[mythtv-users] Slight Distortion on Video

Matt Gibson diwelf at gmail.com
Mon Jan 8 16:00:02 UTC 2007


Thanks for the comments. I did manage to get all this working. What I
had to do was the following:

- go back to newest ATI drivers
- set "texturevideo" to on
- set the H size to 600
- set the V size to 800
- set overscan to 1
- turn off opengl overlay
- turn on xvid overlay

- compile mythtv from source, using the ATI_HACK (now I420 hack)

Then, once overscan was enabled, and texturevideo, I got perfect
video, though it was too large. After about an hour of messing around
with GUIX and GUIY and GUIOFFSETX and GUIOFFSETY i managed to get it
working perfectly :)

However, now mplayer is playing everything at 4:3 instead of 16:9 when
required, I'm sure this is something to do with mplayer using -vo xv
instead of -vo somethingelse, but I haven't had time to look into it


On 08/01/07, raphael <rpooser at gmail.com> wrote:
> Matt Gibson wrote:
> > Hi All,
> >
> > I'm using an ATI card for TV out. When watching tv, or videos, or
> > anything else, there's a small distortion on the screen.
> >
> > It's hard to explain, but basically around all outer edges of the
> > video being displayed, there's like a .1" black area, and sometimes if
> > there's lots of white on the screen, it pushes it into overscan, and I
> > don't see the blackness, othertimes I do see it.
> >
> > Basically it looks like it's a slight oval shape. I've tried overscan
> > and all that, but that j ust shifts the entire video.
> >
> You're just experiencing the same problem a lot of people are having
> with ATI TV out.  You have no ability to adjust the overscan or
> underscan.  It just outputs a ptcture of a given size, and cross your
> fingers that'll it'll fit on your TV.  With my older TV the output was
> perfect.  The image was centered and there were no black bars anywhere.
> When I hooked it to my girlfriend's TV, I saw the black bars which just
> drive me nuts.
> My solution was to use the VGA output hooked to a different TV.  Only my
> Nvidia card uses TV out now.
> Some other people on this list have found various ways to get around it,
> some people output the VGA to a box that then outputs all kinds of video
> options, including composite or svideo.  I've seen people make
> VGA-to-SCART connectors as well, which won't help if you're in America.
> Some other people have used the ATI DVI to Component adaptor they
> claim.  I couldn't get that thing to display a proper picture in linux.
> Raphael
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