[mythtv-users] Aspect ratio question

Matthias lists at thyroff.net
Sat Jun 1 10:19:34 UTC 2013


Am 30.05.2013 13:53, schrieb Michael T. Dean:
> On 05/30/2013 07:28 AM, Michael T. Dean wrote:
>> 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).
>
> Thinking about it, I'm guessing your statement, "I have to set the 
> aspect ratio in myth to 4:3 to get a correct display," is saying you 
> set "Video aspect override" to 4:3 to get it to display properly.  You 
> need to unset that and set "Monitor aspect ratio" properly, instead.  
> Note that you'll only see "Monitor aspect ratio" if Xinerama is 
> enabled in X when you start mythfrontend.
>
> Mike
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>
Dear Mike,

1000x thanks for the hint, I had never noticed that setting ( :-( )... 
fixed it!

Matthias



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