Bridging the Gap Between CBR and VBR for H264 Standard

This paper provides a flexible way of controlling Variable-Bit-Rate (VBR) of compressed digital video, applicable to the new H264 video compression standard. The entire video sequence is assessed in advance and the quantisation level is then set such that bit rate (and thus the frame rate) remains within predetermined limits compatible with the bandwidth of the transmission system and the capabilities of the remote end, while at the same time providing constant quality similar to VBR encoding. A process for avoiding buffer starvation by selectively eliminating frames from the encoded output at times when the frame rate is slow (large number of bits per frame) will be also described. Finally, the problem of buffer overflow will be solved by selectively eliminating frames from the received input to the decoder. The decoder detects the omission of the frames and resynchronizes the transmission by monitoring time stamps and repeating frames if necessary.

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References:
[1] Kai Sun, Mohammed Ghanbari, Ian Henning, Matthew Walker, Othon
Kamariotis "A stored VBR video transmission scheme over Internet",
PacketVideo 2003
[2] Yue Yu, Jian Zhou ,Yiliang Wang,Chang Wen Chen. "A novel two-pass
VBR coding algorithm for fixed-size storage application", Circuits and
Systems for Video Technology, IEEE Transactions on Publication Date:
March 2001 On page(s): 345 - 356, Volume: 11, Issue: 3, ISSN: 1051-
8215, Reference Cited: 16
[3] Jianfei Cai , Chang Wen Chen. "Optimal bit allocation for low bit rate
video streaming applications", Image Processing, 2002. Proceedings.
2002 International Conference on Publication Date: 2002,On page(s): I-
73- I-76 vol.1, Volume: 1, ISSN: 1522-4880, Number of Pages: 3 vol
(lxx+991+976+1008)
[4] PH Westerink, R. Rajagopalan and CA Gonzales. " Two-pass MPEG-2
variable-bit-rate encoding", IBM Journal of Research and Development,
vol.43, no.4, July 1999 pp pp 471-88
[5] N. Mohsenian, R. Rajagopalan, C. A. Gonzales. "Single-pass constantand
variable-bit-rate MPEG-2 video compression", IBM Journal of
Research and Development, vol.43, no.4, July 1999 pp pp 489.
[6] M. R. Pickering and J. F. Arnold, "A perceptually efficient VBR rate
control algorithm," IEEE Trans. Image Processing, vol. 3, pp. 527-532,
Sept. 1994
[7] Liew, S.C.; Tse, D.C.-Y. "A control-theoretic approach to adapting VBR
compressed video for transport over a CBR communications channel"
Networking, IEEE/ACM Transactions on, Volume: 6, Issue:
1, Feb.1998, Pages: 42-55.