Indicates whether the QTMovie must be opened asynchronously (NSNumberYES) or not (NSNumberNO).

Set this attribute to an NSNumber wrapping YES to indicate that all operations necessary to open the movie file (or other container) and create a valid QTMovie object must occur asynchronously. That is to say, the methods +movieWithAttributes:error: and -initWithAttributes:error: must return almost immediately, performing any lengthy operations on another thread. Your application can monitor the movie load state to determine the progress of those operations.

If you require asynchronous opening but QTMovie is unable to honor your request, then the methods +movieWithAttributes:error: and -initWithAttributes:error: return nil with an NSError having the error domain QTKitErrorDomain and code QTErrorMovieOpeningCannotBeAsynchronous.

Declared in QTMovie.h.

Mac OS X v10.6 and later; QuickTime 7.6.3 and later.