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floepie · (This post was last modified: 2012-12-16, 00:57 by floepie.)

Since upgrading from Windows 7 to 8, changing the video frame rate to match the source results in mild underscan of the entire image, including all "menu" overlay items. So, the image is expanded whereby the outer edges are lost beyond the edge of the screen and the video menu icons along the bottom are only partially displayed. Switching back to the normal 60 Hz restores the edges of the display. Running windows 7 and XBMC @ 24 fps worked just fine with the same hardware and 1080p display at both framerates.

Windows 8 with latest nVidia
XBMC Eden final

TeKo · 2012-12-18, 02:12

Proably using AMD gfx card?

Its not a Win8 problem its like that on W7 too.

You just have to open CCC or whatever the new AMD driver thing is called and set it to 24hz, then correct the overscan, save and change it back to 60hz.
When XBMC sets it to 24fps it should use your overscan settings.

floepie · (This post was last modified: 2012-12-18, 11:21 by floepie.)

Actually, using an nVidia card. And, on my machine, 24 fps second was working just fine under Windows 7 (verified by the 24 Hz showing at the display). After upgrade to Windows 8 (clean install), the same machine now shows overscan (or is it underscan?) where the whole image is expanded. After stopping a film, 60 Hz is restored on the display, and everything returns to normal.

Lister of Smeg · 2012-12-18, 15:03

Go into the Nvidia Forceware application.

Change your desktop refresh rate to 24hz.

Then you will see the overscan. Simply amend the overscan at 24Hz, then switch back to 60Hz.

This will sort your issue.

Also its worth noting that most TV's have a 'Fit to Screen' mode which corrects most scanning issues for you.

tutu · (This post was last modified: 2012-12-18, 17:36 by tutu.)

You should change it to 23Hz (which should give 23.976 Hz) the correct refresh rate.

24Hz is not 23.976Hz

Change your overscan settings then change back to 60Hz

I have a AMD card btw

Lister of Smeg · 2012-12-18, 18:18

(2012-12-18, 17:36)tutu Wrote: You should change it to 23Hz (which should give 23.976 Hz) the correct refresh rate.

24Hz is not 23.976Hz

Change your overscan settings then change back to 60Hz

I have a AMD card btw

On my AMD setup its definately 24hz that you have to set. But to be on the safe side, change the scan settings for both. Big Grin

StinDaWg · 2012-12-19, 10:29

(2012-12-18, 18:18)Lister of Smeg Wrote:
(2012-12-18, 17:36)tutu Wrote: You should change it to 23Hz (which should give 23.976 Hz) the correct refresh rate.

24Hz is not 23.976Hz

Change your overscan settings then change back to 60Hz

I have a AMD card btw

On my AMD setup its definately 24hz that you have to set. But to be on the safe side, change the scan settings for both.

No, I have AMD 5450 and 23hz gives 23.98. 24hz gives 24.

tutu · (This post was last modified: 2012-12-19, 14:54 by tutu.)

(2012-12-19, 10:29)StinDaWg Wrote: No, I have AMD 5450 and 23hz gives 23.98. 24hz gives 24.

23Hz will get you near 23.976 Hz (rounded to 23.98)
24Hz will give you 24Hz

99% of DVDs/Blu-Rays/downloads will be 23.976 fps.

If you set it to 23Hz your video will playback at 23.976 frames per second
If you set it to 24Hz your video will need to played back 24 frames per second, resulting in judder/frame drops, because it doesn't match the right frequency

Lister of Smeg · 2012-12-19, 18:42

(2012-12-19, 14:51)tutu Wrote:
(2012-12-19, 10:29)StinDaWg Wrote: No, I have AMD 5450 and 23hz gives 23.98. 24hz gives 24.

23Hz will get you near 23.976 Hz (rounded to 23.98)
24Hz will give you 24Hz

99% of DVDs/Blu-Rays/downloads will be 23.976 fps.

If you set it to 23Hz your video will playback at 23.976 frames per second
If you set it to 24Hz your video will need to played back 24 frames per second, resulting in judder/frame drops, because it doesn't match the right frequency

Based on your comment above, i have a new question. You make it sound like you can choose what refresh rate to use for files you are playing. But on my setup i just have 'adjust refresh rate to match video' selected, so XBMC chooses the refresh rate itself.

My blurays (mkv's etc) are 23.976 fps and they play at 24p on my TV. My assumption now is that 24p is actually 23hz based on your comments? Is this true or am i missing something?

Odon · 2012-12-19, 19:04

True, 24p is 23.976Hz (shown as 23Hz in Windows Display parameters)

tutu · (This post was last modified: 2012-12-20, 12:38 by tutu.)

(2012-12-19, 18:42)Lister of Smeg Wrote: Based on your comment above, i have a new question. You make it sound like you can choose what refresh rate to use for files you are playing. But on my setup i just have 'adjust refresh rate to match video' selected, so XBMC chooses the refresh rate itself.

My blurays (mkv's etc) are 23.976 fps and they play at 24p on my TV. My assumption now is that 24p is actually 23hz based on your comments? Is this true or am i missing something?

XBMC will switch to 23 Hz (which gives 23.976 Hz) when you use 'adjust refresh rate to match video'

But you need to adjust your refresh rate in Windows to 23 Hz first to adjust your overscan/underscan settings in nvidia or ATI control panel. It might not be required, it was for me. Then set it back to 60Hz afterwards.