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How to lower dm8168 dvrrdk 4.0 display link time delay

Hi all:

I use dm8618 dvrrdk4.0.

In my application i capture 1080P 60 Hz video and output use display link,

Only capture link and display link used, and the time delay is about 60 ms,

ISRFlag i have set true already.

and i see the log, the min/max display link is 50/75,

i want to know why display cost so much time,

is there lots of functions in hdvpss which i do not need opened?

And how can i lower the display time delay for my application.