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2008

Minimum Variance Optimal Rate Allocation for Multiplexed H.264/AVC Bitstreams

8 years 11 months ago
Minimum Variance Optimal Rate Allocation for Multiplexed H.264/AVC Bitstreams
Consider the problem of transmitting multiple video streams to fulfill a constant bandwidth constraint. The available bit budget needs to be distributed across the sequences in order to meet some optimality criteria. For example, one might want to minimize the average distortion or, alternatively, minimize the distortion variance, in order to keep almost constant quality among the encoded sequences. By working in the -domain, we propose a low-delay rate allocation scheme that, at each time instant, provides a closed form solution for either the aforementioned problems. We show that minimizing the distortion variance instead of the average distortion leads, for each of the multiplexed sequences, to a coding penalty less than 0.5 dB, in terms of average PSNR. In addition, our analysis provides an explicit relationship between model parameters and this loss. In order to smooth the distortion also along time, we accommodate a shared encoder buffer to compensate for rate fluctuations. Altho...
Marco Tagliasacchi, Giuseppe Valenzise, Stefano Tu
Added 15 Dec 2010
Updated 15 Dec 2010
Type Journal
Year 2008
Where TIP
Authors Marco Tagliasacchi, Giuseppe Valenzise, Stefano Tubaro
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