
Video sequence layer
An MPEG bitstream must be constructed such that the
decoder's buffer doesn't overflow: If it did, bits would
be lost. The bitstream must also be constructed so that
the buffer doesn't unclerflow: If it did, a picture to be
displayed would not be available at the required time.
Buffer management in AAPEG-2 is based upon an ideal-
ized model of the decoder's buffer: All of the bits asso-
ciated with each picture are deemed to be extracted
from the decoder's buffer at a certain precisely defined
instant in time with respect to the bitstream. Every
encoder implements ...