A file for storing digital data with high compression rate stores digital
data for video and audio signals in multiple streams interleaved with
each other. Each track has a stream descriptor list and a stream data
list. The stream descriptor list includes a stream header chunk, a stream
format chunk, and a stream name chunk. For a video stream, the stream
descriptor list also includes a stream header data chunk if the video
stream is under digital rights management (DRM) protection. The file
format is compatible with high level data compressing algorithms, such as
MPEG-4, which provide data compression ratio about six to ten times
higher than a standard DVD format.