H264 to VC 1 Transcoding.ppt

to VC 1 Transcoding Vidhya Vijayakumar Multimedia Processing Lab MSEE, University of Texas @ Arlington vidhya.******@ Guided by Dr. KR Rao What is …? – The new industry standard – Massive quality, Minimal files – Scalable from 3G to HD and Beyond ? VC 1 – Informal name of the SMPTE 421M video codec – Standard initially developed by Microsoft – Supported standard for HD DVDs , Blu -ray Discs , and Windows Media Video What is …? Transcoding – Converting a pressed video signal into another one with different format ? Change in bit rate, frame rate, frame size, or even compression standard – 2 Ways ? Decode fully and encode in target standard ? Change the bit stream format from one standard to another without its undergoing plete decoding and encoding process. – Limitations ? Compression artifacts are cumulative Why Trancode to VC-1? ? The two high definition DVD formats HD-DVD and Blue ray have mandated MPEG-2, and VC-1 as pression formats ? As based and VC-1 based content and products e available, transcoding in both directions will e widely used capabilities. ? From an end user point of view, any VC-1 decoder can now e twice as powerful as it was earlier. Why VC1? ? Requires putational power and can be decoded at full 1080i/p resolution on today ’ s off-the-shelf PC ? Advanced Profile pression efficiencies far superior to MPEG-2 ? Delivers HD content at bit rates as low as 6-8 Mbps ? Better visual quality against and MPEG-2 demonstrated in independent tests More of VC1 …? DCT-based video codec design ? Coding tools for interlaced video sequences as well as progressive encoding ? 8-bit, 4:2:0 format ? Uses block based transform and motion compensation with quantization and entropy coding. Decoder – Simple & Main profile Decoder – Advanced Profile Block Transforms (Integer DCT) ? 8x8 blocks can be encoded using 1_8x8 2_8x4 2_4x8 4_4x4 ? Frame / Macroblock/Bl