Intra/inter macroblock mode decision for error-resilient transcoding

Haiyan Shu, Lap Pui Chau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


When transmitting the precoded bitstream over an error-prone network, error-resilient transcoding is adopted to convert the bitstream to a resilient format for robust delivery. Intra refreshment is an efficient tool to reduce the dependency between frames and stop the channel error propagation. In the conventional scheme, the rate-distortion optimized macroblock mode decision is employed to adaptively determine the coding mode of each macroblock. However, this scheme only considers the channel error propagated from the previous frames to the current frame. As opposed to this traditional algorithm, this paper proposes a method which considers consecutive two frames in a sequence, thus taking the error propagation to the following frame into account. This enhances the overall robustness of the transcoded bitstream against the packet loss. Considering the availability of the next frame information, two cases are discussed respectively. Experimental results show that the proposed methods present quality improvement when compared with the conventional rate-distortion optimized error-resilient coding scheme under different test environments, and the PSNR improvement can reach as high as 0.9 dB.

Original languageEnglish
Pages (from-to)97-104
Number of pages8
JournalIEEE Transactions on Multimedia
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes


  • Channel distortion propagation
  • Intra refreshment
  • Rate-distortion optimization
  • Video transcoding

ASJC Scopus subject areas

  • Signal Processing
  • Media Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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