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Many standards contain different configurations of
capabilities – often based in “profiles” & “levels”
• A profile is usually a set of algorithmic features
• A level is usually a degree of capability
(e.g. resolution or speed of decoding)
H.264/AVC has three profiles
• Baseline (lower capability plus error resilience, e.g., videoconferencing, mobile video)
• Main (high compression quality, e.g., broadcast)
• Extended (added features for efficient streaming)
Profiles & Levels Concepts
Video coding layer is based on hybrid video
coding and similar in spirit to other standards
but with important differences
Some new key aspects are:
• Enhanced motion compensation
• Small blocks for transform coding
• Improved de-blocking filter
• Enhanced entropy coding
! Substantial bit-rate savings relative to other
standards for the same quality
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