On-Demand Learning for a Wireless Campus
IEEE MultiMedia
A protocol with transcoding to support QoS over Internet for multimedia traffic
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 2
Efficient Rate Control Scheme Using Complexity of Macro Block for MPEG-2 Transcoder
IEICE - Transactions on Information and Systems
Adaptive streaming of combined audio/video content over wireless networks
MMNS'06 Proceedings of the 9th IFIP/IEEE international conference on Management of Multimedia and Mobile Networks and Services
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In this paper, a new rate control algorithm is introduced as a solution for fast rate control requirements in transcoding. The specific transcoding problem mentioned in this paper is referred to as bit-rate conversion. For video services in heterogeneous network environments, it is necessary to convert the bit-rate of a compressed video to match it to transmission channels of lower capacity. The transcoding of coded video streams by requantization in the DCT (discrete cosine transform) domain is considered as a promising technique for its low complexity and acceptable picture quality. We carried out extensive simulations for many kinds of video sequences to find a novel R-Q (rate-quantization) model in the requantization process and found a piecewise linearly decreasing model. Exploiting this model we propose an efficient rate control algorithm for fast transcoding. Since the proposed algorithm requires much lower complexity than conventional algorithms and inherently avoids additional steps of implementation for a scene adaptive rate control in the transcoder, it has a significant advantage as a rate control algorithm for transcoding