I think this is the cause of content being overlapped in this case.
-It is tempting to solve this by making Time a subdivsion of DCP video
+It is tempting to solve this by making Time a subdivision of DCP video
frame rate. This makes things nicer in many ways; you get a 1:1
mapping of content video frames to Time in most cases, but not when
video frames are skipped to halve the frame rate, say. In this case