[MPlayer-users] Re: [-] Re: [-] monitoraspect

Matthias Wieser mwieser at gmx.de
Mon May 30 13:55:30 CEST 2005

Am Freitag, 27. Mai 2005 20:49 schrieb Alexander Roalter:
> Vladimir Mosgalin wrote:
> > Hi Matthias Wieser!
> >
> >  On 2005.05.27 at 20:11:28 +0200, Matthias Wieser wrote next:
> >>>Therefore when using a 17" TFT one has to use a different
> >>>monitoraspect-Parameter than one using a 17" CRT.
> >>>Grabbing a ruler and
> >>>measuring up ones displaying device might help in all cases to
> >>>experience a distortion-free feature presentation.
> >>
> >>That's the reason for the option "DisplaySize" /etc/X11/XF86Config.
> >>Set Display size correctly and all programs but MPlayer will show
> >> videos distortion-free.
> >
> > Display size usually is correctly set already, X server queries it
> > from monitor on startup.
> > However, mplayer doesn't need it.. Just assuming that pixels are
> > square should be fine, and will work even if display size is set up
> > incorrectly. Now, people with non-square pixels probably really know
> > what they are doing and can set monitoraspect manually.
> The Point is that people using a CRT monitor with 1280x1024 px
> resolution aren't usually aware they're not having square pixels.

?? If someone does not select 1280x960 but 1280x1024 as screen resolution 
it should be clear that the pixels are not square. If 640x480 has the 
rigt aspect ratio then 1280x1024 (640*2x480*2+64) can not have the same 
aspect ratio.

> mplayer though assumes this and anamorphic PAL videos are shown e.g. at
> 1280x720 in height, which is not in the physical AR of 16:9, but
> something thinner, ~17:9, there are 60 pixels more to display in the
> black bars around it.

Most people with 4/3 17" or 19" CRTs either use 1152x864 or 1280x960.
Both resolutions are 4/3. If they do use a 5/4 resolution on their 4/3 
monitor then chances are good that the xserver knows the dimensions of 
the monitor. Users of 17", 19" TFTs do not have any problems at all.
People with 20", 21",... CRTs probably know (or their administrator knows) 
what they are doing (1600x1200 is very common).

> I don't think it would be a risky guess that only half of the people
> using this resolution are aware of this fact and thus don't have a
> -monitoraspect line in their configuration...

If they see that the video is too wide or too small maybe they will think 
about their X11 configuration??
Do you really think that all people with 5/4 CRTs, modern notbooks or 17" 
and 19" TFT displays should get wrong video aspect when using the default 
configuration of mplayer?

This will result in many unfavourable reviews of MPlayer.


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