Adaptive video transcoding and streaming over wireless channels
Journal of Systems and Software - Special issue: Adaptive multimedia computing
Comparative analysis of a twin-class M-QAM transmission system for wireless video applications
Multimedia Tools and Applications
A cross-layer framework for efficient streaming of H.264 video over IEEE 802.11 networks
Journal of Computer Systems, Networks, and Communications
An embedded and programmable system based FPGA for real time, MPEG stream buffer analysis
IEEE Transactions on Circuits and Systems for Video Technology
Adaptive computation control of variable complexity Fano decoders
IEEE Transactions on Communications
Operational distortion-quantization curve-based bit allocation for smooth video quality
Journal of Visual Communication and Image Representation
Hi-index | 0.00 |
In video distribution services, various networks of different capacity may be linked together to form the branches of a multicasting tree. In order to efficiently use the available bandwidth of each subnetwork, a video transcoder capable of reducing the bit rate of the incoming bit stream must be used at those nodes whose output links have less bandwidth than the input one. In this paper, we analyze the buffering implications of inserting a video transcoder within the transmission path. For transcoders with either fixed or variable compression ratio, we show that the encoder buffer size can be maintained as if no transcoder existed while the decoder has to modify its own buffer size according to both the bit rate conversion ratio and transcoder buffer size. We derive the conditions that have to be met by both the encoder and transcoder buffers for preventing the decoder buffer from underflowing or overflowing. Furthermore, based on the characteristics of constant bit rate (CBR) MPEG coded video, we show that efficient bit rate control can be implemented in CBR video transcoders such that the picture quality of transcoded sequences is practically the same as those directly encoded from the original sequence at the same reduced bit rates