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Discussion Starter · #1 ·
On my 8800GT card i can't get 23.976. Only 24 or something less then 23.976 when i choose "23" in nvidia setup.



My problem: at 24Hz, i feel some lack of smoothess (for exemple the credits at the end of a film are never totally smooth). (even using reclock)


So i'd like to know with wich card i will actually get 23.976Hz ?


I was thinking about the ATI 4550 or 4650. Do they deliver 23.976 ?


I've heard of problems between ATI cards and TMT. Is it still the case ?


thanks for your help.

Cyril
 

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my experience is to just get a new motherboard based on the nvidia 9300 or 9400 chipset.


I've tried ATI 2600 XT and Intel G35 chipset.
 

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I've just purchased a projector that supports 1080p24, and started noticing a frame-skip every ~25 seconds because of the 24/23.976 issue.


I cannot set my nVidia to 23.976hz, don't tell me that I have to replace my video card
 

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I have seen a post that with the current NVIDIA drivers you can set custom timings for a custom resolution to 23.976. The post was in ond of the AVS forums and included a n image of the custom timings form.
 

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My nVidia drivers have settings for 23Hz and 59Hz - which I've assumed are 23.98 and 59.94Hz options. Not had to do anything custom.


This is with my nVidia 9400-based HTPC connected through an Onkyo SR606 amp to a Sony 40W4000 TV. (Does what modes your TV's EDID says it supports possibly play a part in this?)
 

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Discussion Starter · #7 ·

Quote:
Originally Posted by sneals2000 /forum/post/15484342


My nVidia drivers have settings for 23Hz and 59Hz - which I've assumed are 23.98 and 59.94Hz options. Not had to do anything custom.


This is with my nVidia 9400-based HTPC connected through an Onkyo SR606 amp to a Sony 40W4000 TV. (Does what modes your TV's EDID says it supports possibly play a part in this?)

With "23" setting you get 23.966 an with "24" you get 24.001


you won't get 23.976 exactly :-(


I'm buying an ATI 4550 today !
 

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Sorry for my stupid question here! Why do you need a video card refresh exactly at 23.976 Hz?


I have played 24 FPS video (not bluray) on my LCD monitor (60 Hz) and Plasma TV (60 Hz), and did not notice any problem. Am I missing something here?
 

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Quote:
Originally Posted by cychou /forum/post/15493695


Sorry for my stupid question here! Why do you need a video card refresh exactly at 23.976 Hz?


I have played 24 FPS video (not bluray) on my LCD monitor (60 Hz) and Plasma TV (60 Hz), and did not notice any problem. Am I missing something here?

You obviously didn't miss anything if you didn't miss that extra frame every 25 sec.

Here: http://en.wikipedia.org/wiki/Telecine


2:3 pulldown

In the United States and other countries with television using 60Hz vertical scanning frequency, video is broadcast at 29.97 frame/s. For the film's motion to be accurately rendered on the video signal, a telecine must use a technique called the 2:3 pulldown (sometimes also called 3:2 pulldown) to convert from 24 to 29.97 frame/s.


The term pulldown comes from the mechanical process of pulling the film down to advance it from one frame to the next at a repetitive rate (nominally 24 frame/s). This is accomplished in two steps. The first step is to slow down the film motion by 1/1000. This speed change is unnoticeable to the viewer, and makes the film travel at 23.976 frame/s (or 7.2 seconds longer in a 2-hour movie).


The second step of the 2:3 pulldown is distributing cinema frames into video fields. At 23.976 frame/s, there are four frames of film for every five frames of 60Hz video:
 

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Quote:
Originally Posted by sapphire /forum/post/15493724


You obviously didn't miss anything if you didn't miss that extra frame every 25 sec.

So I will miss one frame for every 25 seconds (24 * 25 = 600 frames) if I play 24 fps film on 60Hz display?
 
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