Context-adaptive variable-length coding:
Context-adaptive variable-length coding (CAVLC) is a form of entropy coding used in H.264/MPEG-4 AVC video encoding.
en.wikipedia.org
CAVLC:
適應性變動長度編碼法（Context-based Adaptive Variable-Length code，CAVLC，又稱UVLC）是H.264的演算法機制。
zh.wikipedia.org
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Context-adaptive variable-length codingCAVLC