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Radeon 9000 Pro - Poor DVD playback

Discussion in 'Desktop & Laptop Computers Forum' started by jbalat, Feb 23, 2003.

  1. jbalat

    jbalat
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    I have done a little research and seems that there is a problem with DVD playback on Radeon cards

    Does anyone want mine ???

    Check out the pictures here. The first is exactly what I get on my projector...
    http://www.theinquirer.net/?article=1462

    There is also another thread currently on the ATI news group
    named...

    ATI 8500 DVD Playback = GAMMA RAMP PROBLEM--DAMNING PROOF!!!!

    *********************************
    Attention all ATI 8500 users,
    *********************************

    February 22, 2003

    A few days ago, my good friend atibaby posted a message concerning the
    ATI 8500 video playback--that it had too much contrast and brightness
    is making the video look dirty, pixelated, etc.

    I've done some research (reading countless threads posted on
    www.rage3d.com and found that this is A REAL PROBLEM. It is called a
    Gamma Ramp problem specifically isolated to the ATI 8500 (as such even
    the ATI 7500 looks better for video playback).

    For over a year ATI knew and worked on this problem due to increasing
    complaints on AVS Forums.

    Heres a link with pictures taken (notice the blockyness in color
    gradations in the skyline above the mountains in the 8500 picture vs
    the GF3 picture (which has no blocky gradations at all):
    http://www.theinquirer.net/?article=1462

    Here's a message discussion regarding the broken gamma output:
    http://www.avsforum.com/avs-vb/showthread.php?s=&threadid=119340&highlight=radeon+8500

    This message posted on 1/26/2002 seems to indicate that ATI drivers
    finally fixed the Gamma Ramp problem:
    http://www.rage3d.com/board/showthread.php?threadid=33601168&highlight=8500+color

    HOWEVER, this message last posted on 5/6/2002 seems to suggest that an
    ATI drivers fix did not occur yet.
    http://www.avsforum.com/avs-vb/showthread.php?threadid=92584&perpage=20&pagenumber=4

    MORE SHOCKING, this message posted in late January 2003 (this year!)
    seems to suggest THIS GAMMA PROBLEM still exists:
    http://www.rage3d.com/board/showthread.php?threadid=33661093&highlight=8500+dvd

    YET EVEN MORE DISTURBING, this message posted also in January 2003
    suggests that the relatively new ATI 9700Pro may also suffer from
    "muddy" dvd playback like the ATI 8500:
    http://www.rage3d.com/board/showthread.php?threadid=33661468&highlight=8500+color

    MY PERSONAL EXAMINATION OF THE 8500 PLAYBACK:
    I did have a chance to look at the dvd playback of the ATI 8500 on a
    NEC LCD monitor using the Catalyst 2.5 drivers and they do indeed look
    really bad. Gamma is messed up. Shadows and outlines (of cartoons)
    contain lots of dark and visible pixelations. Sky and light scenes
    are overly bright--"posterization." You can't miss it.

    This occured using WMP, Powerdvd 4.0 XP, Windvd Platinum XP, with
    hardware acceleration On and Off ... indicating a hardware of driver
    issue (not a software dvdplayer issue).

    When compared to a Voodoo3 dvd playback (concurrently installed on the
    same system), the dvd playblack was smooth and beautiful (no dark
    pixelations, no bright skies)--Gamma was normal on a Voodoo3 card. It
    was beautiful on the V3.

    QUESTION: Why isn't this Gamma Ramp Problem discussed more in this ATI
    newsgroup?! It's widely discussed on the Rage3d forums and the
    AVSForums. Do people not care about DVD playback quality on this
    newsgroup? Are you just a bunch of gamers who only care about
    framerates?

    Even still, some of you must have noticed this problem (sure some of
    you watch dvds on your computer) but strangely even a deja.com search
    only shows 1 article on an Italian newsgroup that discusses this Gamma
    Ramp problem on the ATI 8500.

    After my own examination and finding the links above I find this
    situation ... xxxxxxx UNBELIEVABLE!
     

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