[mythtv-users] Driving Australian TVs

[Damon Searle]

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of Ben de Luca
> Sent: Sunday, 2 January 2005 10:45 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Driving Australian TVs
> 
> 
> On 02/01/2005, at 10:29 PM, Rob Hillis wrote:
> 
> > Ben de Luca wrote:
> >
> >> Im using a 800x600 display out the back of nvidia card, its a gf2mx.
> >> Connected to my tv with s-video.
> >> using opengl sync with the bob de interlacer. I have set the xv
> >> colour from blue to black. The osd shivers abit but apart from that
> >> people have asked how I made my tv so sharp compared to there set top
> >> boxes.
> >
> > You shouldn't need to be using any de-interlacing when connecting to
> > your TV via SVIDEO since your TV is *expecting* an interlaced signal.
> > Deinterlacing should only be used on displays not using an interlaced
> > format - i.e. LCD screens and plasmas not in an interlaced mode, CRT
> > monitors and the like.
> >
> Indeed but it still looks better.
> 

It certainly does look better with bob turned on, if you don't use it you
get a slightly jerky 25fps video with combing artefacts. If the video output
from mythtv and the tv-out somehow synced up to produce a correct interlaced
signal that the tv is expecting then it might come out smooth on a tv, but I
don't know if that's even possible. With the bob deinterlacer turned on you
get a smooth 50fps video, but with lower resolution (which doesn't usually
matter unless you zoom in on 4:3 content).

So in relation to the original post the usual solution is to use the bob
deinterlacer, combining it with a 50hz modeline cant hurt either, eg
Modeline "720x576x50" 26.80 720 752 848 880 576 588 593 605
Most people do this with nvidia cards, but it might work with a savage.