This paper presents the error concealment (EC) feature implemented by the authors in the test model of the draft ITU-T video coding standard H.26L. The selected EC algorithms are based on weighted pixel value averaging for INTRA pictures and boundary-matching-based motion vector recovery for INTER pictures. The specific concealment strategy and some special methods, including handling of B-pictures, multiple reference frames and entire frame losses, are described. Both subjective and objective results are given based on simulations under Intemet conditions. The feature was adopted and is now included in the latest H.26L reference software TML-9.0.

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Video content creation and consumption have been increasingly available for the masses with the emergence of handheld devices capable of shooting, downloading, and playing videos. Video editing is a natural and necessary operation that is most commonly employed by users for finalizing and organizing their video content. With the constraints in processing power and memory, conventional spatial domain video editing is not a solution for mobile applications. In this paper, we present a complete video editing system for efficiently editing video content on mobile phones using compressed domain editing algorithms. A critical factor from usability point of view is the processing speed of the editing application. We show that with the proposed compressed domain editing system, typical video editing operations can be performed much faster than real-time on today's S60 phones.

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