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8168 hdmi输出只有声音没有视频

dm8168 rdk4.0,芯片自带的hdmi口输出720P@60到显示器正常,但输出到客户的hdmi编码器上,只有声音没有视频。客户的hdmi编码器,接笔记本720p@60音视频都正常。哪位遇到过这是什么原因呢?