[PD] recording 192khz

iftah gabbai ift.gab at gmail.com
Sat Aug 15 00:20:33 CEST 2020

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


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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