I read that the ability to do 1080p/24 is touted as an advantage by some of the HD players, so which CRT projectors can accept such an output? Is the NEC XG135LC one of them?

A CRT projector would flicker like crazy while displaying an image with 24 frames per second. There is probably no CRT projector that will actually scan at 24Hz. A film projector runs at 24 frames per second but magically shows each frame twice so it's really like 48 FPS. What does the 1080p/24 format designation actually mean? 24Hz refresh rate or is it 24 different frames per second with each frame shown twice?

Scott

The best you can do is 48 hz even then that may not be an option if it flickers.
From what I have read (not experimented) the best option would be 1080i@72 via a processor with 8"LC nec.

Ok, so 72Hz is a good frequency. The advantage of the native 24p output is that there is no 3:2 pulldown needed.

I ran my 1271 at 48hz for a bit. Flicker looked exactly like it does in the theater... that's cool! I thought. I had a buddy come over and he's like, aaagh, flicker! I say, that's the same as in the theater, what gives? and he says, yeah, I can't stand it there either!

So, there you go. So much for "film-like" being the target... :p

Ok, so 72Hz is a good frequency. The advantage of the native 24p output is that there is no 3:2 pulldown needed.

True.
When you run 1080i@72 hz which is a multiple of 24 you will not do a 3:2 either. It is an option but I don't have any hands on.

48 is fine - 1080P/72 is usually too high for even the latest video processors which top out at 165Mhz.

If you do have a video processor you can output 60 from your source and the VP will take care of pull down for you.

Kind regards

Well this is exactly what I have - or about to have.......


For about a year now I have run an HD DVD XA1 this gives 1080i60 output.

I then turn that to 1080p60 into a barco 1209s.

(Analogue as it happens RGBHV)

Its a great picture but it does suffer a little bit from judder, if you look for it then you will see it, otherwise an excellent picture.

1080p24 has recently been available.

So I bought a Sony BDP S1 and this gives 1080p24 - OR DOES IT ???

What I found is that the "Main Movie" is in 1080p24 , but that the titles at the start are NOT. this "Direct" 1080p24 mode means the main film is now SILKY SMOOTH and left right pan shots as well as credits rolling are "perfect".

(By S1 is currently going back as it has an issue but once sorted Im gonna be very happy)

Now for HD DVD the XA1 wont give 1080p24 so im currently looking at going for an XA2, this will now give 1080p24 from the new firmware . AND a multi region hack that stays in place even after a new firmware update is also available (SD DVD).

So it looks like I should have 1080p24 from S1 and XA2.

The really good news is that my system WILL run 1080p72 and much much higher if I wanted.

When the S1 gets back I will be trying 1080p48 to see if that is Ok for me to view, Ive heard from others and it seems some people dont like to watch it.

Of course when players output 1080p24 for ALL the disc that will be even better.

My scaler has had new firmware so the change of different formats at the start of discs appears seamless, otherwise the scaler jumps about as the format changes.

Its amazing to think that analogue video paths are still way ahead of what digital can accept................

If you have a nice scaler all you need to have is 1080i@60 and the proces will do the rest.

I thought it was 2x 23.976 resulting in a 48hz signal.

If you have a nice scaler all you need to have is 1080i@60 and the proces will do the rest.

Will it do it perfectly ?

I feel it would do it better if it had less work to do, so 1080p24 is in reality the best starting point.

Will it do it perfectly ?

I feel it would do it better if it had less work to do, so 1080p24 is in reality the best starting point.
If it is encoded with 24 fps to begin with.

Well I have to assume we are talking about 1080p24 material as this was the original concept of this thread.

Of all my 200+ HD DVD's I have only found one so far recorded in 1080i.

1080i 96hz is good too, it reduces the field lines that can be noticable at 1080i 72hz on bright white bits. A solid high res image.

1080p 48hz flickers like crazy to my eyes - like a CRT monitor at 60hz. Unbearable. I don't like the cinemas for this reason either.

Everyone has to try 48hz for themselves.

Mark, I have actually tried 1080@24, and I have to admit it looked a lot better that theater image to me. The flicker was bad in any kind of a computer screen, but in the movie it didn't bother me (which is very strange since theater flicker does!). I'm going to try 1080@48 since my 808 will probably not do 72 without getting soft (even with 808S RBG amps). But 48 may be the golden point with HD film material.

Are you sure you got that right?

Most CRTs won't sync below 30hz.

And 24hz is way, WAY below the threshold of flicker.

Yeah, pretty sure. Like I said it flickers like hell (almost made me sick trying to dial in the convergence!) in anything but movies, but not in the movies. But I think I'm gonna go 48 instead.

You sure it didn't really display 48hz interlaced instead of 24p?

I'll check that tonight.

BG808 wont sync below 37Hz.

Some video card drivers (like Nvidia) show refresh rates differently (wrong) with interlaced resolutions.

1080i 60Hz driver show 30Hz
1080i 48Hz driver show 24Hz

Your monitor should show actual refresh rate, or you can also verify it from horizontal freq. that Barco show from text button.

:o:o:o:o 48 Hz... I thought it was 24 from what I saw in PowerStrip... Excuse me while I go on eBay and shop for a brain! :D

I once tried 1080 interlaced on my NEC 6PGx. I found that horizontal lines in the image would "waggle" up and down a little, so I remained with 720p fed to my pj (at 72Hz).I guess with interlaced the source timings need to be so exact that the lines of the two interlaced fields will fall in between each other, and this is probably not always the case...