romerojpg wrote:From what I understand its an odd thing, I thought my TV was future proofed, but its seems this magic 24 frames thing is the end thing to have which I just missed out on. I think most TV's try to "emulate" what signal they get (depending on the source I guess) and turn it somehow into 24 frames, even when its not, it creates a pulse on your screen sometimes apprently.
So 24 frames is apprently the best you can get, along with 1080p. But a lot of poeple say you either see your TV try to turn it into 24 FPS or you dont, some it bugs, some never see it, so the magic 24 frames may not be needed for most people
This seems only to be on HD dvds mind you.
Pretty much
all HD content is put onto the disc (BD and HD DVD) at 24 frames per second because that is how it was made for the cinema.
Most TVs operate at 50 or 60Hz, (effectively 50 or 60 frames per second) and the 24 frames of the HD feed need to fit into those 60 refreshes.
This is fine in the UK for things at 25 FPS (e.g. PAL DVDs) because the 25 frames are just shown twice each to fit into a 50Hz refresh rate. This means that 25 FPS content is smoothly played back.
The problem arises with 24 FPS sources such as BD & HD DVD. 24 FPS does not fit easily into 50 or 60Hz. A technique called 3:2 pulldown is used to get the frames to fit.
3:2 pulldown means that the first frame is shown 3 times, then the second frame twice, third frame 3 times, fourth frame twice, and so on. This means a 24 FPS signal can fit into a 60Hz refresh. The jitter problem is caused on panning shots whereby frames are repeated in an uneven manner.
This effect can be seen on NTSC DVDs as well as BD & HD DVD, so if you don't notice the jitter on your NTSC DVDs, you won't notice it on the HD formats either.
The only reason there's a lot of talk about it now is because our UK BD & HD DVD discs are from 24 FPS masters. It was either that or have 25 FPS transfers that have been sped up (just like PAL DVDs).
As for TVs supporting 24 FPS, as far as I'm aware, there are none that will play back at 24Hz. The few (and I mean very few) that will cope with a 24 FPS signal without 3:2 pulldown operate at 72Hz - each of the 24 frames is repeated 3 times to fit into the 72Hz signal.
I
think only the Pioneer high-end plasma screens feature 72Hz refresh & I don't know of any LCD screens that have that feature.
In short, I wouldn't worry about it - as long as your HDTV features a good 3:2 pulldown processor you shouldn't really notice the judder. Most people never notice it on NTSC DVDs, & its no different to that.
That explanation is probably as clear as mud to most people but its quite hard to explain without going into a lot of detail...