[PD] recording 192khz

Miller Puckette msp at ucsd.edu
Sat Aug 15 00:00:41 CEST 2020

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

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.


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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