But if in that frame another spoke is in the 11:30 position, then it appears to be revolving backwards.
但如果那帧的另一条在11:30位置,那么它看起来就像往后转一样。
The next loop section controls setting pixels coordinates only if the frame at that position is greater than the start frame.
循环的下一部分控制像素坐标的设置,条件是当前时间帧在起始帧之后。
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