A New Transcoding Scheme for Scalable Video Coding to H.264/AVC
Abstract: Requests from
various video terminals push video servers to equip with scalability for video
contents distribution in different ways. Scalable Video Coding (SVC) as the
extension of H.264/AVC standard can provide the scalability for video servers
by encoding videos into one base layer and several enhancement layers. To
enable mobile devices without scalability receive videos at their best extent,
converting bit-streams from SVC into H.264/AVC becomes the key technique.
Bit-stream rewriting is the simplest way without quality loss. However,
rewriting is not a real transcoding scheme, since it needs to modify SVC encoders.
This paper proposes a novel transcoding approach to support spatial scalability
by minimizing the distortions generated from re-encoding process. The proposed
scheme keeps the input bit-streams’ information at maximum and adopts the
hybrid upsampling method to do residue scaling, which can reduce the
transcoding distortion into minimization. Experimental results demonstrate that
the loss of the rate-distortion (RD) performance of the proposed transcoding
scheme is better than Full Decoding Re-encoding (FDR) which can get the highest
video quality in general sense, by achieving up to 0.9 dB Y-PSNR gain while
saving 95%~97% processing time.
Author: Zhenyu Wu, Daiying
Zhou, Hong Hu
Journal Code: jptkomputergg130086
