Re: Question about DetachMovieFromCurrent call failures.

I have a question as to why DetachMovieFromCurrent call would fail  

with -2098 from the main thread? I was trying to move  a movie to  

secondary thread for some processing but it appears to not like it.

It would fail if the Movie contains Media that requires the use of a non thread-safe component.

See Thread-safe programming in QuickTime

http://developer.apple.com/technotes/tn/tn2125.html

Are there format limitations to moving a movie onto another thread?  

Yes. Download the Fiendishthngs sample and sort on the Thread-Safe column. Any Media requiring any of the components listed with a NO will produce the error.

None of the sample code i have seen does this either. This is with  

Quicktime 7.2 and OS 10.5. For now i will move all to main thread and  

use performSelectorOnMainThread to schedule processing on the main  

thread.

The strategy of moving  operations to the main thread if the Movie cannot be process on a background thread has been discussed in the above TN and shown in the ThreadsXXX series of samples -- ThreadsExporter, ThreadsExportMovie and so on from back in 2005 I believe. QTKit requires a slightly different approach also discussed in the above TN.

regards,

edward

Edward Agabeg :: QuickTime & Audio

Developer Technical Support Engineer

Apple Inc.

http://www.apple.com/developer

 http://www.apple.com/quicktime

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