Specifies how the Video Stream will playback. When the Playback is set to RealTime, the video will playback in real time. When the Playback is set to TimeInterval, the video will seek to the frame that corresponds linearly to the current Scene Manager time within the interval defined by Interval Start Time and Interval End Time. For instance, if the video contains 60 frames and the Interval Start Time and Interval End Time specify a 60 minute interval, the first frame of the video will be displayed when the Scene Manager time is equal to Interval Start Time. Similarly, when Scene Manager time is equal to Interval End Time, the last frame of the video will be displayed. Intermediate times within that interval are mapped linearly to the frames in the video.