Re: [LAU] (Ardour) How to get rid of delay when recording ?

On Sun, Feb 14, 2016 at 11:05:43AM -0500, jonetsu@email-addr-hidden wrote:
 
> /usr/bin/jackd -T -ndefault -dalsa -dhw:M1010LT -r44100 -p512 -n2
> configuring for 44100Hz, period = 512 frames (11.6 ms), buffer = 2
> periods
>
> 1597.528 frames 36.225 ms total roundtrip latency
> extra loopback latency: 61 frames
> use 30 for the backend arguments -I and -O
>
> /usr/bin/jackd -T -ndefault -dalsa -dhw:M1010LT -r44100 -p256 -n2
> configuring for 44100Hz, period = 256 frames (5.8 ms), buffer = 2
> periods
>
> 829.529 frames 18.810 ms total roundtrip latency
>
> ...

These numbers lead to the conclusion that the total latency is
3 * period_time + 1.4 ms.

Since you use -n 2, the 3 * probably means that you are using
jack2 (aka jackdmp) without the sync option. If you use that
option (or jack1) the latency will be one period time less.

Ciao,

-- 
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
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