Idea

Before recording animation, we would like to preview what we are going to record. For example, when there is flypath set, we want to make sure that right object is focused at the right timing. Also, we want to check that paticular point which may happen 5min later after start recording, but currently, we need to wait 5min. If we can run with fast forward, we can check all those points quickly, and finish video recording process much faster. Video file is NOT needed at preview mode.