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DM8168 QT叠加透明度问题

QT在PC平台上模拟出透明度叠加效果ok,但交叉编译到DM8168平台后只能看到GUI画面,透明部分背景是黑色,而不是采集后的图像,可能是什么原因,

有人用过默认HDMI输出能够看到透明度效果,但我的display播放通道是DVO2,不是默认的HDMI输出。