它界定了视频帧每一行中有效视频的起始位置。
It demarcates the start of active video on each row of a video frame.
在提取过程中，通过对同步码的解码来定位水印信号嵌入的帧位置以及数据起始位置。
In the extract process, through the decoding of the synchronization code to locate the position of the watermark signal embedded in the frame as well as data starting position.
第二针：起始以右臂划水。头部位置保持和第一帧相同，并且仍然最小化踢水。
Initiates pull withright arm. Head position remains in same position as frame 1, and kick stillappears to be minimal.
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