Abstract: A method of generating an object oriented interactive multimedia file, including encoding data comprising at least one of video, text, audio, music and/or graphics elements as a video packet stream, text packet stream, audio packet stream, music packet stream and/or graphics packet stream respectively, combining the packet streams into a single self-contained object, said object containing its own control information, placing a plurality of the objects in a data stream, and grouping one or more of the data streams in a single contiguous self-contained scene, the scene including format definition as the initial packet in a sequence of packets. An encoder for executing the method is provided together with a player or decoder for parsing and decoding the file, which can be wirelessly streamed to a portable computer device, such as a mobile phone or a PDA.