Global optimization of multiplexed video encoders
ICIP '97 Proceedings of the 1997 International Conference on Image Processing (ICIP '97) 3-Volume Set-Volume 1 - Volume 1
Statistical multiplexing using MPEG-2 video encoders
IBM Journal of Research and Development
Joint rate control for multi-program video coding
IEEE Transactions on Consumer Electronics
A mathematical analysis of the DCT coefficient distributions for images
IEEE Transactions on Image Processing
Optimum bit allocation and accurate rate control for video coding via ρ-domain source modeling
IEEE Transactions on Circuits and Systems for Video Technology
A linear source model and a unified rate control algorithm for DCT video coding
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
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This paper considers the problem of transcoding multiple video sequences in order to enable transmission across a channel characterized by a limited bandwidth. At each time instant, the available bit budget needs to be optimally allocated to the sequences in order to minimize the output average distortion. Nevertheless, this criterion does not guarantee that the quality of the reconstructed sequences is the same. Therefore, we seek for a solution that minimizes the output distortion variance, and we show that we achieve constant quality while keeping the penalty in average distortion small. We formulate this problem in the ρ-domain, and we show that the model parameters needed to solve the optimization problem can be easily extracted from the incoming compressed bitstreams. In addition, if a global video buffer can be accommodated, we show that it is possible to smooth the overall video quality along time. Experimental results on H.264/AVC compressed video data validate the performance of the proposed algorithm.