[mythtv-users] Resolution for PAL analgue TV

Craig Read craigread at csi.com
Mon Dec 13 00:51:58 UTC 2004


Phill Edwards wrote:

> 
>  
>
>>>I'm in Australia so I'm using PAL. I read that the recording dimensions
>>>      
>>>
>for
>  
>
>>>PAL should be 720 wide x 576 high, but when I do this I notice that it
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>>>
>uses
>  
>
>>>a lot more CPU (20% more) and the picture quality improvement is only
>>>marginal. Is 720 x 576 right?
>>>
>>>      
>>>
>>Yes, I believe that is the correct resolution for PAL.  Where exactly
>>are you setting this resolution - as you state below, X doesn't like
>>resolutions that aren't available on your video card.
>>    
>>
>
>In the mythtv ASettings -->T Vsettings --> Recording Profiles --> Software
>Encoders on the Image Size screen.
>
It sounds like that is where your cpu usage problem is.  I think the 
front-end will be trying to resize the output when it doesn't need 
resizing (because it's already at 720x576).  But what you've changed 
doesn't modify the resolution of your X output.  What I think you want 
to do is create an appropriate mode line in your /etc/X11/XF86Config-4 
file to output X at 720x576.

I tried doing this myself and found it much easier to just run at 
800x600.  As Rob said, it's fairly close and it works (with monitors and 
TV output).  I'd definitely try and get the native resolution of a HDTV 
working, but I don't think it will make much of a difference for a 
standard definition, direct view TV.

Craig...


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