[MPlayer-users] Playing QHD (3840x2160) material with mplayer

Dean S. Messing deanm at sharplabs.com
Thu Apr 17 00:49:35 CEST 2008

Reimar Döffinger wrote:
> On Fri, Apr 11, 2008 at 01:54:04PM -0700, Dean S. Messing wrote:
> > (1920x1080) uncompressed RGB at 60fps using the x11 driver.  The two
> > CPUs sit at about 40%.  Interestingly, using the xv driver, the usage
> > is quite a bit higher.
> That is no surprise, xv (at least when using the default port) does not
> support RGB (though I am surprised it works at all, my nVidia card can
> only do at most a resolution of 2046 x 2046 with xv).

You may have mis-understood me. The xv vs. x11 experiement I did above
was for HD video (smaller than 2046x2046), not QHD.
Indeed, trying to use xv with QHD gets:

   Source image dimensions are too high: 3840x2160 (maximum is 2046x2046)

What do mean by the "default port"?

Regarding your comment about xv not supporting RGB, I've noticed
in the past, when I've used xv on HD video, that tiny colour
artifacts can be introduced on very high quality material.  I take
it that xv is converting to a subsampled "colour difference" space?

> I would strongly suggest using YV12 as video format, this halves the
> vide bitrate (though you also halve the resolution of the colour
> information of the video - given how the human eye works that should not
> really be relevant).

I would love to try this, but won't I get the above "dimensions" error
from xv?


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