I am receiving the warning below when using the HDMI Receiver Subsystem IP core.
Steps to reproduce this warning:
The above warning will then occur.
This is a known issue as the default interface type of VIDEO_OUT is AXI4-Stream(xilinx.com:interface:axis:1.0), which is not over-written as vid_io (xilinx.com:interface:vid_io:1.0) when the IP configuration is changed to Native interface.
The interface type is only updated after you reopen the project. However, the external port has already been set to axi4-stream based on the default interface type.
When the project is reopened, there is a mismatch between the IP (xilinx.com:interface:vid_io:1.0) and the external port (xilinx.com:interface:axis:1.0).
To work around this issue you can redo the step to make an external port connection after reopening the project.