[mythtv-users] Aspect ratio problems

papenfuss at juneau.me.vt.edu papenfuss at juneau.me.vt.edu
Wed Feb 25 16:21:23 EST 2004


	I did that... that's the 4:3, 16:9, etc that I cycled through.  The
point is the TV *isn't* widescreen... it's 4:3 but mythtv thinks it needs to be
16:9 before it'll fill the screen.  I will try the DisplaySize option in the
XF86Config tonight.

-Cory

On Wed, 25 Feb 2004, Sean D. wrote:

> While watching TV in myth did you press "W" to goto widescreen mode?
> it took me forever to figure that out after i got a widescreen TV... i was screwing
> with X for hours...
> 
> papenfuss at juneau.me.vt.edu wrote:
> 
>  Hello all.  I've got a bit of an issue that I can't make sense of.  How 
> does mythtv decide to do its aspect-ratio scaling?  Here are the details:
> 
> mythtv-0.14 compiled from source
> PVR-250r1, OEM as #0 card
> BT878-based #1 card
> Rage128 VGA card to custom hardware converting to SVideo 
> 	(no scanline conversion)
> Resolution is 720x480, 15.7 kHz Horiz, 29.97 Hz Vert, interlaced
> GATOS r128 driver, since the stock XFree86 r128 driver appears to have a bug 
> 	with Xv on interlaced modelines.
> 
> 	Mythtv seems puts black bars on both sides of the TV (and squishes the 
> picture), unless I cycle through the aspect ratios until 16:9 is selected.  
> It looks like it's only using around 640x480 or so of the horizontal 
> resolution.  To get around doing this all the time, I can set the PVR-250 to 
> set the aspect-ratio of its recording at 16:9.  The BTTV-based card has no 
> such option.
> 
> 	I normally capture at 480x480, but changing the capture resolution  
> doesn't seem to affect anything.  Also, I've played with over/underscan.  It 
> will "overscan" in the underscanned window is all.  I'm actually suspect that 
> mythtv is cropping the top of the picture when I cycle through to 16:9, since 
> I'm running 1.5 AR on the screen, not the 1.78 of 16:9.
> 
> 	The other problem is now that I'm archiving some shows via SVCD, 
> the mpeg stream from the PVR-250 is tagged as 16:9, confusing my DVD player 
> into squashing it.
> 
> 	So, the big question is where's the error?  Is it mythtv trying to
> auto-detect/assume aspect ratios?  Granted, computer monitor resolutions are
> *almost* always 4:3 ratio (except, for example, the weirdo 1280x1024).  Given 
> that we're doing TV here, assuming square pixels on a 4:3 screen doesn't seem 
> like a good assumption.  Perhaps adding a user-definable aspect ratio from 
> within the GUI setup?
> 
> Thanks,
> -nothing_is_ever_easy_Cory
> 
>   
> 
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> 
> 

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