[Jack-Devel] Cannot combine audio devices with more than 64 channels

Thomas Brand tom at trellis.ch
Tue Jan 24 16:27:00 CET 2017

On Tue, January 24, 2017 09:22, Ralf Mardorf wrote:
> On Tue, 24 Jan 2017 07:41:50 +0000, j at jrigg.co.uk wrote:
>> On Mon, Jan 23, 2017 at 05:35:57PM +0000, Fons Adriaensen wrote:
>>> With the official zita-ajbridge you can disable resampling.
>> Good to know.
> Could this be used without word clock, by using a digital interface to
> sync, e.g. S/PDIF? If so, assuming two identical cards would be used, would
> sync be hat good, that each combination of IOs, e.g. a channel from one
> card for the left and of the other card for the right channel of a stereo
> signal, wouldn't cause phasing issues?
yes i think that works pretty good (drawing from earlier experiments).
Using S/PDIF just for sync is a cheap alternative to a "real" wordclock.
One of both interfaces will be slaved to the other and then both should
run the same cycle at the same time (so theoretically no phasing issues).
You just have to manage to shove forth and back the sample data from/to
interface at good enough rate which isn't a particular problem on
localhost using UDP like zita does. If there is no resampling involved,
this can work for many many channels without hitting the CPU too much.


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