Re: synchronise the start of [writesf~] to (network) clock time?

IOhannes m zmoelnig via Pd-list <[email protected]> Thu, 16 Oct 2025 10:06:24 +0200

Newsgroups	gmane.comp.multimedia.puredata.general
Message-ID	<[email protected]>

On 10/16/25 08:54, Peter P. wrote:
> As a workaround I could somehow encode the start time of [writesf~] into its
> first sample and use some python script to synchronise these recordings
> later, comparable to broadcast wave timestamps, which I thing have
> hms:frame timing resolution.
> 
> Is there a more elegant way of achieving this?

if you want to have sample-accurate resolution, this is a non-trivial task.

zexy's [time] will give you the current system time, but Pd uses an 
audio buffer, so the actual system time might will typically not 
correspond (nor have a constant offset) to an imaginary timestamp 
attached to a "sample" as it leaves your soundcard.

we did something like synchronous recording on multiple devices in the 
wilma project a couple of years ago (<https://wilma.kug.ac.at>).

iirc, it involved special hardware that was synched via radio (not NTP 
over WiFi) and encoded the wall clock timestamps within a dedicated 
audio channel.

gfmasdr
IOhannes

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