We propose applying an adaptive context-tree weighting (CTW) method in the H.264 video coders. We first investigate two different ways to incorporating the CTW method into an H.264 coder and compare the coding effectiveness of using the method with that of using the context models specified in the H.264 standard. We then describe a novel approach for automatically adapting the CTW method based on the syntactic element to be coded and the encoding parameters. We show that our CTW-based arithmetic coding method yields similar or better compression results compared with the context-based adaptive arithmetic coding method used in H.264, without having to specify so many context models.
We briefly describe the process for creating an MP4 file and introduce the software tools used for the creation. Then, we describe the architecture of an MP4 player - Flavor Player - that implements the MPEG-4 Systems specification. The Flavor Player implements 2-D composition and depth ordering of objects, object animation, user interaction, MPEG-J, IPMP framework, and MP4 file support. Additionally, we describe a simplified version of the Flavor Player - Mild Flavor - that only implements the Object Descriptor Profile. Unlike the Flavor Player, Mild Flavor is also used to create and edit MP4 files in addition to playback.