Specifies how the <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream.html' cref='IAgStkGraphicsVideoStream'>Video Stream</a> will playback. When the <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~Playback.html' cref='IAgStkGraphicsVideoStream.Playback'>Playback</a> is set to <a href='AgSTKGraphicsLib~Enumerations~AgEStkGraphicsVideoPlayback_EN.html' cref='AgEStkGraphicsVideoPlayback'>RealTime</a>, the video will playback in real time. When the <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~Playback.html' cref='IAgStkGraphicsVideoStream.Playback'>Playback</a> is set to <a href='AgSTKGraphicsLib~Enumerations~AgEStkGraphicsVideoPlayback_EN.html' cref='AgEStkGraphicsVideoPlayback'>TimeInterval</a>, the video will seek to the frame that corresponds linearly to the current <a href='AgSTKGraphicsLib~IAgStkGraphicsSceneManager.html' cref='IAgStkGraphicsSceneManager'>Scene Manager</a> time within the interval defined by <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~IntervalStartTime.html' cref='IAgStkGraphicsVideoStream.IntervalStartTime'>Interval Start Time</a> and <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~IntervalEndTime.html' cref='IAgStkGraphicsVideoStream.IntervalEndTime'>Interval End Time</a>. For instance, if the video contains 60 frames and the <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~IntervalStartTime.html' cref='IAgStkGraphicsVideoStream.IntervalStartTime'>Interval Start Time</a> and <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~IntervalEndTime.html' cref='IAgStkGraphicsVideoStream.IntervalEndTime'>Interval End Time</a> specify a 60 minute interval, the first frame of the video will be displayed when the <a href='AgSTKGraphicsLib~IAgStkGraphicsSceneManager.html' cref='IAgStkGraphicsSceneManager'>Scene Manager</a> time is equal to <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~IntervalStartTime.html' cref='IAgStkGraphicsVideoStream.IntervalStartTime'>Interval Start Time</a>. Similarly, when <a href='AgSTKGraphicsLib~IAgStkGraphicsSceneManager.html' cref='IAgStkGraphicsSceneManager'>Scene Manager</a> time is equal to <a href='AgSTKGraphicsLib~IAgStkGraphicsVideoStream~IntervalEndTime.html' cref='IAgStkGraphicsVideoStream.IntervalEndTime'>Interval End Time</a>, the last frame of the video will be displayed. Intermediate times within that interval are mapped linearly to the frames in the video.