[pedrocr]

>24fps video on a 30hz display isn't going to be smooth. Every fourth frame of the video will last for twice as long as the rest.

I see what you mean. Doesn't the HDMI standard have a way to fix this? It could just have a mode where you have 30 frames per second sent to the screen with the indication of which 60hz or even 120hz timeslot to use them in. It might need a little more/faster memory in the screen but should work fine.

[dmm]

That sounds like what Nvidia's G-Sync does. A in-monitor computer buffers frames and displays them at a rate specified by the computer.

http://www.anandtech.com/show/7436/nvidias-gsync-attempting-...

[pedrocr]

It sounds like it indeed. Although that particular implementation won't go below 30hz so wouldn't fix this particular case.

[wmf]

In that case you can display movies at 48 Hz.