Sound : How to do time stretching

[thenaoh2]

Hello,

I'm looking for an algorithm allowing me to change the speed of a mp3 file without affecting its pitch (time stretching).

I already looked at some librairires like SoundTouch, but I don't manage to understand how it's done.

The purpose of that is to mix 2 songs like a DJ, so I not only need to have my songs at the same tempo (what I manage to do with SoundTouch), but also to launch my second song at the exact time I want (what I don't manage to do with SoundTouch ...).

Thanks for your help !

[moccamaximum]

Not too familiar with SoundTouch but you should be able to get the position of a sound before/after applying your effects

as shown here:

https://github.com/also/soundtouch-as3/blob/master/examples/player/SimplePlayer.as

[thenaoh2]

Thanks, but I've already seen that, and unfortunately, after reading the source code of SoundTouch, it's much more complicated than that ...

By the way, a good time stretching algorithm would be very appreciated 🙂

[ocbfd]

You should do that outside of flash.  Do all sound editing outside of flash and just play the sounds in flash.