Motion vector refinement for high-performance transcoding
IEEE Transactions on Multimedia
Heterogeneous video transcoding to lower spatio-temporalresolutions and different encoding formats
IEEE Transactions on Multimedia
An integrated source transcoding and congestion control paradigmfor video streaming in the Internet
IEEE Transactions on Multimedia
Video transcoding proxy for 3Gwireless mobile Internet access
IEEE Communications Magazine
Optimal mode selection and synchronization for robust video communications over error-prone networks
IEEE Journal on Selected Areas in Communications
Video coding with optimal inter/intra-mode switching for packet loss resilience
IEEE Journal on Selected Areas in Communications
Error-resilient transcoding for video over wireless channels
IEEE Journal on Selected Areas in Communications
Standard compatible extension of H.263 for robust video transmission in mobile environments
IEEE Transactions on Circuits and Systems for Video Technology
A frequency-domain video transcoder for dynamic bit-rate reduction of MPEG-2 bit streams
IEEE Transactions on Circuits and Systems for Video Technology
Precise and fast error tracking for error-resilient transmission of H.263 video
IEEE Transactions on Circuits and Systems for Video Technology
The CBERC: a content-based error-resilient coding technique for packet video communications
IEEE Transactions on Circuits and Systems for Video Technology
Error-resilient video transcoding for robust internetwork communications using GPRS
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
Low-delay and error-robust wireless video transmission for video communications
IEEE Transactions on Circuits and Systems for Video Technology
Journal of Visual Communication and Image Representation
Transcoding-based error-resilient video adaptation for 3G wireless networks
EURASIP Journal on Advances in Signal Processing
IEEE Transactions on Multimedia - Special issue on quality-driven cross-layer design for multimedia communications
Compressed-domain techniques for error-resilient video transcoding using RPS
IEEE Transactions on Image Processing
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Transmitting video data over wireless networks can be very unreliable due to packet-loss, leading to serious video quality degradation which is annoying to human perception. The lost packets not only affect the quality of current frame, but also lead to error propagation to subsequent frames due to motion-compensated prediction techniques used in standard video codecs. Adding error-resilience to a video bitstream for robust video delivery to users thus becomes a very important issue. In this work, we propose a two-pass intra-refresh transcoding scheme for inserting error-resilience features to a compressed video at the media gateway of a three-tier streaming system. The proposed transcoder can adaptively vary the intra-refresh rate according to the video content and the channel's packet-loss rate to protect the most important macroblocks (MBs) against packet loss. In the first-pass encoding, the encoder estimates the amount of error propagation at MB level, and then generates side information as transcoding hints for use at the transcoder. In the second-pass transcoding, the error-resilient transcoder adaptively determines the intra-refresh rate and the locations of MBs to perform intra-refresh according to the side information. Experimental results show that the proposed method can effectively mitigate the error propagation due to packet loss so as to improve the visual quality significantly. The proposed transcoder can also meet the real-time requirement.