Video Coding Layer
YCbCr Color Space
MPEG-2 uses the YCbCr color space, supporting 4:2:0, 4:2:2, and 4:4:4 sampling. The 4:2:2 and 4:4:4 sampling options increase the chroma resolution over 4:2:0, resulting in better picture quality.
Coded Picture Types
There are three types of coded pictures. I (intra) pictures are fields or frames coded as a stand-alone still image. They allow random access points within the video stream. As such, I pictures should occur about two times a second. I pictures also should be used where scene cuts occur.
P (predicted) pictures are fields or frames coded relative to the nearest previous I or P picture, resulting in forward prediction processing. P pictures provide more compression than I pictures, through the ...
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