视频P帧和B帧都丢drop = true
delta
音频和视频I帧不丢drop = false
now
lastStreamTime
baseTolerance5000
midTolerance6500
timeStamp
系统时间轴
clockStartTime
highestTolerance8000
lastMessageTs
时间戳时间轴
音频和视频都不丢drop = false
clockTimeOfMessage=clockStartTime+delta
playbackStart
视频B帧丢drop = true
0
streamStartTime
音频和视频都丢drop = true