Autodesk 64006-051108-9001 User Guide - Page 272
NTSC National Television Standards Committee, Multimedia Architecture
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264 Glossary MPEG-4 - QuickTime 6 provides a new video codec for MPEG-4 video compression. It can provide an extremely low data rate of 64 kbits/second. Interoperability is the primary goal of the new codec. Multicast - transmitting the same media stream simultaneously to many recipients. Multicast delivery is similar to traditional television broadcast, in the sense that a stream is made available at a given time, and viewers may watch the part of that stream that is currently playing. Multicast delivery results in less network traffic than Unicast delivery because the signal is sent once; viewers watch this signal as it is sent instead of initiating multiple unique streams. Multicast is not yet supported by many networks. Multimedia - media presentations that combine various elements such as sound, graphics and video. Multimedia Architecture - software, including system extensions, plug-ins, servers, etc., that provides for the creation, storage and playback of synchronized multiple media types. QuickTime, Real and Windows Media are examples of multimedia architectures. Multiplexing (a.k.a. Muxing or Interleaving) - process of combining audio and video data in a final MPEG file. See Interleaving. Noise - any part of a signal that contains unwanted randomness. In audio, noise makes the track have hiss or fuzz. In video, it can make the image grainy, and appear as pixel shimmer or blotchy areas. Noise generally interferes with compression and should be minimized for good results. Noise Reduction - removing unwanted noise from a signal. For video this is accomplished with filters such as blur, mean or median. Uniform noise reduction applies one filter equally to each pixel. Adaptive Noise Reduction applies different filters to different kinds of noise. NTSC (National Television Standards Committee) - defines North American broadcast standards. The term NTSC video refers to the video standard defined by the committee, that has a specifically limited color gamut, is interlaced and is typically 720x486 pixels, 29.97 fps.
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