My DSLR camera has a mini HDMI out that you can use out of the box, doesn't require the camera to be in recording mode or such. It simply gives you the live vid

My DSLR camera has a mini HDMI out that you can use out of the box, doesn't require the camera to be in recording mode or such. It simply gives you the live video feed -- rather than having it write to SD card, having software on your computer decode the video & show the last frame there. The only option I think (it's been a while) I had to vaguely enable is to have it not show the normal camera UI over HDMI, but that was a simple setting. Having hardware emulate a SD card sounds like a niche product, if anything, whereas the only item I needed for my camera was a mini-HDMI to HDMI cable.