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ITU-T Recommendation H.263 "Video Coding for Low Bitrate Communication", Dec. 1995
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based on H.261 (MPEG-like method)
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spectral redundancy: luminance + 2 color difference components - YUV (CCIR Recommendation 601)
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spatial redundancy: blocked DCT transform coding (JPEG-like), Syntax-based Arithmetic Coding
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temporal redundancy: half-pixel block motion prediction and compensation, Unrestricted Motion Vectors, Advanced Prediction, PB-frames
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stream hierarchy: [I|P|PB]-frame, group of macroblocks, macroblock (motion vectors), block (8x8 DCT coefficients)
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random access: to I-frame, implementor decides where to insert I-frame
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