Brightness change on playback

[Al'x]

When playing back mpeg-4 the brightness is changing for me sometimes.

I tried the same video on other computers with the same decoding setup (just normal divx) and it seems sometimes the brightness changes and sometimes it doesn't. I don't know what it depends on. It does not depend on player (all players I tried did the same thing).

Oddly enough, in Windows Media Player, the problem is fixed by turning off video acceleration.

Anybody know what is up? The problem doesn't seem so common (or people just don't notice) or I would have seen a topic about it.


Also: if I am encoding a video, should I turn the brightness up a bit to compromise between those who get the bug and those who do not? Or just encode as if nobody gets the bug?

[Zarxrax]

There are many different rendering modes that can be used to display video. The rendering mode that is used depends on your operating system, your media player, (some players like MPC allow you to manually choose the rendering mode), and maybe some other variables. Sadly enough, most rendering modes display inaccurate color and brightness.
A common rendering mode is the overlay mode. The overlay settings can normally be adjusted in your video card's settings. My nvidia card had some insanely stupid settings for the defaults that made the mode always look like shit.

You should examine the color of your video in virtualdub, as its probably the most accurate representation you will get. Don't try and compensate by adjusting the settings when you encode, because it wont look the same to everyone.

[Al'x]

That makes sense... I also have an nvidia. I'll play around with it.

Thanks! =)