The current number of sprites in the target sprite track is returned. Since the number of sprites is defined by a sprite media key frame sample, this depends on the current movie time.
kOperandSpriteTrackNumImages
No Params
The current number of images for the target sprite track is returned. Since the number of sprite images is defined by a sprite media key frame sample, this depends on the current movie time.
kOperandSpriteTrackVariable
[QTAtomID variableID]
Returns the value of the variable with the specified ID for the target sprite track. If the variable has never been set with a set variable action, the value returned is 0.
