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Creating a movie from scratch with QTKit

I'm trying to create an on-disk movie from scratch with QTKit. QTKitCreateMovie has some sample code for how to do this, but it actually creates a temporary file and then later flattens the movie to a new file. I just want to specify the destination file at the outset, but when I try to update the movie atom, I get an error. I'm doing something like this:
QTNewDataReferenceFromFullPathCFString
CreateMovieStorage
m = [QTMovie movieWithQuickTimeMovie:disposeWhenDone:error:]
[m setAttribute:[NSNumber numberWithBool:YES] forKey:QTMovieEditableAttribute];
[m updateMovieFile];

That last call returns NO. GetMoviesStickyError() says -2026 (userDataItemNotFound) which seems really weird.

What am I doing wrong?

Derrick

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