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

[Jörg Müller]

Thanks for the information.

The two MADI FX cards I'm using can be synced via word clock.

However, the information needs to be unaltered, no resampling or any
modification is allowed for our processing. What command line settings do I
have to use to make sure of that? How can I use the official zita-ajbridge
or is there some documentation about it?

2017-01-24 16:36 GMT+01:00 Thomas Brand <tom at trellis.ch>:

> On Tue, January 24, 2017 16:27, Thomas Brand wrote:
> > 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.
> >
> > Greetings
> > Thomas
> >
> Even if the interfaces are synchronized with S/PDIF, there will be some
> cycles (hopefully a static number) needed to shove data forth and back.
> This needs to be considered to effectively get synchronous behaviour for
> input or output to both interfaces.
>
>
>
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