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Hi there and welcome
You need to ensure you remove HDCP when trying to record else it will not work as the devices will detect that its recording a protected system.
You will need a device that does this and you see this in the specifications such as
You can read more on this here
Click me to view
So as long as your splitter has the HDCP1.0/1.1/1.2 you will be ok.
One such device you can see here
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