[mythtv-users] Nvidia DPI 1080x540

Chris Ribe chrisribe at gmail.com
Mon Oct 29 01:51:12 UTC 2007


On 10/28/07, George Mari <george_mythusers at mari1938.org> wrote:
>
> Chris Ribe wrote:
> > On 10/28/07, Chris Ribe <chrisribe at gmail.com> wrote:
> >> Hello all,
> >>       I am struggling to get my frontend to play video correctly on my
> new
> >> TV.   It is a 1080i RPTV that I have working with a custom 1080x540
> >> modeline.   When I playback recording or watch live TV, I get
> horizontally
> >> squished video, as if myth believes there are square pixels.
> >>
> >> I am running last weeks SVN, the most recent Nvidia drivers with a
> 7200GS
> >> graphics card, and I have followed the instructions in several howtos
> on the
> >> wiki, which have lead me to this xorg.conf  (edited to remove
> irrelevant
> >> information):
> >>
> >>
> >> Section "Device"
> >>         Identifier      "7200GS"
> >>         Driver          "nvidia"
> >>         BusID           "PCI:2:0:0"
> >>         Option  "NoBandWidthTest"       "true"
> >>        Option  "UseEdidDpi"    "false"
> >>        Option  "UseEDID"       "false"
> >>        Option  "UseEdidFreqs"  "false"
> >> Option  "ModeValidation"        "DFP-0: NoEdidModes,NoMaxPClkCheck,
> >> NoVesaModes,
> >>  AllowInterlacedModes,NoDFPNativeResolutionCheck, NoHorizSyncCheck,
> >> NoVertRefres
> >> hCheck"
> >>         Option   "ExactModeTimingsDVI"   "true"
> >>         Option          "UseFBDev"              "false"
> >> EndSection
> >>
> >>
> >> Section "Monitor"
> >>         Identifier      "51S500"
> >>         Option          "DPMS"
> >>         DisplaySize     243.84 137.16
> >>         HorizSync 15-46
> >>         VertRefresh 59-61
> >>        Modeline "720hitachi" 79.5 1920 2088 2142 2412 540 572 576 592
> >> -hsync -vs
> >> ync
> >> EndSection
> >>
> >>
> >> From my understanding, the combination of the "UseEdidDpi"  "false"
> tag,
> >> the DisplaySize tag, and the resolution should lead the drive to
> compute a
> >> non-square DPI and video should display correctly.   Unfortunately,
> this
> >> isn't happening.
> >>
> >> Any suggestions would be greatly appreciated.
> >
> >
> > So, I was just googling things like "xorg" "DPI"  and "non square
> pixels,"
> > and one search returned my original message from the archives as it's
> 2nd
> > result.  That was disheartening.
> >
> > Anyhow,  it caused me to reread my own message and discover that I said
> > 1080x540 when I meant 1920x540.
> >
> > So, 1920x540 is the resolution I'm working at, 100,50 is the DPI I'm
> looking
> > for.
> >
>
> I'm not an expert on non square pixels, but when you say the video is
> horizontally squished, does the image not extend all the way to the left
> and right edges of your display?
>
> Are your recordings in 4:3 aspect or 16:9?



4:3 recordings are displayed at a 2:3 aspect ratio.  It is a 16:9 display
that myth is treating like a 32:9 display because the resolution is set to
1920x540.





-- 
TV/IT Engineer
WCJB-TV Gainesville, FL
(352) 416 0648
cribe at wcjb.com
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