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DM642采集PAL视频,奇偶场反



RT,最近在使用DM642做视频采集与显示,可是发现有的时候上电之后,采集的视频奇偶场是反的,出现的概率10次上电,至少有一次是反的。VP口的场判断是通过EAV判断的。改用外部控制信号之后还是会反。