转载:http://blog.csdn.net/kickxxx/article/details/7755127三者都是V4L2定义的接口,英文原文参见 http://v4l2spec.bytesex.org/spec-single/v4l2.html#OVERLAYVideo Overlay: Video overlay devices have the ability to genlock (TV-)video into the (VGA-)video signal of a graphics card, or...【阅读全文】