[Jack-Devel] I'm confused about latency

Ralf Mardorf ralf.mardorf at alice-dsl.net
Fri Apr 5 11:48:26 CEST 2019

On Fri, 5 Apr 2019 10:36:02 +0200, Alexandre BIQUE wrote:
>2.5 ms is quite a lot

A lot of people don't care about it. A digital guitar stomp box might
allready add additional 5 ms and people often don't notice it.

>I'm skeptical that people want to put a feedback cable into their audio
>interface and measure exactly how much latency is introduced, and then
>configure their tools with some mystic latency compensation. I really
>think that if we can get some values from the OS which minimize the
>error that would be better.

On Linux Ardour suggests to measure the round trip latency and on
iOS Auria Pro suggests to do a measurement, too. The gearslutz.com
forums discussed this and recommend to measure if "you really need to
have sample accurate timing". It's not unusual to connect a cable and
to push a button and perhaps to manually add a value to a dialog, if
it shouldn't be automated. How should the additional device's latency
be reported for e.g. an ADAT device connected to the audio interface,
even if all other latency would be reported?

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