kScenesRecordFrame when a single frame is exported to the movie file The payload is the frame count and a blend factor, that indicates whether this frame is a sub frame and the ratio that this frame contributes to the whole frame.
Used for blending multiple frames together for scene transition. If this frame is not a sub frame, the ration is -1.0. To blend all subframes, kScenesRecordFrame will be called a final time with the ratio set to -1. For example for a sub frame : kScenesRecordFrame {frameCount, 0.4} kScenesRecordFrame {frameCount, 0.6} kScenesRecordFrame {frameCount, -1.0} or for a non sub frame: kScenesRecordFrame {frameCount, -1.0}