The symbol that actually occurs is encoded relative to its predicted distribution using arithmetic coding.
对于实际出现的符号，会使用算术编码，相对于其预测分发进行编码。
As far as I can tell, it chooses an arithmetic coding context based on the neighboring MVs, then decides which of the predicted motion vectors to use, or whether to code a delta instead.
据我所知道的，它基于临近的MV选择了一个算术编码上下文，然后决定使用哪个运动矢量，或是否计算出一个差值来代替。
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