That's probably the easiest, when combined with a HDCP stripper if necessary.
It's unlikely to be high video quality though, as all of the similar HDMI capture devices that I have (~7, known as the "Can'tLink" devices as a play on "CamLink") will only do decent framerate at reasonable resolutions in MJPEG.
Quick Edit: Also, if you get one, check there's a tiny heatsink on the chip inside otherwise they cook themselves.
It's unlikely to be high video quality though, as all of the similar HDMI capture devices that I have (~7, known as the "Can'tLink" devices as a play on "CamLink") will only do decent framerate at reasonable resolutions in MJPEG.
Quick Edit: Also, if you get one, check there's a tiny heatsink on the chip inside otherwise they cook themselves.