24fps Question

[MrAngles]

I just picked up a Panasonic TH-C50HD18 50" "720p) plasma and was surprised to find that it accepts a 1080p24 signal. This is the first digital monitor that I have connected to a blu-ray player, so maybe this is normal, but I thought that it would only accept 30 fps signals due to not being a "true" 1080p screen. Interestingly, on the FAQ for the display it states "What is the screen refresh rate?
60Hz" but also "Is this model capable of displaying a 24 fps signal? Yes, all the 2008 Plasmas will display 24 frames per second".

I haven't had a chance to mess with it yet, but if the refresh rate is set at 60 hz, doesn't that mean that it must be accepting a 24 fps signal but then applying it's own pulldown to it, in which case wouldn't it be better for the pulldown to be done in the player anyway? Thanks for any input anyone can provide.

[Josh Z]

Originally Posted by MrAngles

I haven't had a chance to mess with it yet, but if the refresh rate is set at 60 hz, doesn't that mean that it must be accepting a 24 fps signal but then applying it's own pulldown to it, in which case wouldn't it be better for the pulldown to be done in the player anyway?

I believe you're correct on both points.

[crazzeto]

I wouldn't expect any upgrade in PQ by going 24FPS.

[MrAngles]

Thanks for the help, I figured as much, just odd then that Panasonic states it "displays" 24 frames per second. In any case, does anyone know how the PS3's BD settings "auto" settings work? Any idea if I leave 1080p24 set to auto which setting it will use, or should I manually set it to 60hz? For that matter, should I be leaving all the BD settings on auto (such as RGB vs Y Pb / Cb Pr / Cr)?

[crazzeto]

Originally Posted by MrAngles

Thanks for the help, I figured as much, just odd then that Panasonic states it "displays" 24 frames per second. In any case, does anyone know how the PS3's BD settings "auto" settings work? Any idea if I leave 1080p24 set to auto which setting it will use, or should I manually set it to 60hz? For that matter, should I be leaving all the BD settings on auto (such as RGB vs Y Pb / Cb Pr / Cr)?

I'm guessing that auto mode should detect the "best" resolution + refresh rate, you can always test it out by throwing in a BD and pressing "display" on the TV remote to see what the incoming singnal is (at least that's how it works on my toshiba)....

I guess it is worth noting that "24fps" is really just a refreshrate that technically could be applied to any resolution... I just have no idea how a 720P TV is going to handle it.. maybe there'll be a difference, but I guess personally I just wouldn't expect it unless I saw it for my self.

[TheGreenDude]

Of course there'd be a difference... If the TV is running at a multiple of 24, i.e. 24, 48, 72, 96, 120 Hz, it can display the material at 24 FPS and you get judder free motion. It's not a resolution thing.

[crazzeto]

Are they going to bother implementing the proper pulldown on this TV? My guess is not likely considering the fact that it's not a "Premium" 1080P set... It's a value 720P set... But I am curiose to find out what the test results are.

[MrAngles]

Originally Posted by TheGreenDude

Of course there'd be a difference... If the TV is running at a multiple of 24, i.e. 24, 48, 72, 96, 120 Hz, it can display the material at 24 FPS and you get judder free motion. It's not a resolution thing.

That would be great, unfortunately there is no indication in writing that the display runs at anything other than 60 hz, and if all it does is 60 hz I highly doubt it would do a better job of 3:2 pulldown than the PS3. I'll check tonight to see what result I get when using auto mode, but my concern is that the PS3 will see that the tv accepts a 24 fps signal and automatically choose that, as it's the best option generally, which the tv will then pulldown to 60 hz.

The specific verbiage in the manual under the "Input signals that can be displayed" table is "The above signals are reformatted for optimal viewing on your display." This of course could simply be referring to scaling the images to the 1366x768 native resolution, but it also probably refers to the refresh rate as well. If it doesn't actually display 24fps though, I wonder what the point of accepting such an input would be...

[TheGreenDude]

Originally Posted by MrAngles

I wonder what the point of accepting such an input would be...

A bullet point on a features list.

[auricom]

Well if it says it can indeed display 24 fps then why should that not be the case, crazzeto? The image processing components in a lineup are usually/often the same throughout the different panel sizes and resolutions.

Try both ways MrAngles and let us know what you make of it. It'd be interesting.

[crazzeto]

They say they accept a 1080P@24FPS signal, it says nothing of processing the signal with the correct pulldown. To give you an idea there are many DLP RPTV's that actually are 1080P and claim to accept 1080P@24FPS signals but then apply a 2:3 pull down process to it... Thus negating any advantage. s

[LastSonOfKrypton]

Originally Posted by auricom

Well if it says it can indeed display 24 fps then why should that not be the case, crazzeto? The image processing components in a lineup are usually/often the same throughout the different panel sizes and resolutions.

Try both ways MrAngles and let us know what you make of it. It'd be interesting.

It says it can accept a 24fps signal, not display it

[MrAngles]

Originally Posted by LastSonOfKrypton

It says it can accept a 24fps signal, not display it

Well, it actually states on the FAQ

20.Is this model capable of displaying a 24 fps signal?
Yes, all the 2008 Plasmas will display 24 frames per second.

But the reason why I question the accuracy of that statement, or perhaps the interpretation of it is that the same faq also states:

13.What is the screen refresh rate?
60Hz

[auricom]

Originally Posted by crazzeto

They say they accept a 1080P@24FPS signal, it says nothing of processing the signal with the correct pulldown. To give you an idea there are many DLP RPTV's that actually are 1080P and claim to accept 1080P@24FPS signals but then apply a 2:3 pull down process to it... Thus negating any advantage. s

Originally Posted by MrAngles

... "Is this model capable of displaying a 24 fps signal? Yes, all the 2008 Plasmas will display 24 frames per second".

Anyway, have you seen any difference yourself MrAngles, trying both settings on the player?

[MrAngles]

I haven't had the chance to see it in action yet, and may not get to sit down with it and do extensive test viewing for a few days, but I'll definitely be checking out what input signal the tv appears to be accepting when I set the PS3 setting to auto tonight when I get home.