Object based audio visual terminal and bitstream structure

Method for displaying video data / audio-visual based on objects, comprising: a) receiving, over time, a plurality of video objects / audiovisual and composition information for the objects, can accederseiendose such video objects / audiovisual and said composition information for said video objects / audiovisual in independientesseparados logical channels; b) storing in a cache (3) at least one of said objects; c) employing said composition information for composing (5) scenes from said objects including one of the objects stored in the cache; d) display (5) composite scenes; characterized in that at least one of said objects comprises a persistent object, said persistent object a period of life that extends beyond the time of initial presentation, until an expiration time, and in which one of these persistent objects it used repeatedly in a session is updated with appropriate update messages.