Thanks Giulio,
I added some latency to the MIDI events I send (midi notes), but I kept
MTC without any latency because I'm afraid to compromise the MIDI sync.
Hope this could resolve this.
Is there a way to make Pd warn me when it drops an audio callback?
Nicola
Il 16/06/2017 13:42, Giulio Moro ha scritto:
Pd messages get processed in the audio thread in a sample-accurate fashion. This means
that if you are sending many messages within the time of the audio callback, then your
callback will take longer to execute. If the time it takes to execute exceeds the time
available for it to complete, then you are going to get a dropout in the audio. I then
believe that Pd's internal "logical time" will slow down compared to system
time as a consequence of dropping one (or more) audio callback.
So you get both glitches and slower metro.
Solution is to throttle your messages: do not send them all at once but add a
few ms delay between them.
Giulio
________________________________
From: Nicola Pandini <[email protected]>
To: [email protected]
Sent: Friday, 16 June 2017, 11:47
Subject: [PD] metro slow down + audio drop-outs
Hi list,
I have a patch that acts as MIDI master, that sends MTC and other data
via udpsend to 4 udp ports.
It happens that sometime the patch's audio metronome begin to slow down
for a bunch of seconds. I also hear cracklings in metronome sound (the
metronome patch is based on a simple [metro] object).
I don't see any xrun, so I'm starting to think it's a problem of the
patch. Maybe the buffer of udpsend? Because it seems to happen when I'm
sending more data than usual (not everytime, though).
Can you give me some hints? I'm using pd-extended on Debian Jessie.
Thanks
--
Nicola
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