Performance analysis of Dirac video AVSChina video and AAC audio codec Under guidance of Dr K R Rao Submitted By ASHWINI S URS ID 1000646070 Outline Overview of Dirac video codec Overview of AVS china video codec Overview of AAC audio codec Performance of Dirac codec Performance of AVS China video codec Performance of AAC audio codec Conclusion Future Work References Overview of Dirac video codec Dirac 1 is a hybrid video codec developed by British Broadcasting Corporation BBC Dirac is a hybrid video codec because it involves both transform and motion compensation The key feature of Dirac is that it is an open technology which means that the technology can be used without payment of licensing fees Dirac uses modern techniques like wavelet transform and arithmetic coding for entropy coding The applications of Dirac range from high definition television HDTV to web streaming due to its flexibility Fig 1 Block Diagram of Dirac Encoder 1 Overview of AVS China video codec Audio video coding standard AVS is a working group of audio and video coding standard in China which was established in 2002 Based on versatile applications in the area of video AVS china is categorized into various profiles 16 AVS china consists of four profiles namely Jizhun base profile Jiben basic profile Shenzhan extended profile and Jiaqiang enhanced profile defined in AVS video targeting to different applications Table 2 16 AVS china has different parts for various categories AVS Part2 defines Jizhun profile Jizhun profile is preferable for high coding efficiency on video sequences of higher resolutions at the expense of moderate computational complexity Part Category 1 System 2 Video 3 Audio 4 Conformance test 5 Reference Software 6 Digital media rights management 7 Mobile video 8 Transmit AVS via IP network 9 AVS file format 10 Mobile speech and audio coding Table 1 Different Parts of AVS china Profiles Key applications Jizhun profile base Television broadcasting HDTV etc Jiben profile basic Mobility applications etc Shenzhan profile extended Video surveillance etc Jiaqiang profile enhanced Multimedia entertainment etc Table 2 Application based profiles of AVS 16 G O P Sequence Picture Slice Block Macro block Fig 2 Typical AVS China video coding Chain Fig 3 Block diagram of AVS china encoder 15 Overview of AAC AAC 2 consists of three profiles namely main profile low complexity profile and scalable sampling rate SSR profile The key feature of low complexity profile is it deletes the prediction tool and reduces the temporal noise shaping tool in complexity Supports sample frequencies from 8 kHz to 96 kHz official MP3 16 kHz to 48 kHz 4 Superior performance at bit rates 64 kbps and at bit rates reaching as low as 16 kbps Improved compression provides higher quality audio with smaller bit rates AAC can accommodate two basic bit stream formats Audio data interchange format ADIF and Audio data transport stream ADTS 10 Fig 5 Block Diagram AAC Encoder 7 Performance analysis of Dirac video codec QCIF sequence Akiyo 4 2 0 format Total No of frames 300 frames Frames used 150 frames Width 176 Height 144 Frame rate 30fps QF Original File Size KB Compressed File Size KB Compression Ratio Bit rate KBps Y MSE Y PSNR dB Y SSIM 0 1 2 3 4 5 6 7 8 9 10 Lossless 5569 5569 5569 5569 5569 5569 5569 5569 5569 5569 5569 5569 26 28 29 31 36 42 51 66 87 118 180 1277 214 1 199 1 192 1 180 1 155 1 133 1 109 1 84 1 64 1 47 1 31 1 4 1 5 15 5 42 5 64 6 12 7 03 8 23 10 17 13 06 17 25 23 60 35 95 255 21 113 787 83 374 67 414 51 613 32 882 19 062 10 746 6 128 3 421 2 277 1 632 0 000 27 570 28 920 29 843 31 003 32 961 35 329 37 818 40 257 42 790 44 557 46 003 100 000 0 799 0 840 0 870 0 896 0 924 0 948 0 968 0 978 0 986 0 990 0 992 1 000 Table 3 Performance of Dirac for Akiyo test sequence 150 frames Original Sequence Recon image QF 10 Recon image QF 0 Recon image lossless mode CIF sequence Tempete 4 2 0 format Total No of frames 260 frames Frames used 90 frames Width 352 Height 288 Frame rate 30fps QF 0 1 2 3 4 5 6 7 8 9 10 Lossless Original File Size KB 13365 13365 13365 13365 13365 13365 13365 13365 13365 13365 13365 13365 Compressed File Size KB 67 76 92 117 158 224 331 505 793 1185 1776 7866 Compression Ratio 199 1 176 1 145 1 114 1 85 1 60 1 40 1 26 1 17 1 11 1 8 1 2 1 Bit rate KBps 22 09 25 21 30 39 38 71 52 38 74 45 110 16 168 33 264 20 394 73 591 94 2621 98 Y MSE 398 811 305 017 208 276 136 118 84 964 50 610 31 533 20 159 12 021 6 945 3 808 0 000 Y PSNR dB 22 123 23 288 24 944 26 792 28 838 31 088 33 143 35 086 37 332 39 714 42 324 100 000 Y SSIM 0 600 0 678 0 766 0 834 0 888 0 929 0 954 0 969 0 980 0 987 0 991 1 000 Table 4 Performance of Dirac for Tempete test sequence 90 frames Original sequence Recon sequence for QF 10 Recon sequence for QF 0 Recon sequence lossless mode SDTV sequence Night move 4 2 0 format Total No of frames 800 frames Frames used 60 frames Width 704 Height 576 Frame rate 25fps QF Original File Size KB Compressed File Size KB Compression Ratio Bit rate KBps Y MSE Y PSNR dB Y SSIM 0 35640 192 186 1 79 59 81 703 29 008 0 718 1 35640 295 121 1 122 59 63 850 30 079 0 735 4 35640 593 60 1 246 73 36 632 32 492 0 776 7 35640 1825 20 1 760 31 24 900 34 169 0 816 10 35640 6572 5 1 2738 13 7 941 39 132 0 934 Lossless 35640 24007 2 1 10002 79 0 000 100 00 1 000 Table 5 Performance of Dirac for Night move test sequence 60 frames Night move original seq at 30th frame Night move seq at qf 0 30th frame Night move seq lossless mode 30th frame HDTV sequence Harbor sequence 4 2 0 format Total No of frames 121 frames Frames used 60 frames Width 1280 Height 720 Frame rate 25fps QF Original File Size KB Compressed File Size KB Compression Ratio Bit rate KBps 0 81000 179 453 1 74 18 1 81000 226 358 1 94 03 4 81000 633 128 1 263 62 7 81000 2272 36 1 946 42 10 81000 8754 9 1 3647 39 lossless 81000 44424 2 1 18509 Table 6 Performance of Dirac for Harbor test sequence 60 frames Harbor seq original 30th …
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