MPEG-4 to H.264 transcoding with frame rate reduction

Authors:
Yung-Ki Lee;Seong-Seon Lee;Yung-Lyul Lee
Affiliations:
Department of Internet Engineering, School of Computer Engineering, DMS Lab., Sejong University, Seoul, South Korea 143-747;Department of Internet Engineering, School of Computer Engineering, DMS Lab., Sejong University, Seoul, South Korea 143-747;Department of Internet Engineering, School of Computer Engineering, DMS Lab., Sejong University, Seoul, South Korea 143-747
Venue:
Multimedia Tools and Applications
Year:
2007

Citing 6
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Abstract

In this paper, a temporal resolution reduction transcoding method that transforms an MPEG-4 video bitstream into an H.264 video bitstream is proposed. The block modes and motion vectors in the MPEG-4 bitstream are utilized in the H.264 encoder for the block mode conversion and motion vector interpolation methods. Four types of motion vector interpolation methods are proposed in order to avoid the use of brute-force motion estimation in H.264. According to the experimental results, the proposed methods achieve a 3~4 times improvement in the computational complexity compared to the cascade pixel-domain transcoding method, while the PSNR (peak signal to noise ratio) is degraded by 0.2~0.9 dB depending on the bitrates.