Re: [ecasound] Automated volume change

On Fri, 2 Sep 2005, Luis Pablo Gasparotto wrote:

> I would like to know if there's some way to change, as an example, the volume
> (-ea) parameter in a certain time position.
>
> Example:
> ecasound -i:test.wav -ea:100
> and I would like -ea:120 at the 5 seconds position.

Yes, see ecasound(1) and the -klg operator, the general linear envelope.
To implement your example:

ecasound -i:test.wav -ea:100 -klg:1,100,120,3,0,0,4,0,5,1

IOW, you define three change points (0,0), (4,0) and (5,1),
where (x,y) => x=position-secs, y=value-between-0.0...1.0.

With simple cases you can also use the more straightforward
linear envelopes. For example you can achieve the above with:

ecasound -i:test.wav -ea:100 -kl2:1,100,120,4,1

This creates the same effect, -ea stays at 100% until pos=4sec, where it
starts to increasing, and at pos=4+1sec, -ea should be 120%, where it
stays until end of processing.

> May I do it using -km?

That'd also work, but then you need to setup an external MIDI controller.

--
  links, my public keys, etc at http://eca.cx/kv
-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO
September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
Ecasound-list mailing list
Ecasound-list@email-addr-hidden
https://lists.sourceforge.net/lists/listinfo/ecasound-list