Description

This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.

111 How are interlaced and progressive pictures indicated in MPEG? (MPEG-2)

The following tree may help illustrate the possible layers of
progressive and interlaced coding modes:

          MPEG-2 sequence
         /               \
  progressive            interlaced sequence
  sequence                 /            \
                   Field picture        Frame picture
                                        /         \
                                       /           \
                 Frame or field prediction     Frame MB prediction only
                   /               \
               Field dct           Frame dct 

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