23.98Hz and 29.97Hz in ATI CCC? - AVS Forum
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post #1 of 9 Old 05-27-2009, 02:51 PM - Thread Starter
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After playing around with the settings on my ATI Radeon 3870X2, I noticed you can change the frequency to 23Hz (which is probably 23.976Hz) and 24Hz in the ATI CCC. This does help the juddering when playing video with the same frequencies, but what about the following frequencies?

23.98Hz
29.97Hz

I'm asking this since I have a number of video files which are are encoded with these frequencies. Whenever I play them in 23Hz or 24Hz, juddering occurs. Is there a way to change the frequency to 23.98Hz or 29.97Hz?

Thanks in advance.
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post #2 of 9 Old 05-27-2009, 03:19 PM
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What make/model of display/TV are you playing them on? I ask since not all displays/TVs can display 24fps content without judder? If You live in a country with 50Hz power what refresh rate is your display/TV set to refresh at?
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post #3 of 9 Old 05-27-2009, 03:41 PM - Thread Starter
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Quote:
Originally Posted by walford View Post

What make/model of display/TV are you playing them on? I ask since not all displays/TVs can display 24fps content without judder? If You live in a country with 50Hz power what refresh rate is your display/TV set to refresh at?

Here's my current setup:

ATI Radeon 3870X2 graphics card -> ASUS Xonar HDAV1.3 audio card (with latest firmware) -> Yamaha RX-V663 AV-receiver -> Sony KDL-40W4500 HDTV (European version)

Everything is connected with HDMI cables.

I'm sure all these devices can handle 24fps content. Right now I have no problem with regular 24fps or 23.276fps content. It's those other two frequencies (23.98fps and 29.97fps) which makes the video judder.
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post #4 of 9 Old 05-27-2009, 04:47 PM
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Haopefully Sneals2000 will join in here and help. He is in the UK and can much better explain the problems you are having and possible solutions. I suggest you update your AVS profile to show what country you live in.
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post #5 of 9 Old 05-28-2009, 02:52 PM - Thread Starter
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Anyone have a solution for this?
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post #6 of 9 Old 05-28-2009, 03:26 PM
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Movies are normally stored at 23,976Hz. A very limited number have been mastered in 24,000Hz but they are certainly quite rare. Thats it.

Movier reported as 23,98 is propbably youre "reading" program rounding it off(from 23,976). Movies reported as 29,97 is after reverse telcine effctively made into its 23,976Hz original.

Judder with ATI has more to do with drivers. Nvidia can get it right but not ATI. Their 23 setting in CCC constantly deviates (23,974-23,977) during playback, resulting in occasional judders here and there.

Set it at 24 (which for some reson does not deviate, rock solid at 24,001 in my case) and get reclock. Otherwise buy nvidia.
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post #7 of 9 Old 05-28-2009, 05:38 PM - Thread Starter
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Quote:
Originally Posted by bonzichrille View Post

Movies are normally stored at 23,976Hz. A very limited number have been mastered in 24,000Hz but they are certainly quite rare. Thats it.

Movier reported as 23,98 is propbably youre "reading" program rounding it off(from 23,976). Movies reported as 29,97 is after reverse telcine effctively made into its 23,976Hz original.

Judder with ATI has more to do with drivers. Nvidia can get it right but not ATI. Their 23 setting in CCC constantly deviates (23,974-23,977) during playback, resulting in occasional judders here and there.

Set it at 24 (which for some reson does not deviate, rock solid at 24,001 in my case) and get reclock. Otherwise buy nvidia.

Actually, According to ReClock, my refresh rate stays stable at 23.975Hz at both 23Hz and 24Hz modes What's going on?

BTW, ReClock doesn't really help here (still some judder now and them), but maybe I'm doing something wrong with the settings...?
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post #8 of 9 Old 05-28-2009, 05:52 PM
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Do you have the refresh rate of your display set to 48HZ or is it defaulting to 50Hz?
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post #9 of 9 Old 05-28-2009, 06:16 PM - Thread Starter
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Quote:
Originally Posted by walford View Post

Do you have the refresh rate of your display set to 48HZ or is it defauing to 50Hz?

When the refresh rate is set to 23Hz (which, according to ReClock is a stable refresh rate of 23.975Hz) I get some juddering at certain times. The same thing applies when the refresh rate is set to 24Hz, which is weird. Even ReClock tells me that the refresh rate is exactly the same (23.975Hz). Why make me choose then if there's no difference?

When watching 23.976fps content at these frequencies, I get some juddering at certain times (this gets a bit worse with 23.98fps content I have). And when changing the refresh rate to 59Hz or 60Hz, juddering becomes a lot worse.

29.97fps content looks better on 59Hz though (which seems to be a stable refresh rate of 59.861Hz), but still, some judder occurs. This is also the case when the refresh rate is set to 60Hz (which, according to ReClock, seems to fluctuate between 59Hz and 60Hz ).

I really see no real difference when using ReClock. The results are the same if I would only change the refresh rate. The only difference is that it takes a bit longer to load the video files.
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