H.264AVC error resilient video streaming using leaky prediction In this paper, we investigate the efficacy of the weighted prediction feature provided within H.264AVC video coding standard for error resilient video streaming. Leaky prediction has been proposed for scalable and nonscalable video coding to effectively combat transport errors. However, all prior results are based on non standard coding methods and no results have been available on the effectiveness of leaky prediction that is supported by a video coding standard. The weighted prediction feature in H.264AVC was originally designed for improving the coding efficiency especially in presence of fading in video sequences. This paper presents a performance analysis of H.264AVC weighted prediction feature that balances the tradeoff between coding efficiency and error resilience. A theoretical analysis of ratedistortion performance of leaky prediction is provided and closedform ratedistortion functions are derived for the error free and error drift scenarios. The theoretical results conform well to the operational results with respect to different choices of the leaky factor.

Unequal error protection using wynerziv coding for error resilience Compressed video is very sensitive to channel errors. A few bit losses can derail the entire decoding process. Thus, protecting compressed video is imperative to enable visual communications. Since different elements in a compressed video stream vary in their impact on the quality of the decoded video, unequal error protection can be used to provide efficient protection. This paper describes an unequal error protection method for protecting data elements in a video stream, via a WynerZiv encoder that consists of a coarse quantizer and a Turbo coder based lossless Slepianwolf encoder. Data elements that significantly impact the visual quality of decoded video, such as modes and motion vectors as used by H.264, are provided more parity bits than coarsely quantized transform coefficients. This results in an improvement in the quality of the decoded video when the transmitted sequence is corrupted by transmission errors, than obtained by the use of equal error protection.