[PD] recording 192khz

[Miller Puckette]

Oops, sorry I didn't read to the end of your first message :)

The remaining difference I can think of between Pd and jack is block
size between the app and the audio driver.  I can't imagine that matters,
but I've been surprised before.  Have you tried just increasing the blocksize 
in the suaio dialog?

M


On Sat, Aug 15, 2020 at 12:20:33AM +0200, iftah gabbai wrote:
> thanks miller! im actually writing the files to a usb stick which is def
> fast enough for 2x192khz, 24bit, not to the SDHC, so im buffeld. it works
> fine if i use jack_capture but somehow not with PD. if this is relevant im
> on a fresh install of the latest raspbian OS lite
> 
> cheers
> 
> On Sat, Aug 15, 2020 at 12:00 AM Miller Puckette <msp at ucsd.edu> wrote:
> 
> > This is almost certainly being limited by write speed to the storage
> > medium.  If the file lives on an SDHC card, you can probably improve
> > things by getting one that has a higher write speed.  (The specifications
> > are very confusing so it might take a while to figure out what kind is how
> > fast).
> >
> > Alternatively, you could attach an ordinary USB disk drive to write
> > soundfiles
> > to.  Just a regular spinny-disk one; the solid state ones aren't any faster
> > because either type is limited by USB bus speed.
> >
> > cheers
> > Miller
> >
> > On Fri, Aug 14, 2020 at 10:22:26PM +0200, iftah gabbai wrote:
> > > hi there, im attempting to record a stereo file (192khz, 24bit) using
> > > writesf~ on a rpi3b running headless using the inputs of my usb class
> > > compliant soundcard (presonus 24c), so far with no luck,  i get crackles
> > > after around 10sec of recordings. the weird thing is that the pd process
> > > uses  around 16% of one core - so theoretically it should be fine,
> > right? i
> > > even tried to up the -audiobuf to 100ms but this does not help either. i
> > > write the recordings to an external usb stick that can handle much higher
> > > speeds than teh equivalent of 1s/192/24 so i dont think its this either,
> > > while i dont run a realtime kernel i have my scaling_governor set to
> > > performance. i wonder if anyone have any leads? or is this only possible
> > > with rt kernel?
> > >
> > > best
> >
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