A method and apparatus for buffering streamed presentation data within a container file includes receiving one or more data streams from each of one or more presentation sources within the presentation, creating within the container file a virtual file for each of the one or more presentation sources, temporarily storing first data associated with a first data stream of a first presentation source in association with a first virtual file corresponding to the presentation source, determining a container file size, and temporarily storing additional data from the first data stream in place of at least a portion of the first data if the container file size is within a predetermined range of an identified maximum buffer size.