[mythtv-users] S-video & widescreen - both in and out

Ivor Hewitt ivor at ivor.org
Fri Apr 1 09:42:14 UTC 2005

David wrote:
> I don't think you can.
> from : 
> http://www.creativevideo.co.uk/pages/cvp_info_widescreen_explained.htm
> "It’s a common misconception that there are more pixels in a recorded 
> 16:9 SD image than a 4:3 one because in reality all PAL D:1 images are 
> actually 720x576 pixels, it’s just that a true 16:9 image is 
> anamorphically squeezed into 720x576 pixels…"
> So a TV signal (again, AFAIK) only contains 720x576 pixels.
> A widescreen TV signal has the same number of pixels but each pixel is a 
> different shape (in fact, for anamorphic, they're not even the same 
> shape as each other - I *think* anamorphic is not relevant here)
> So (again AFAIK) there's no point in messing about with resolutions - 
> the card will essentially scale to 720x576 anyway.
> This all changes for 16:9 projector (and probably 16:9 plasma/lcd 
> screens and HDTV) where there are a different number of pixels.
> My projector actually has 856x480 (square) pixels (the US is a big 
> market so I get stuck with NTSC height <sigh>) so in my case the 
> applications can just scale the video and it all looks fine!
> (This is just by way of giving you a decent argument to give to the wife 
> to buy a projector <grin>)
Same here. Actually I find I get a much higher video quality by 
outputting 720x576 and letting the Plasma do the scaling instead. It 
seems the scaling algorithms in my video chipset (VIA) aren't a match 
for JVC's!


More information about the mythtv-users mailing list