AVS trick modes for PVR and VOD services
AVS1-P2 is a recently completed video compression standard developed by the Audio and Video Coding Standard (AVS) Workgroup of China. The standard promises comparable compression efficiency to the H.264/MPEG-4 AVC video codec with lower implementation complexity and royalty fees. AVS1-P2 is the Chinese next generation national video coding standard with an increasing amount of industrial importance as it is being required for different applications and services. It is expected that AVS1-P2 will be prominent in emerging Chinese digital video application markets, especially for personal video recorder (PVR) and video on demand (VOD). This paper discusses how trick modes for PVR and VOD can be performed with AVS1-P2 content. It begins with generating an index table to facilitate AVS1-P2 trick modes followed by a discussion of basic and advanced trick modes. Next, the minimum decoder speed and display frame buffer requirements are analyzed for smooth trick play, especially for 1 rewind. VOD stream delivery strategies for various trick modes and transitions are then discussed. Finally, an overview of other topics that may affect implementation such as content protection and encoding is provided. Many of the discussions are also applicable to other video coding standards like MPEG-2, H.264/AVC, etc.
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