[PD] recording 192khz

[Miller Puckette]

wierd... maybe it's some form of bus starvation (e.g., USB contention
between USB stick and audio intf) - if this is so you might be able to
record to the SDHC instead, if there's enough space on it.  But I still don't
get why this would happen for Pd and not for jack...

M

On Sat, Aug 15, 2020 at 12:41:27AM +0200, iftah gabbai wrote:
> happens to me all the time :)
> 
> im running pd headless from the command line, at first i used just the
> -audiobuf tag and later i tried specifying the -blocksize (for example 1024
> and higher, went up to 4096 cause i dont care about latency) but for some
> reason it seemed even to make this even worse (i was monitoring the signal
> with adc -> dac)
> 
> 
> 
> 
> 
> 
> On Sat, Aug 15, 2020 at 12:37 AM Miller Puckette <msp at ucsd.edu> wrote:
> 
> > 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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