5. The video editing system of claim 4 , wherein the processor is further configured to convert the story into a sequence including a video track and a plurality of audio tracks of different types, wherein each clip in each segment is transformed into a span on a track.
5. The video editing system of claim 4 , wherein the processor is further configured to convert the story into a sequence including a video track and a plurality of audio tracks of different types, wherein each clip in each segment is transformed into a span on a track. 9. The video editing system of claim 5 , wherein spans on audio tracks are automatically created when a video clip specifies that corresponding audio tracks are to be used.