1. A method for processing a multimedia event, comprising: separating text components from a multimedia data stream associated with the multimedia event to yield separated text components; generating a plurality of semantically coherent text blocks from the separated text components using an automated multimedia content indexing and retrieval system, wherein at least one semantically coherent text block is generated by merging disconnected text blocks; identifying a target speaker based on audio features in the multimedia data stream to yield an identified target speaker; deriving a topic for each text block of the plurality of semantically coherent text blocks based on a set of topic category models to yield derived topics; and generating a multimedia description of the multimedia event based at least on the identified target speaker, the plurality of semantically coherent text blocks, and the derived topics, wherein the multimedia description comprises at least a timeline representation having a plurality of layers showing multiple categorizations of the multimedia data stream for each instance of time.