Developing PDA for low-bitrate low-delay video delivery

Pervasive wireless multimedia applications often require Personal Digital Assistants (PDAs) for processing and playback. The capability of PDAs, however, are generally much lower than desktop PCs. When these devices are used to play back video delivered over a network from a desktop server, their buffers can easily overflow, seriously degrading the video quality. In this paper, we report our implementation of some special stream processing techniques to deal with the capability mismatch between a PC and PDAs for low-delay live video streaming. These techniques are, the Selective Packet Drop (SPD) algorithm, the Game API (GAPI) optimization and the speed adaptation algorithm. All of them can be easily implemented. We show that our system provides much better video quality than systems without our techniques.