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ref: 7c0369da239abcbceba5bce857055f99e8d89329 parent: 82b70b34fe3ca03af1e7f79aa92d85e6917454d1 author: ruil2 <ruil2@cisco.com> date: Thu Nov 27 10:55:48 EST 2014
add iBitsVaryPercentage parameters to control bitrate