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AVIStreamNextKeyFrame
The AVIStreamNextKeyFrame macro locates the next key frame following a specified position in a stream.
AVIStreamNextKeyFrame(
Parameters
pavi
Handle of an open stream.
lPos
Starting position to search in the stream.
Return Values
Returns the position of the key frame if successful or  1 otherwise.
Remarks
The search performed by this macro does not include the frame at the specified
position.
The AVIStreamNextKeyFrame macro is defined as follows:
#define AVIStreamNextKeyFrame(pavi, lPos) \
AVIStreamFindSample(pavi, lPos + 1, FIND_NEXT | FIND_KEY)
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