Stretching AC3

[mapomme1108]

Hello
I've got a movie with 23.976 frame per second with AC3 5.1.
I want to change the framerate to 25 FPS but if I do so the sound and video will not be synchro.
So I need a way either to strech the AC3 file (I don't know how to do it) or to demux it in 6 wav files (I don't know how to do it) so I can strech them (I know how to do it) and put them back together in a AC3 5.1 file (I don't know how to do it).
Thanks to all who will answer

[setarip]

Try http://thunder.eeap.cwru.edu/~zhuo/mp2ac3scale.zip

Read about it at: http://thunder.eeap.cwru.edu/~zhuo/audioscale.html