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mvMapBetweenTracks(3dm)				       mvMapBetweenTracks(3dm)

NAME    [Toc]    [Back]

     mvMapBetweenTracks	- convert frame	numbers	between	tracks

SYNOPSIS    [Toc]    [Back]

     #include <dmedia/moviefile.h>

     DMstatus mvMapBetweenTracks( MVid fromTrack, MVid toTrack,
			      MVframe fromFrameIndex, MVframe* toFrameIndex )

DESCRIPTION    [Toc]    [Back]

     Different tracks in a movie have different	rates of presentation.	Frame
     number 10 of an image track may be	presented at the same time as frame
     number 220500 in an audio track.  This function is	used to	find
     corresponding frame numbers in different tracks.

     The tracks	are named by fromTrack and toTrack.  The frame number of track
     fromTrack in fromFrameIndex is converted to a frame number	for track
     toTrack and placed	in toFrameIndex.

     The starting times	for frames in different	tracks may not coincide
     exactly if	the rate of one	is not an exact	multiple of the	other.	The
     frame in toTrack that starts at or	before and ends	after the starting
     time of fromFrameIndex in fromTrack is the	one that is returned.

     mvMapBetweenTracks	returns	DM_SUCCESS if there is a corresponding frame
     and DM_FAILURE if there is	not.

SEE ALSO    [Toc]    [Back]

     mvIntro(3dm), mvAddTrack(3dm), mvFindTrack(3dm), mvGetErrno(3dm).

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