I'm using mplayer to view videos. When I try to change the brightness, I get a message: Video attribute 'brightness' is not supported by selected vo & vd. 0 0%

I have a Riva TNT2 Nvidia graphics card

This happened after I upgraded to slackware 10. I have edited the xorg.conf file to use "nv" driver.

When I use xgamma to change the brightness, it works. I have also downloaded the Nvidia drivers from their website. But when I use that driver, I can only change the brightness of the desktop, the video remains unaffected.

So, my question is:
How can I change the brightness in mplayer itself (not using xgamma but using the "3 & 4" keys)

I believe this is a feature of particular video-output drivers from within mplayer. If you go to Preferences, Video, within mplayer (from gmplayer, right-click on the video window) and choose a different video-out driver, it should work. I use "XV" with no problems.

I took me a while to get gmplayer up and running. (I just had mplayer earlier). I went to preferences and Video as u said. These are the options that I have :

1) XV
2) X11
3) gl2
4) xvidix

I can only use the first two, all others give errors, but I cannot adjust brightness with any of them.

Does adjusting xgamma helps? Like, type in a terminal:

xgamma -gamma 2

your screen will get brighter. Go ahead and run mplayer to see if it helps

Good luck!

Yes, Megaman X, I can use xgamma. But that becomes really inconvenient at times. If I want to change the brightness when I'm watching a movie, then I have to pause it, and open a terminal, and then use xgamma. I want to set brightness using mplayer itself. I could do this earlier, in Slack 9.1.

anyone find a solution to this? xgamma is inconvienient, to say the least.

Probably your only option is us a video filter option like here:

mplayer -vf eq=60:50 movie.wmv

using -vf eq=60:50
sets my brightness ratio 60:100 and contrast ratio 50:100... Play with the diff percentages until you get what you like... It's not on the fly but better the xgamma...

KC

On some configuration(for example, via vnc) is usefully to use eq2