[mythtv] [mythtv-commits] Ticket #5594: starting mythfrontend for second screen gives black-video-screen

Michael T. Dean mtdean at thirdcontact.com
Sat Aug 2 13:47:24 UTC 2008

On 08/02/2008 05:48 AM, MythTV wrote:
> #5594: starting mythfrontend for second screen gives black-video-screen
>  Starting mythfrontend with:
>  # mythfrontend -display :0.1
>  _from_ display 0.0 gives the gui but only black video screen.
>  starting with:
>  # DISPLAY=:0.1 mythfrontend -display :0.1
>  works. Looks like the parameter -display will not be used for the xv-
>  screen.

That's a driver issue.  Nearly all Linux video drivers provide Xv 
implementations that work only on the first display.  There's nothing 
Myth can do about it.

See, for example, the NVIDIA README (and, I'm sure you'll find similar 
info in other drivers' READMEs).  
(the "Do video overlays work across both display devices" part).

If you want Myth to draw video on the other display, you'll have to use 
something other than Xv as your video renderer, such as xshm or (if 
necessary) xlib.  It's possible that OpenGL might work, but it's not 
really ready for primetime, yet.


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