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[RC23]

JRiver delivers the opportunity for lipsync if convolution and active network produces a time delay of audio to video. I will build a 5.2 setup with 4-way speakers as satellites. Acourate delivers the FIR filters for convolution and active network.

What is the maximum of time delay which JR is able to handle?

I suppose that every additional channel increases the CPU load and not the time delay. Is this right?

Ruediger
 

[Matt]

There's no hard limit.

DVD playback won't work with more than a few hundred milliseconds of latency.  Audio and most other video formats work with any amount of latency.

[RC23]

The latency comes by Acourate a software for room correction and digital frequency crossovers. http://www.audiovero.de/en/

Here an estimation downward for online convolution: With 65536 taps for example you get a latency of 743ms. Acourate works easy with higher number of taps such as 262144 which produce a latency of 2972ms. And this value is to high for JRiver which is only applicable for maximum 2500ms.



The latency [ms] will be calculated by dividing half of filter length by sample rate.

The value 2500 I have found in a posting of Bob Katz who had initially a problem with to high latency. http://yabb.jriver.com/interact/index.php?topic=76969.msg553500#msg553500

More latency comes by ASIO buffer size up a maximum of 2048 samples. I will use an 8-channel Focusrite Saffire 40 Firewire interface for a 4-way active loudspeaker.

It would be fine if you increase the maximum latency from 2500s to 5000ms. This value delivers a future-proof solution for further steps with Acourate.

Ruediger