> Can someone tell me, in high-level terms, how I would do this? A QCRenderer
> seems obviously necessary. I saw a sample app that exports TIFF files for
> each frame, perhaps I can start with that and create an H.264 movie (would I
> use CoreVideo for that?). I suppose the best thing is to synchronously
> process the input movie, controlling the time base, but I'm not sure how to
> do that; the end result I want is to process each frame of the input movie
> separately.
* Open the movie using QuickTime/QTKit
* Open output movie for editing (using QuickTime/QTKit)
* foreach(frame in movie)
* extract output frame
* drive QC renderer using movie output frame as input
* get output (-snapshotImageOfType:)
* add to output movie
* Then do some tricks to get the audio tracks form the source movie to
the destination (you should ask on the QuickTime list for the details of that
sort of stuff).
* If you want to be polite, you could also add other non-video tracks
(subtitles, chapters, etc).
* If you get too far along in this, you'll soon find that a movie can
actually have several independent video tracks -- this can complicate things
(usually only 1 is enabled, which makes your life much easier, but that's not
always the case).
You can extract arbitrary frames from a QTMovie regardless of time, and you can
drive the composition's clock off of the frame's reported display time (so that
the composition "plays" at the same rate as the movie) -- this makes it
possible to work off-line (where you don't have to decode -> render -> encode
in realtime, which is difficult for higher quality codecs)
CoreVideo isn't likely to help you much here -- movie input/output is pretty
much exclusively done through QuickTime/QTKit.
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