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请问各位，我想在osd0上用QT做一个界面，在VID1层显示视频，我该怎么设置OSD0为透明，网上有人说要在启动参数中设置启动OSD1，用OSD1来设置OSD0，还是在程序中设置OSD0？麻烦讲的具体一点，谢谢！
