A mode mapping and optimized mv conjunction based H.264/SVC to H.264/AVC transcoder with medium-grain quality scalability for videoconferencing

Lei Sun, Zhenyu Liu, Takeshi Ikenaga

Research output: Contribution to journalArticle

Abstract

Scalable Video Coding (SVC) is an extension of H.264/AVC, aiming to provide the ability to adapt to heterogeneous networks or requirements. It offers great flexibility for bitstream adaptation in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC is necessary due to the existence of legacy AVCbased systems. The straightforward re-encoding method requires great computational cost, and delay-sensitive applications like videoconferencing require much faster transcoding scheme. This paper proposes a 3- stage fast SVC-to-AVC transcoder with medium-grain quality scalability (MGS) for videoconferencing applications. Hierarchical-P structured SVC bitstream is transcoded into IPPP structured AVC bitstream with multiple reference frames. In the first stage, mode decision is accelerated by proposed SVC-to-AVC mode mapping scheme. In the second stage, INTER motion estimation is accelerated by an optimized motion vector (MV) conjunction method to predict the MV with a reduced search range. In the last stage, hadamard-based all zero block (AZB) detection is utilized for early termination. Simulation results show that proposed transcoder achieves very similar coding efficiency to the optimal result, but with averagely 89.6% computational time saving.

Original languageEnglish
Pages (from-to)501-509
Number of pages9
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE97-A
Issue number2
DOIs
Publication statusPublished - 2014

Fingerprint

Scalable video coding
Video Coding
Scalability
Transcoding
Motion Vector
Mode Decision
Early Termination
Legacy Systems
Legacy systems
Heterogeneous networks
Heterogeneous Networks
Motion Estimation
Motion estimation
Computational Cost
Encoding
Coding
Flexibility
Predict
Necessary
Requirements

Keywords

  • MGS scalability
  • Mode mapping
  • MV conjunction
  • SVC-to-AVC transcoding
  • Videoconferencing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Graphics and Computer-Aided Design
  • Applied Mathematics
  • Signal Processing

Cite this

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