[mythtv] brightness contrast etc.

[Brent Hills]

With xvattr/xvinfo there are two groups of settings one for
"video-for-linux" ie the tuner card and one for my video card (ATI
Radeon).

When running mythtv with the default color settings xvinfo reports
outrageous values for the "video-for-linux" section (tuner card) (look
back at the current value in my previous email or here is a briefer
segment)

Shorter excerpt from xvattr:

Name: video4linux
 Port: 59
  Name: XV_BRIGHTNESS
   Flags: XvGettable XvSettable
   Min value: -1000
   Max value: 1000
   Current value: -1073744280

This makes me wonder whether the brightness and related calls used in
mythtv are working as expected (ie. the values reported are rational
when mythtv is not running)

Brent Hills



On Fri, 2003-03-21 at 12:01, Bruce Markey wrote:
> Brent Hills wrote:
> > Prior to Myth I used to control brightness and color etc. for the tuner
> > with xvattr and xvinfo.
> 
> The contrast controls and such are the v4l settings for
> the capture card, not the Xv display settings. This is
> so the card settings can be adjusted so that recordings
> will not have distortion.
> 
> For example, the default value for contrast is usually too
> high and causes white and near white to be out of proportion
> compared to medium colors causing a dingy look. Once a file
> is recorded like this, you can't really adjust the monitor
> to compensate. I've found that recordings don't look life-
> like unless the the v4l contrast is set to something below
> 40%. These controls are also on a per channel basis so you
> can compensate for one channel being brighter than another.
> 
> You should continue to xvattr if you believe you need to
> adjust the overall display when viewing.
> 
> --  bjm
> 
> 
> 
> 
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