i think i tried it (if i understand correctly), i started jack with rt prio and added the -jack tag to pd and it didnt work, just for test sake i tried a simple python script using pyaudio and recorded 10 min of 2 ch 192khz 24bit with no prob so im narrowing this down to pd misbehaving  somehow? 

On Sat 15. Aug 2020 at 21:41, Simon Iten <itensimon@gmail.com> wrote:
does it work if you use jack as audioserver and connect pd to it?

On Sat, Aug 15, 2020, 00:22 iftah gabbai <ift.gab@gmail.com> 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@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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