[mythtv-users] Correct way to de-int NTSC on nVidia MX440?

[zoiks2004-ivtv at yahoo.com]

Thanks, I'll try it out with my Monster RF modulator. 
I'm suspicious, though, that such a difference in
image quality might be due to the S-Video input to the
TV.  I did manage to improve overall video quality
using "nvidia-settings".  (Of course, I checked all
the "sync to v-blanks".)

In any event, my main problem remains: syncing myth's
output to the TV so I can use bob deinterlace.  Has
anyone managed to do this with nVidia S-Video (SD)
output?


--- Jeff Roberts <jeffsmu at gmail.com> wrote:

> not sure how helpful my info is, but I've played
> with a variety of pci
> geforce cards with s-video out, with mostly the same
> results.  im
> pretty sure that one of them was an mx440.  the
> s-video looked like
> crap no matter what i did on any of them.  one day
> for fun i ran the
> s-video into an rf-modulator that was run into the
> tv, set to channel
> 4.  the picture looked so much better that i just
> left it that way,
> even though its sort of hokey.  dont know what the
> rf modulator does
> to the signal but it sure makes it look better.
> 
> On 2/23/06, zoiks2004-ivtv at yahoo.com
> <zoiks2004-ivtv at yahoo.com> wrote:
> > Bump.
> >
> > Is there really no one who knows how to get this
> > working?
> >
> > Alternatively, does anyone know that you *can't*
> get
> > this working correctly.
> >
> > Graphics card: MX440 nVidia-based with S-Video out
> > Myth: 0.18.1-fixes
> > Deint desired: Bob
> >
> >
> > --- zoiks2004-ivtv at yahoo.com wrote:
> >
> > > Is there a decent way to deinterlace NTSC with
> the
> > > S-Video output on an nVidia MX440?  I just can't
> > > seem
> > > to get it right.  I have a 37" Toshiba (non HD)
> TV,
> > > so
> > > artifacts from the interlacing are quite
> obvious.
> > >
> > > I've found that only the bob ('n weave)
> deinterlace
> > > truly deinterlaces properly.  (Though I think
> kernel
> > > deinterlace and linear blend may look a tad
> better
> > > than not deinterlacing.)  The problem is, bob
> > > deinterlacing doesn't maintain sync, so when I'm
> > > watching video, it will go in and out of
> jittering
> > > the
> > > image.  When it's in sync it looks great.
> > >
> > > I've tried to run nvtv on the box, but it always
> > > segfaults.  I eventually found in the
> documentation
> > > for nvtv that it won't work with MX440 video
> cards.
> > >
> > > Anyway, if anybody out there has managed to get
> good
> > > deinterlacing with the TV output from a MX440,
> I'd
> > > really like to know how it's done.  Is there
> some
> > > way
> > > to align the scanlines of the TV out to
> every-other
> > > line in the 640x480 screen, for example?
> > >
> > > FWIW, the modeline I'm using for video output
> is:
> > >
> > > ModeLine      "640x480" 25.20 640 664 760 800
> 480
> > > 491
> > > 493 525
> > >
> > > The monitor section looks like this:
> > > Section "Monitor"
> > >   DisplaySize  240 180  # mm
> > >   HorizSync 30-50
> > >   Identifier   "Monitor[0]"
> > >   ModelName    "M991"
> > > #  Option       "DPMS"
> > >   VendorName   "Toshiba"
> > >   VertRefresh  60
> > >   UseModes     "Modes[0]"
> > > EndSection
> > >
> > > And the "device" section looks like this:
> > > Section "Device"
> > >   BoardName    "GeForce4 MX440SE"
> > >   BusID        "1:0:0"
> > >   Driver       "nvidia"
> > >   Identifier   "Device[0]"
> > >   Screen       0
> > >   VendorName   "NVidia"
> > >   Option       "NvAGP" "1"
> > >   # Option       "NoLogo" "true"
> > >   Option       "HWCursor" "true"
> > >   Option       "RenderAccel" "true"
> > > EndSection
> > >
> > > While the module section looks like this:
> > > Section "Module"
> > >   Load         "glx"
> > >   Load         "type1"
> > >   Load         "extmod"
> > >   Load         "dbe"
> > >   Load         "freetype"
> > >   Load         "v4l"
> > > EndSection
> > >
> > > In the "Screen" section I have
> > > Section "Screen"
> > >   DefaultDepth 24
> > >
> > >   SubSection "Display"
> > >     Depth      24
> > >     Modes "640x480" "400x300" "320x240"
> > >     Viewport   0 0
> > >   EndSubSection
> > >
> > >   Device       "Device[0]"
> > >   Identifier   "Screen[0]"
> > >   Monitor      "Monitor[0]"
> > >
> > >   ##
> > >   Option       "TVStandard"  "NTSC-M"
> > >   Option       "ConnectedMonitor"  "TV"
> > >   Option       "TVOutFormat"  "SVIDEO"
> > >   Option       "TVOverScan"  "0.8"
> > >   ##
> > > EndSection
> > >
> > >
> > > Any help is greatly appreciated!
> > >
> > > Thanks!
> > >
> > >
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