Re: [Jack-Devel] Very frustrating problem with JACK and exporting through mixbus

On Mon, May 07, 2012 at 11:40:13AM -0600, Jason Jones wrote:
> I then loaded up a finalized session in mixbus with 20 tracks and 10 busses
> (in addition to the 8 default mixbus's), as well as 10-20 plugins running,
> and tried to export - and it failed with the same aforementioned problem.
>  Just hangs, with the "JackFreewheelDriver::Process: Process error" error.
>  In order to exit mixbus, I have to kill through a terminal, too.
> 
> So... Not sure if that sheds light on anything, but for small simple
> sessions, the Jack2 / Raydat combo doesn't seem to have a problem
> exporting.  The only problem I've noticed so far is with big sessions on
> mixbus.

What export parameters are you using (eg. sample rate conversion if any)?

Possibly unconnected, but I've had an ongoing export problem in ardour-2.8.x
for a while now. A simple export with no SRC always works. If I export from
a 48kHz session to 44.1kHz 16-bit with triangular dither it fails about 70%
of the time. Using jack1, when it fails the export window disappears
immediately and the destination file is created but is empty. It
consistently takes 3 or 4 attempts to export.

I haven't tested it with jack2, but I'm guessing there might be a race
condition which is triggered by trying to do more than a simple export.
Changing the interface hasn't made any difference here. It's the same
with a Delta 1010 or RME HDSPe MADI card.

John

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