[mythtv-users] How I got great quality TV-out on my nVidia MX4000

[Neil Brideau]

This is a great post! Im looking forward to trying this. Thanks for 
sharing the knowledge.

Will Dormann wrote:

> I recently added an nVidia graphics card to my Asus Pundit, in hopes 
> of improving the TV-out quality.   The onboard SIS chip isn't bad, but 
> I figured I could do better.      After tweaking settings for quite a 
> bit, here's how I achieved what I believe to be the optimal output.   
> I have an SDTV connected to the card via S-Video, FWIW.   Some of 
> these settings may be redundant and/or unnecessary, but I'm just 
> relaying all the steps I've taken.
>
> 1) Install nVidia 6229 drivers
> 2) Recompile MythTV (0.16) with support for XvMC and OpenGL (via 
> settings.pro)
> 3) Modify your ~/.nvidia-settings-rc with the following values.  You 
> may need to run nvidia-settings once to create this file initially.
>
> 0/SyncToVBlank=1
> 0/TVOverScan[TV-0]=125
> 0/TVFlickerFilter[TV-0]=1
> 0/TVSaturation[TV-0]=156
> 0/XVideoOverlaySaturation=4250
> 0/XVideoOverlayContrast=4096
> 0/XVideoTextureSyncToVBlank=1
> 0/XVideoBlitterSyncToVBlank=1
>
> 4) Modify the XF86Config file with the following:
>
> Add to "Monitor" section:
> ModeLine "coryntscpi" 28.6 720 760 824 912 480 484 492 525 interlace
>
> Add to "Device" section:
>    Option     "NoLogo" "true"
>    Option     "HWCursor"     "true"
>    Option     "RenderAccel" "true"
>
> Add to "Screen" section:
>    DefaultDepth 24
>    Option "TVStandard" "NTSC-M"
>    Option "ConnectedMonitor" "TV"
>    Option "TVOutFormat" "SVIDEO"
>    Option "TVOverScan" "0.8"
> Add to "Display" subsection:
>    Modes "coryntscpi"
>
> 5) In the MythFrontend Setup screen for TV Playback, enable:
> - Deinterlace
>     - Mode: Bob (2x)
> - Use Video for Timebase
> - XvMC Playback
>
>
> That's it.   With these settings, I get great image quality, great 
> motion, and great smoothness (no jitter in scrollers across the bottom 
> of the screen, for example).    X CPU usage is between 1-2% during 
> playback.  I don't see any interlacing artifacts in high-motion 
> scenes.  The special modeline is required to get good resolution with 
> Bob Deinterlacing.   With the standard modeline and 640x480 
> resolution, I seem to lose about 1/2 of my vertical resolution when 
> enabling Bob Deinterlacing or XvMC.
>
> You can temporarily add " --verbose playback" to the mythfrontend 
> command line to troubleshoot your playback.   I see the following in 
> mine:
>
>
> ------ This means XvMC is working ------
> 2005-03-05 13:56:48 XvMCSurfaceTypes::find(w 720, h 1, c 1, i 2, m 
> 0,sw 0, sh 10
> 5, disp, p<= 105, 4800 <=p, port, surfNum)
> 2005-03-05 13:56:48 Trying XvMC port 105
> 2005-03-05 13:56:48 Found a suitable XvMC surface 0
> 2005-03-05 13:56:48 Using XV port 105
> ------ This means XvMC is working ------
>
>
> ------ This means Bob Deinterlacing is working ------
> 2005-03-05 13:56:48 XvMC will use bob deinterlacing
> 2005-03-05 13:56:48 Using deinterlace method bobdeint
> ------ This means Bob Deinterlacing is working ------
>
>
> ------ This means OpenGL Vsync + Video Timebase is working ------
> 2005-03-05 13:56:48 Using video as timebase
> 2005-03-05 13:56:48 Video timing method: SGI OpenGL
> ------ This means OpenGL Vsync + Video Timebase is working ------
>
>
>
>



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