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An MPEG-2 To H.264 Transcoder In Baseline Profile

An MPEG-2 To H.264 Transcoder In Baseline Profile. HARDEEPSINH JADEJA UTA ID:1000721847. What is Transcoding. The operation of converting video in one format to another format.

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An MPEG-2 To H.264 Transcoder In Baseline Profile

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  1. An MPEG-2 To H.264 Transcoder In Baseline Profile HARDEEPSINH JADEJA UTA ID:1000721847

  2. What is Transcoding • The operation of converting video in one format to another format. • It is the ability to take existing video content and change the bitrate and/or resolution in order to view it on another video playback device

  3. Need for Transcoding • MPEG-2 [4] has been a widely accepted video coding standard for various applications ranging from DVD to digital tv. broadcast. • The most important goal of MPEG-2 was to make the storage and transmission of digital AV material more efficient. • However new H.264 AVC standard [13] has an even broader perspective to support high and low bit-rate multimedia applications on existing and future networks.

  4. Need for TranscodingContd… • H.264 requires half of the space to store video content when compared to MPEG-2[1]. • Hence there is need to find compatibility between MPEG-2 and H.264 devices.

  5. MPEG-2 Encoder/Decoder Fig.1MPEG-2 encoder/decoder [1]

  6. H.264 Encoder Fig.2 H.264 Encoder [9].

  7. Different MacroBlock sizes of H.264 for Motion Estimation Fig.3 Differentmacroblocks in H.264[8].

  8. Normal Method of motion estimation • In H.264, inter frame motion estimation is performed using different MB sizes from 16 × 16 to 4 × 4 [8]. • For each MB, all different sizes are evaluated and the one leading to the minimum rate-distortion (RD) cost is then selected. • This guarantees the optimal block size for the final encoding but at the expense of a high-computational cost.

  9. How is this transcoder Different? • Machine learning tools are used to exploit the correlation between the macroblock(MB) [1] decision of the H.264 video format and the distribution of the motion compensated residual in MPEG-2. • Dynamic motion window technique is also proposed to further speed-up the decision process.

  10. The Algorithm for motion estimation for proposed trancoder • The proposed MPEG-2 to H.264 transcoder consists of two parts: an MPEG-2 decoder followed by an H.264 encoder. • First, the transcoder fully decodes the MPEG-2 sequence, and the information required by the decision trees and the dynamic motion window mechanism is gathered during this stage. • The information is given as input to decision tree. • The H.264MB mode decision is replaced by a simple mode assignment.

  11. FAST MB MODE DECISION USING MACHINE LEARNING • Creating the Training Files Fig.4 Training algorithm for decision tree[2].

  12. Decision Trees Fig.5 Decision tree for deciding the macro block mode of H.264 encoder [1].

  13. Dynamic motion window • Adapting the search range based on the motion vector of the incoming MB could reduce the motion estimation[1]. • Dynamic motion window is combination of two methods. • Dynamic search range based on the length of the motion vectors in the MPEG-2 video [2]. • Orientation of the Motion vectors [2].

  14. Conclusions • Computational complexity of Inter prediction Motion estimation of H.264 encoder of transcoder can be reduced by 90% [1]. • Machine learning tool is WekaJ4.8 [3]. • Software used is JM reference software version 17.2 [8]. • MPEG-2V12 reference software for MPEG-2 [6].

  15. References • H. Kalva ,et al,”An MPEG-2 to H.264 video transcoder in the baseline profile.”IEEE Transactions on circuits and systems for video technology,vol-20,no-5,pp.763-768, May 2010. • G. Fernández-Escribano, et al, “Reducing motion estimation complexity in MPEG-2 to H.264 transcoding,” in Proc. IEEE International Conference Multimedia Expo (ICME), Beijing, China, pp. 440–443 ,Jul. 2–5, 2007. • I. E. G. Richardson, “H.264/MPEG-4, part 10,” in H.264 and MPEG-4Video Compression, Hoboken, NJ: Wiley, pp. 159–223, 2003. • G. Fernández-Escribano, et al, “A fast MB mode decision algorithm for MPEG-2 toH.264 P-frame transcoding,” IEEE Transactions on circuits and systems for video technology,vol. 18, no. 2, pp. 172–185, Feb. 2008. • JM software -http ://iphome.hhi.de/suehring/tml/. • MPEG-2 software-http://www.mpeg.org/MPEG/video/mssg-free-mpeg-software.html. • M. Isnardi,”MPEG-2 video compression“ Sarnoff corporation ,Nov 29,1999. • W. W. Cohen and Y. Singer, “A simple, fast, and effective rule learner,” in Proc. 16th Natl. Conf. Artificial Intelligence, Orlando, FL, pp. 335–342, Jul. 18–22, 1999. • T. Wiegand,and Gary J. Sullivan, “Overview of H.264/AVC video coding standards,” IEEE Transactions on circuits and systems for video technology, vol. 13, no. 7,pp.560-576 July 2003.

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