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CMUX/DMUX not related with decoding in VS demo?

I've run the vs demo in 8168EVM board. My demo disabled CMUX/DMUX, but the display through HDMI(in VS board) can still show the video.

I'm confused .   As the figure shows, if we disable the CMUX/DMUX, the video decoding also cannot work and the decoded video cannot be displayed through HDMI(in VS board).  But the display do works and I'm quite sure CMUX is disabled as I cannot get data from HDD.