Digital Signal Processing Reference
In-Depth Information
used in MPEG-1. The trade-off is increased encoder and decoder
complexity and processing rates. This, plus the use of levels,
allows for standardized video-compression implementation of
various video resolutions and features.
Combinations of profiles and levels can be used. There are
many possible permutations defined in the MPEG-2 standard
e
the most common profile used is the main profile, which
defines the set of algorithms or decoding tools most frequently
used.
Table 15.3
Common MPEG-2 Level and Pro
le Permutations
Some of the features below are defined as part of profiles that
extend beyond the main profile.
15.1.1.1 MPEG-2 Support for 4:2:2
In MPEG-1, compression was performed on video in the 4:2:0
format. In MPEG-2, a 4:2:2 profile now allows the source video
to be in 4:2:2, which is commonly used in broadcast studio
