Re: [Audacity-nyquist] Normalizing long tracks

[Steve t. F. <ste...@gm...>]

Thanks Roger, but that's what I've been trying unsuccessfully to do.

I found this in the manual:

"; if you don't have space in memory, here's how to do it:
(defun myscore () (sim (osc c4) (osc c5)))
; compute the maximum:
(setf mymax (peak (myscore) NY:ALL))"

Applying this to a track in Audacity, I'm assuming it's something like:

(setf mymax (peak s NY:ALL))

but doing that eats all of my RAM and it grinds to a halt. (I have less 
than 4GB of RAM and so with very large tracks RAM starts swapping to disk)


The problem that I can't get round is in computing the peak without the 
entire selection loading into RAM all in one go.
I've tried all sorts of things, such as using a loop with (extract start 
stop beh) or using (snd-avg ...), but I keep hitting the same problem of 
"s" loading into RAM.

I am able to write a normalized file to disk using (play s) without 
running out of RAM, but for the purposes of writing a plug-in that is 
not a practical solution.

Steve D


Roger Dannenberg wrote:
> See the Nyquist documentation. You should be able to compute the peak 
> value in one pass, save the result, then make another pass to normalize.
>
> -Roger
>
>
> Steve the Fiddle wrote:
>> Is there any way to normalize LONG tracks in Audacity (with Nyquist) 
>> without consuming several GB of RAM during processing?
>> I'm using Audacity 1.3.11 and every method that I've tried loads the 
>> entire selection into RAM (and grinds to a halt if there is not 
>> enough RAM available).
>>
>> Steve D