Pitch Shifting with Quicktime for video playback

Hi all-

Has anyone experimented with the kQTAudioPropertyID_RateChangesPreservePitch Quicktime Movie property?

I am writing an app that uses variable video speeds and would like to pitch shift the audio back to normal. I realize the other audio frameworks can do this easily, but I’d rather not have to sync the audio and video.

I’ve played with oFQuickTimePlayer.cpp quite a bit to no avail. Supposedly QT has a built in flag (above) that resamples the audio at a relative rate to the video speed. Any help would be great!