Original Message --------
> Subject: Re: [LAD] JACK Graph Internal Latency? (was Re: A small
> article ...)
> Date: Thu, 29 Apr 2010 11:17:31 +0200
> From: Ralf Mardorf <ralf.mardorf@email-addr-hidden-dsl.net>
> To: michael noble <looplog@email-addr-hidden>
> CC: linux-audio-dev@email-addr-hidden
> References: <
> s2q339c30111004281945ke03e953dp404e0b63e42b563d@email-addr-hidden>
> <m2yeb4b5e1d1004282041j67fd5bcek60636d345c38ba0f@email-addr-hidden>
> <l2y339c30111004282258rfd24b69bo3f86bbd54235ff12@email-addr-hidden>
> <p2p339c30111004290202u6fec7788ka4b038632ac42c87@email-addr-hidden>
>
> [snip]
>
>
>
> I also wonder why JACK's zero-copy implementation could cause issues
> for
> audio apps. There was an issue for Qtractor, anyway, until today I
> believed that there is no latency when using JACK in any way, excluded
> connections regarding to the sound card.
> I never noticed a latency, but maybe it's because I used this insert
> connections for time related FX only, e.g. flanger and delay.
>
> Interesting to read about latency I never was able to hear.
>
> Ralf
>
> But anyway, what version of Qtractor do you use? There was an issue related
> to a supposed zero-copy implementation for outdated versions of Qtractor,
> that a long time ago was fixed in SVN or even in the previously used CVS.
>
> Ralf
>

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Received on Thu Apr 29 20:15:02 2010

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