[mythtv-users] 16:9 video playback cutting off 10% on right side

[Brian Steele]

On 9/21/05, mythtv at varga.co.uk <mythtv at varga.co.uk> wrote:
>
>
> >>
> >> > System specs:
> >> >
> >> > Myth 0.18
> >> > Nvidia FX5200, 7667 drivers
> >> > 2x HD-3000 capture card
> >> > 800x600 through TV-out over s-video.
> >> >
> >> > I had my Myth system setup and everything was working great...until
> >> the fan on the video card went bad and the system started locking
> >> up.
> >> >
> >> > I was using a Nvidia 6200 AGP video card but I replaced it with a
> >> fanless FX5200 card. After I replaced the video card and rebooted,
> >> the Myth interface looked exactly the same as before, filling the
> >> screen with very little overscan. I then attempted to playback some
> >> recorded TV and discovered that on 16:9 material, at least 10-15% of
> >> the picture is missing on the right side. 4:3 material seems to work
> >> fine.
> >> >
> >> > This did not happen with the 6200 card. I didn't change any settings
> >> in .nvidia-settings-rc or in XF86Config-4, so I don't know what's
> >> causing this. Does anybody have any ideas?
> >>
> >> Different video cards sit the screen in slightly different places,
> >> it's just a fact of life. You'll need to tinker with the modeline in
> >> the XF86Config-4 file, just take it slowly.
>
> > I don't think that's the problem. The X desktop and the Myth UI both
> > look correct. Neither of them is getting 10-15% of the picture chopped
> > off on the right side. I only see the problem during 16:9 video
> > playback. I have Myth configured to use the same video mode for the GUI
> > and for playback, so it isn't that either.
>
> Are you definitely running your desktop in the same 16:9 mode?
> Do you have any other modelines defined?


I really appreciate the help.

My desktop is definitely running at 800x600. This is a 4:3 mode. There are
other modelines defined, but as I said before I didn't change anything in
XF86Config-4 when I switched video cards. I'll delete everything besides
800x600 to see if it makes a difference. The Myth UI is running full screen.

Let me try to clarify the problem.

Desktop resolution is 4:3, displaying on my TV via s-video.
I'm recording OTA HD.

4:3 shows that were broadcast with 16:9 aspect ratio display with grey bars
on the sides. Changing Myth to 16:9 Zoom aspect ratio makes it use the full
screen. This is the behavior I expect.

16:9 shows that used to take the full width of the screen with black bars at
the top and bottom now have 10-15% of the picture pushed off the right hand
side of the screen. Regardless of what aspect ratio I tell Myth to use for
display, some of the picture is always lost. 16:9 stretch seems to be the
closest to keeping all the picture. With my old video card, I could leave
the myth aspect ratio set to "default" and I wouldn't lose any picture.
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