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Discussion Starter · #1 ·
My HTPC is an Aopen MP-45DR equipped with an X4500MHD GPU. I have installed Windows 7 Ultimate on it. The newest driver for the GPU is installed. I have an old Sony 50" rear-pro LCD tv connected to it via DVI->HDMI (video+audio).


When viewing the "pluge" pattern on DVE i cannot see the blacker-than-black no matter how high i turn up the brightness on my TV. This is regardless of codec, program and video renderer used.


If i view a bitmap of the PLUGE pattern (such as http://avical.com/UserFiles/Image/PLUGE-LAPL.jpg ), i CAN see the blacker-than-black data with high brightness.


If i take a screenshot of the playback of the DVE PLUGE pattern, and dump it into paint then i can see that the background is RGB 1,0,1 or something like that, and one of the visible bars is around 10,10,10. I was expecting 16,16,16 for the black background.


I guess that means that somewhere the video is being expanded from 16-235 into 0-255 throwing away btb and wtw and screwing up my image?


Btw, if i use the intel GPU driver settings to override the video brightness then i can see the btb data, further supporting the above conclusion.


Question is: How do i stop this expansion of the video levels so that wtw and btb isnt lost?
 

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Quote:
Originally Posted by ziphnor /forum/post/17005545


My HTPC is an Aopen MP-45DR equipped with an X4500MHD GPU. I have installed Windows 7 Ultimate on it. The newest driver for the GPU is installed. I have an old Sony 50" rear-pro LCD tv connected to it via DVI->HDMI (video+audio).


When viewing the "pluge" pattern on DVE i cannot see the blacker-than-black no matter how high i turn up the brightness on my TV. This is regardless of codec, program and video renderer used.


If i view a bitmap of the PLUGE pattern (such as http://avical.com/UserFiles/Image/PLUGE-LAPL.jpg ), i CAN see the blacker-than-black data with high brightness.


If i take a screenshot of the playback of the DVE PLUGE pattern, and dump it into paint then i can see that the background is RGB 1,0,1 or something like that, and one of the visible bars is around 10,10,10. I was expecting 16,16,16 for the black background.


I guess that means that somewhere the video is being expanded from 16-235 into 0-255 throwing away btb and wtw and screwing up my image?


Btw, if i use the intel GPU driver settings to override the video brightness then i can see the btb data, further supporting the above conclusion.


Question is: How do i stop this expansion of the video levels so that wtw and btb isnt lost?

First i have the same tv and same graphics and OS. The intel win7 drivers are junk. Use the latest vista driver, especially if you want live tv, if you ue MCE.


Now onto your problem, Im not sure what you are doing, what is the source of the test pattern? MCE? calibration dvd?

In addition to MCE and drivers, the decoder if going to have an affect on the color. For instance if you use ffdshow, you can control the color, but if you are using the standard mpeg2 decoder yo may be limited to MCE settings...


Also have you turned off all the picture settings on the tv? for instance "movie" "vivid" etc?
 

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Discussion Starter · #3 ·

Quote:
Originally Posted by mike_311 /forum/post/17007014


First i have the same tv and same graphics and OS. The intel win7 drivers are junk. Use the latest vista driver, especially if you want live tv, if you ue MCE.

Thanks for the tip, unfortunately changing the drivers did not help, the behavior is the same.

Quote:
Now onto your problem, Im not sure what you are doing, what is the source of the test pattern? MCE? calibration dvd?

I have tried the following sources:

1. Digital Video Essentials DVD (calibration DVD) played back in Total Media Theatre, Mediaportal (ms codecs, EVR+VMR9 renderers), MPC-HC (internal codecs), Media Center and finally in VLC.

2. The MCE display calibration guide ( the video clip with the btb "X" in the background).

3. The AVSHD HDMV disc's test patterns with btb/wtw played back in Total Media Theatre.

4. THe AVSHD MP4 file played back in mediaportal using the Microsoft codec and the EVR renderer.

5. A JPEG of the PLUGE pattern (see my first post).


Only in number 5. can i see the btb and wtw stuff. In all other cases i can turn the brightness up on my TV to max/min without the btb or wtw showing.

Quote:
In addition to MCE and drivers, the decoder if going to have an affect on the color. For instance if you use ffdshow, you can control the color, but if you are using the standard mpeg2 decoder yo may be limited to MCE settings...

I have not tried ffdshow yet, i was hoping to avoid installing it, and it wont give me hardware accelerated playback. But maybe i should give it a try just to verify exactly what the problem is.

Quote:
Also have you turned off all the picture settings on the tv? for instance "movie" "vivid" etc?

Yes.
 

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Discussion Starter · #4 ·
Tried CoreAVC (for the h264 test patterns). It has some settings for how to handle 16-235 vs 0-255. Unfortunately, settings it to assume input video levels and trying both settings for output did not result in any change.
 
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