[PD] Glitch

[Christof Ressi]

this sounds very much like a buffering problem. Try to increase Pd's latency in the audio settings and see if the problem persists. When I'm working with Raspberry Pi + cheap USB soundcards I sometimes have to increase the latency up to 100 ms to get rid of occasional glitches when the CPU load is high.

> Gesendet: Mittwoch, 04. Juli 2018 um 12:44 Uhr
> Von: "michael strohmann" <itsnotfair9 at gmail.com>
> An: pd-list at lists.iem.at
> Betreff: Re: [PD] Glitch
>
> the file i play back is a clean voice recording.
> ups,  i am actually using readsf~ 
> will try to record pd internally...
> 
> anybody has experienced that behaviour with ESI 6 Channel Interface?
> Cheers!
> mkl
> 
> > 
> > On Wed, 2018-07-04 at 10:53 +0200, michael strohmann wrote:
> >> 
> >> Hello!
> >> from time to time my patch produces this beautiful, but unwanted
> >> glitch. (audiofile attached)
> > 
> > Sounds like I'm doing doing music. I wouldn't know how to identify the
> > glitch aspect of it. How does it sound without the glitch?
> > 
> > Some suggestions to make such things a bit easier:
> > * Do not use compressed files to illustrate a glitch. It's hard to
> >   know what to attribute to the compression and what to the glitch.
> > * If possible, provide also an example of how it is supposed to sound.
> > * If possible, rather post links to your media files instead of
> >   attaching them to your mail. There is no point in every list member
> >   have their mail account filled with media files.
> > 
> >> are there any ideas what could cause this behaviour?
> > 
> > I would first figure out where the glitch happens. Is Pd actually
> > generating this sound or is Pd's audio playback glitchy? You can figure
> > this out by doing a recording from within Pd with [writesf~]. If the
> > result sounds OK, then you know that the glitch happens somewhere
> > between Pd and the sound card. If the result is glitchy, then the
> > glitch happens already within Pd, for instance because some object or
> > your patch is buggy. 
> > 
> >> i am running this on a RPi B+, using sfplay~ to playback a 4 Channel
> >> Audiofile.
> > 
> > Why are you using [sfplay~] and not the built-in [readsf~]? Does the
> > glitch still appear when using [readsf~]?
> > 
> >> the playback is triggered via a sensor/GPIO or via OSC.
> > 
> > This hopefully doesn't matter.
> > 
> >> restarting the RPi eliminates the glitch.
> > 
> > Could be some sound card issue, but check the other things first.
> > 
> > Roman
> 
> 
> _______________________________________________
> Pd-list at lists.iem.at mailing list
> UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
>