I have a movie-reader baded on the QTPixelBufferVCTToCGImage sample. It works except that it is NOT TIMING-SAFE ---- if buffer processing is delayed, buffers will be overwritten by later images even though they are retained and the address locked! You can get by with that for simple movie players, but it is unacceptable for more complex applications. This is a generic problem for all Quicktime movie-reading applications using this approach.
The problem occurs because the PixelBufferPool used during decompression apparently has an "aging" mechanism controlled by kCVPixelBufferPoolMaximumBufferAgeKey It "ages" the pixel buffer by moving it back into the available-buffer queue even though it is locked. This is a bug.
I am looking for help to work around this by disabling the aging mechanism----but I can not see how to get to the pixel buffer pool in order to set the kCVPixelBufferPoolMaximumBufferAgeKey value. (The type of the number to be set is not obvious either even though the value is zero.)
Thanks,
Russ
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