Realtime group scheduling doesn't know JACK [LWN.net]

Realtime group scheduling doesn't know JACK

Posted Dec 23, 2010 15:38 UTC (Thu) by tseaver (subscriber, #1544)
In reply to: Realtime group scheduling doesn't know JACK by jimparis
Parent article: Realtime group scheduling doesn't know JACK

> Why is the latency between audio input -> audio output be any more
> difficult than the latency between USB input -> video output?

When doing multitrack recording, the performer is listening to the audio
output while singing / playing / speaking in time with it. Any human-
perceptible latency in the loop interferes with her ability to perform
well: lags are *incredibly* painful in this situation.

JACK-with-RT makes it possible to drive the latency down to a few
milliseconds (two on my laptop, using a decent USB audio interface),
making it again pleasant (even possible) to do multi-track work.

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