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View Full Version : VDPAU and Crushed black levels



epi 1:10,000
October 13th, 2009, 02:49 AM
I' getting crushed black levels (maybe white too) on MY Panasonic TX-42PZ80U plasma w/ VDPAU Does anyone know haow to resolve this problem? is there an nvidia-xconfig argument for studio video (16-235) as opposed to pc (0-255)? Output is through HDMI on a 9800 GT.

Gen2ly
October 13th, 2009, 04:28 AM
Think this may be a bug in mplayer and HDMI.

http://wdtvforum.com/main/index.php?topic=261.10;wap2

I've read a couple posts that this can be fixed to a degree by adjusting the gamma but haven't tried.

zeronothing
October 13th, 2009, 04:39 AM
There is a PPA team that keeps up-to-date Nvidia drivers and mplayer packages that support vdpau. you might want to check out there page for more info. On there page they have there repositories available so you can download there packages.

there pages is here (https://launchpad.net/~nvidia-vdpau/+archive/ppa)

epi 1:10,000
October 13th, 2009, 09:42 PM
I turned on Panasonic x.v Color (what ever that is/ maybe it = xvYCC complience) and moved to a custom video setting w/ really high brightness but it still feels like something is a little off. I forgot to mention I'm using 180.60 drivers.

jyavenard
October 14th, 2009, 10:29 AM
I turned on Panasonic x.v Color (what ever that is/ maybe it = xvYCC complience) and moved to a custom video setting w/ really high brightness but it still feels like something is a little off. I forgot to mention I'm using 180.60 drivers.

VDPAU by default use PC levels for RGB (0-255), most TV use studio levels (16-235).

Feeding PC levels to a TV expecting sRGB will result in crushed blacks and whites.

I've added a patch to change the color levels to match your TV, as well as adding HDTV colorspace.

Few choices:
* Update to trunk >= SVN#22431
* Install that patch http://svn.mythtv.org/trac/ticket/7307
* Use my trunk daily repository, it has it compiled in (www.avenard.org/media)
* Wait for mythbuntu weekly build to update trunk (though my understanding is that they move to 0.22-fixes branch)

To use it, edit the video playback profile and add the following line for the "Custom Filters" entry:
studio,colorspace=0

epi 1:10,000
October 16th, 2009, 10:19 PM
Thank you for taking the time to make a patch! I'm hesitant to move to trunk cause I'll have to update my backend machine too. I'm not quite sure how to transition to trunk without loosing my current recordings/settings/vdpau (I need to research it a little more). I guess I could wait till November to upgade to 9.10 and .22