[mythtv-users] Aspect ratio question

[Michael T. Dean]

On 05/30/2013 05:21 AM, Matthias wrote:
> Hello list,
>
> after connecting an hd projector as second display to my frontend, I 
> have aspect ratio problems. I hope, somebody here on the list can 
> point me to a solution.
>
> I am using a PC with an nvidia graphics card connected via DVI to a 
> 24" 1920x1080 monitor, everything works nicely.
>
> Then I connect an hd projector to the hdmi output of the graphics 
> card. I have configured xorg.conf with nvidia-settings to start this 
> configuration as cloned display, the DVI monitor 60Hz, the projector 
> 50Hz (I am in Europe), sync to the projector.
>
> In this configuration, all my 16:9 tv content will be displayed 
> letter-boxed with black bars on top and bottom of the screen, squeezed 
> vertically, on both screens. In the preview thumb in the watch 
> recorded screen, the aspect ratio is drawn correctly. (There are no 
> black bars in the menus, just when a video is played). Also mplayer 
> plays the recordings with the correct aspect ratio.
>
> I have to set the aspect ratio in myth to 4:3 to get a correct 
> display. If I do this in the video configuration settings, I will get 
> 4:3 programs streteched vertically, so this is not the solution I am 
> looking for.
>
> xdpyinfo shows the same information (1920x1080 pixels, 93x94dpi) in 
> both configurations, with and without the projector.
>
> Where do I have to look for a solution for this, has anybody 
> experienced the same thing?

When using Xinerama or any of its ilk (including Twinview), you must 
explicitly define the aspect ratio for MythTV to use.

Monitor aspect ratio
The aspect ratio of a Xinerama display cannot be queried from the 
display, so it must be specified.

in frontend settings under Appearance.  Are you saying you set that and 
it's wrong?  If so, it sounds like you may have enabled

Video aspect override
When enabled, these will override the aspect ratio specified by any 
broadcaster for all video streams.

which tells MythTV to ignore the display aspect ratio specified inside 
the video and to assume it's something else (and, really, should never 
be set by anyone).

Mike