VP8 is simply way too similar to H.264: a pithy, if slightly inaccurate, description of VP8 would be “H.264 Baseline Profile with a better entropy coder”.
VP8与H.264太像了：一言以蔽之，如果描述不那么严格的话，可以将VP8看作是“一个带有更好的熵编码的H.264 Baseline Profile”。
A context based arithmetic coder is adopted in entropy coding, and four different sets of models are designed for the arithmetic coder.
熵编码采用了基于上下文的算术编码，提出了四种上下文编码模型。
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