[PD] Re : Split multichannel audio file into stereo pairs

Roman Haefeli reduzierer at yahoo.de
Tue Jun 16 22:58:50 CEST 2009

On Tue, 2009-06-16 at 09:03 +0000, dwanafite wrote:
> Hi
> You could use [readsf~ 12] to read your file and then several [writesf~ 2] to record, but i guess you want something faster... However, I don't know how readsf~ behaves with 12 tracks/32-bits files (that's somewhat extreme).

this is not a bad idea, i'd say. you can put both, the [readsf~ 12]  and
the six [writesf~], into an upsampled subpatch to make it faster (using
a [block~] object). 
even if your harddrive wouldn't be able to read or write that fast, you
won't have any dropouts in the resulting files, since pd works in a
deterministic manner.

since version 0.42, there is a -batch flag, that allows you to run pd as
a sound 'renderer at maximum speed, similar to the 'bounce-to-file'
option in some DAWs. then you don't even need any [block~] trickery



> _______________________
> De : Ignacio Viano <ignacioviano at gmail.com>
> À : pd-list at iem.at
> Envoyé le : Mardi, 16 Juin 2009, 4h01mn 58s
> Objet : [PD] Split multichannel audio file into stereo pairs
> Hi everyone.
> I want to split a 32-bits 12 tracks audio file (aif) into 6 stereo files (consecutive pairs i.e. 1-2, 3-4, etc.).
> I've already tried with [soundfiler], but there seems to be many problems with large files (this one is aprox. 10 minutes lenght) and with 32-bits reading (I listen a kind of quantizing error noise, a sort of dithering-less noise). In fact, I'm thinking of reporting a bug on it, but I'd have to explain which exactly the problem is, and I need some time for that.
> Currently, I'm doing this manually with Audacity, but I need it to be automatic and, if possibly, with PD. Any ideas?
> Thanks
> Ignacio
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