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Minimum variance optimal rate allocation for multiplexed H.264/AVC bitstreams.

Marco Tagliasacchi1, Giuseppe Valenzise, Stefano Tubaro

  • 1Dipartimento de Elettronica e Informazione, Politecnico di Milano, Milan, Italy. marco.tagliasacchi@polimi.it

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|July 1, 2008
PubMed
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This study introduces a low-delay rate allocation scheme for transmitting multiple video streams under a constant bandwidth. Minimizing distortion variance, rather than average distortion, achieves smoother quality across sequences with minimal coding penalty.

Area of Science:

  • Video compression and transmission
  • Rate control algorithms
  • Multimedia signal processing

Background:

  • Efficiently transmitting multiple video streams requires careful bit budget allocation under bandwidth constraints.
  • Optimizing quality involves minimizing distortion, either on average or its variance, for consistent viewer experience.
  • Existing methods may not adequately address simultaneous quality smoothing across streams and over time.

Purpose of the Study:

  • To propose a low-delay rate allocation scheme for multi-stream video transmission.
  • To minimize distortion variance across video sequences for uniform quality.
  • To investigate the trade-offs between minimizing average distortion and distortion variance.

Main Methods:

  • Developed a low-delay rate allocation scheme operating in the rho-domain.

Related Experiment Videos

  • Derived closed-form solutions for rate allocation at each time instant.
  • Utilized a shared encoder buffer to manage rate fluctuations and temporal distortion smoothing.
  • Experimentally validated the scheme using H.264/AVC transcoded bitstreams.

    • Main Results:

    • The proposed scheme achieves distortion smoothing across multiplexed video sequences.
    • Minimizing distortion variance incurs a coding penalty of less than 0.5 dB in average PSNR compared to minimizing average distortion.
    • An explicit relationship between model parameters and coding penalty was established.
    • Temporal distortion smoothing was achieved using a shared encoder buffer.

    Conclusions:

    • The proposed rho-domain rate allocation scheme effectively smooths distortion both temporally and across multiple video streams.
    • Achieving distortion variance minimization offers consistent quality with a negligible coding efficiency loss.
    • The method is general and applicable to various video coding standards, demonstrated with H.264/AVC.