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==Profiles and levels==
A video coding format can define optional restrictions to encoded video, called [[profile (engineering)|profile]]s and levels. It is possible to have a decoder which only supports decoding a subset of profiles and levels of a given video format, for example to make the decoder program/hardware smaller, simpler, or faster.
A ''profile'' restricts which encoding techniques are allowed. For example, the H.264 format includes the profiles ''baseline'', ''main'' and ''high'' (and others). While [[Video compression picture types|P-slices]] (which can be predicted based on preceding slices) are supported in all profiles, [[Video compression picture types|B-slices]] (which can be predicted based on both preceding and following slices) are supported in the ''main'' and ''high'' profiles but not in ''baseline''.<ref name="adobe"/>
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