[mythtv-users] Work around for the overscan A/V Sync, double buffering on XBox

[Aran Cox]

On Sat, 2004-04-03 at 05:45, Dennis Cartier wrote:
> Hello,
> 
> As Michael on the forums, discovered, you can get perfect video speed 
> and be able to adjust the overscan while using a Conextant based XBox.
> 
> The normal way of dealing with the overscan is to use xbv to set the 
> overscan, but this results in a hit to the fps of Myth. You can mitigate 
> this by then using xvattr to disable double buffering. Unfortunately 
> this causes tearing in the signal during fast motion on screen.
> 
> The way that Michael found, was to use xbv to set the vertical 
> resolution to 1 line greater than you are actually using.
> 
> Previous workaround:
> 
> xbv -auto 640 480 6.0 6.0
> xvattr -a XV_DOUBLE_BUFFER -v 0
> 
> New workaround:
> 
> xbv -auto 640 481 6.0 6.0
> #xvattr -a XV_DOUBLE_BUFFER -v 0
> 
> See the following for the original thread.
> http://bit.blkbk.com/phpBB2/viewtopic.php?t=37
> 
> This definitely works for Conextant based boxes for the 0.4 release and 
> likely the 0.3 as well. Not yet sure about FOCUS based XBoxes though.
> 
> Way to go Michael.
> 
> Dennis
> 

It seems to work very well for me on my old Xbox running 0.3.  I haven't
seen any slowdown in playback in MythTV or mplayer.  I've been ignoring
those black bands from the beginning and now they're gone! We'll see if
the wife even notices...