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2. add decoder api UT for EC: Disable/Enable EC 3. Fix a decoder bug when EC is disabled itoltalMbDec should be set to zero when encouter a new sequence/picture, even when EC is disabled.
2. add decoder api UT for EC: Disable/Enable EC 3. Fix a decoder bug when EC is disabled itoltalMbDec should be set to zero when encouter a new sequence/picture, even when EC is disabled.