HELP! * GREY=local LOCAL HTML version of Foils prepared December 2,95

Foil 8 Video Compression (2)

From Video Server,Delivery and Compression Technologies SC95 Tutorial on Web Technologies -- December 4,95. by NPAC Team * See also color IMAGE

Frameworks (2):
  • Motion JPEG: not really a standard. High-quality frame-preserving codec, relatively low compressions rates
    • Leading technology for non-linear video editing (AVID), broadcast quality video, mostly SW but HW decoders emerging. AvidNet (a.k.a. MediaNet) network support
    • Limited standardization. Recent initiatives: Digital Media Language (DML) and Open Media Framework (OMF)
  • MPEG: both a codec and delivery framework; international standard; Telcos and cable TV industry pick for network digital video
    • complex codec using both intra and inter frame compression; encoding very CPU intensive; encoding algorithm not part of the standard, both Constant Bit Rate and Variable Bit Rate supported; variable quality up to HDTV
    • system stream carries both video and audio (6 channels for MPEG-2); suitable for both disk and network delivery; difficult to handle in interactive titles
    • 3 different flavors: MPEG-1, MPEG-2, MPEG-4
    • Web reference: http://www.crs4.it/luigi/MPEG/mpegfaq.html



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