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 <m...@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 <m...@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 > > > > > > > > > _______________________________________________ > > > > > Pd-list@lists.iem.at mailing list > > > > > UNSUBSCRIBE and account-management -> > > > > > > https://urldefense.com/v3/__https://lists.puredata.info/listinfo/pd-list__;!!Mih3wA!WY75P-RP7fEB5wWfbvMf9YeFbe3QPmpLN3Ueg1O6sGalKcabQ7HOv3U76Eqw$ > > > > > > > > > > > > > _______________________________________________ > > > Pd-list@lists.iem.at mailing list > > > UNSUBSCRIBE and account-management -> > > https://urldefense.com/v3/__https://lists.puredata.info/listinfo/pd-list__;!!Mih3wA!RGpNNxBX_Pu7bkn8ly_1PQ9HD2uRrZfYWvRKXfr11LRmHozXMVZoJ4FpyL3f$ > > > > > _______________________________________________ > Pd-list@lists.iem.at mailing list > UNSUBSCRIBE and account-management -> > https://urldefense.com/v3/__https://lists.puredata.info/listinfo/pd-list__;!!Mih3wA!W6L8x8W37605JTT2NJ1pUlOH5tYj65d9g1V9Oo53O-jz_3bjUO4-U_bljHoK$ > _______________________________________________ Pd-list@lists.iem.at mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list