Video compression 91 forward group of pictures video
Video compression 91 forward group of pictures video sequence I-frame P-frame B-frame backward forward predicated from previous I or P frames Spatial compression only predicated from previous or next frames Figure 5.5 I, P, and B frames. So that the decoder can make backward prediction from a future frame, the natural frame order is resequenced. The B-frames are transmitted after the next and previous pictures that each references. MPEG-4 natural video encoding MPEG-4 is the first MPEG system that supports streaming as part of the standard. The ability to stream is not related to the method of compression, but instead to the way that the video sequence is time-referenced, so that the media server can control the delivery rate to the player. The requirements for the standard were for a flexible multimedia encoding format designed to support a very wide range of bit rates, from 5 Kbit/s up to 50 Mbit/s. This is sufficiently flexible to cover low bit rate wireless data through to HDTV applications. Version 1 MPEG-4 supports the following formats and bit rates: Bit rates Typically between 5 kbit/s and 10 Mbit/s Scan formats Interlaced as well as progressive video Resolutions Typically from sub-QCIF to beyond HDTV
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