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MovieExportFromProceduresToDataRef, threads, callbacks order etc

Hi there!

I'm newbie in QT, so my questions may look trivial but anyway... I'm trying to export the movie using MovieExportFromProceduresToDataRef function and got few questions. When I export the movies, QT calls audio and video data callbacks. Does QT calls the callbacks from the same internal thread or from different threads? What is the calls order? Does the calls order depends on number of audio/video frames? Does QT calls audio callback first all the time? Finally is there some FAQ or real documentation about MovieExportFromProcedures function (standart QT documentation doesn't really explain how does it work).

Thanks.

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