Re: Creating a movie from scratch with QTKit

Subject: Re: Creating a movie from scratch with QTKit

From: Tim Monroe <email@hidden>

Date: Thu, 1 Jun 2006 13:31:18 -0700

Delivered-to: email@hidden

On Jun 1, 2006, at 12:04 PM, Derrick Bass wrote:

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.

Yep, that's weird. GetMovieStickyError is not likely to be terribly useful when used in conjunction with QTKit method calls.

What am I doing wrong?

updateMovieFile looks at certain instance variables of the QTMovie to determine whether it can successfully update the movie file, and those ivars are not being set appropriately by your code. I think you need to follow the pattern of QTKitCreateMovie until QTKit provides a method call that will do exactly what you want. Sorry. Is there some technical reason you cannot follow that pattern?

Tim Monroe

QuickTime Engineering

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