Patent ID: 7779159

Claim:
An apparatus for downloading a multimedia file, comprising: a file converter to convert a larger multimedia file into a smaller multimedia file in response to a request for download service of media content at a selected bit rate, wherein the larger file includes multiple tracks of same media content at different bit rates including the selected bit rate, wherein media data of the same media content for one track is interleaved with media data of the same media content for one or more other tracks in the larger multimedia file, and wherein the file converter performs said conversion by: selectively deleting meta information relating to one or more unselected bit rates in a header portion of the larger file, and selectively deleting the interleaved media data relating to the one or more unselected bit rates in an mdat portion of the larger file, said method further comprising: changing media content indicator values in headers of remaining non-deleted media data, corresponding to the media content at the selected bit rate, from one or more first values to a same second value, said same second value providing an indication that at least adjacent ones of the non-deleted media data include different media content, and adjusting a spatial position value of the remaining non-deleted media data that corresponds to the media content at the selected bit rate in an mdat portion of the larger multimedia file, the spatial position value being adjusted to place the previously interleaved non-deleted media data into contiguous positions in the smaller multimedia file based on the selective deletion of the media data relating to the one or more unselected bit rates, wherein the file converter is coupled to a transmitter for transmitting the smaller multimedia file to a terminal.