如果摄像机带有s视频输出，你便无需适配器。
If the camera provide S video output, you will not need the adapter.
如果摄像机的像素颜色稳定性比较高，那么可以降低这个阈值。
Lower the threshold if your camera has a higher color-constancy per pixel.
在某一视图内检查摄像机路线，如果摄像机路径上有尖状，那么那一帧很可能有一些不牢固的跟踪器，或跟踪器不够。
Check the camera path in one of the viewports, if there is a spike in the path then there are probably loose trackers on that frame, or not enough trackers.
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