The specs claim that both QTMovieLayer and QCCompositionLayer start
automatically.  They don't.  I have to explicitly start Movies and I haven't
figured out yet how to start a QCCompositionLayer.  I get the initial image
in a QCCompositionLayer, but no play.  How do you start it?

    A related question (also posted in the QC Forum) is how can you tell
when a composition finishes (if it does)?


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