This is a bit of strange situation due to a DVD mastering fault.
I have a TV series where the DVD is PAL but I think the audio has been pitch corrected except for one episode. This one episode everyone sounds like chipmunks. I think it’s actually sped up not by usual PAL speed up of 4%, but 8%!
I know this by performing a quick test in VLC by playing back first at 0.96 speed but it still sounded high. 0.94 would be about right.
Anyway, I don’t want to simply convert from 25fps to 23.976, I want keep the video as it is but pitch shift the audio down by 8%. How would I achieve this without re-compressing the AC3?