[mythtvnz] VDPAU package can be removed?

Mon May 11 02:40:15 BST 2009

I have a Sony Bravia V series TV.

You can turn off overscan.

In the TV settings, go to this menu:
Setup --< Screen Settings --< Display Area: choose "Full Pixel"

This turns off overscan.

David

------------------------------------------------------------------------
Dr. David J. Knowles  <dknowles at clearfield.com> Senior Systems Architect
Phone (+64 9)  358 2081                          Clearfield Software Ltd
Fax   (+64 9)  358 2083                    1st Floor 8-10 Whitaker Place
Mob   (+64 21) 75 9090                P O Box 3901 Auckland, New Zealand
------------------------------------------------------------------------

Aaron Drysdale wrote:
>
> >I get rather weird behaviour with my TV and component out. My TV is a 
> Sony Bravia KLV-40V300A.
> >
> >The TV seems to know the difference between a PC and a more typical 
> component like a DVD player.
> >
> >When I connect using VGA or DVI/HDMI it switches into PC mode. In this 
> mode everything looks the way you'd expect if you pluged >into a 
> standard LCD monitor.  A good chunk of the TV menu options are 
> disabled (Colour, Hue, Sharpness, etc...)
> >
> >When I connect using Component (or sometimes via DVI/HDMI if I've been 
> messing with nvidia-settings) it seems to switch to a standard >mode, 
> typically 720p, and in this mode the colours are dark and look 
> terrible. Overscan is enabled clipping the edges from the picture.
> >
> >I can only guess that a DVD player has a different colour profile from 
> a PC and the TV is trying to compensate. I suspect if I messed with 
> >the colour setting within nvidia-settings I could make it look right, 
> but that sounds a great deal like hard work.
> >
> >I did the above testing when I got the TV, so pre-VDPAU, probably 
> around ~173.
> >
> >Does anyone know if there is a flag I can pass to the video driver to 
> make it look right in this mode?
> >Does anyone else see similar issues with different brands/models of TV?
> >
> >None of the above really worries me as I don't use the component out, 
> but I'm still curious.
> >
> >Dylan
>
> I have done a LOT of reading and playing around with my system over 
> the weekend, and I believe that I now understand fully what is going 
> on, and also why you’re seeing the behavior you’ve described. Perhaps 
> well known by others, but hopefully educational for a few. BTW, I’ve 
> also got the KLV-40V300A TV. When I look back, I see a few people and 
> given me the solutions early on, I just didn’t recognize them for what 
> they were!
>
>  
>
> When I first created this thread, I was having 2 problems – judder, 
> particularly evident when watching ticker tapes on news programs, and 
> tearing during playback. I’ve now solved both of these, but have had 
> to make a compromise along the way.
>
>  
>
> First, this TV supports 1360x768 native resolution, at 60 Hz. At this 
> resolution, I get 1:1 pixel mapping, and absolutely perfect desktop 
> and GUI with no overscan.
>
>  
>
> The judder is caused by a mismatch between the broadcast refresh rate 
> (25 fps defined by PAL) and the screen refresh rate of 60 Hz. The 
> resulting 3:2 pulldown creates telecine judder.
>
> http://en.wikipedia.org/wiki/Telecine#Telecine_judder
>
>  
>
> The solution to this is to run the screen at 50Hz – no 3:2 pulldown, 
> and hence no judder. However, 1360x768 is a VESA format and VESA 
> doesn’t support refresh rates below 60Hz. I confirmed this by looking 
> at the EDID of this TV, and at least according to that 1360x768 50 Hz 
> is not a supported refresh rate. To get 50Hz refresh rate, I need to 
> run at 1280x720 (ie 720p). However (and here’s the compromise) if I do 
> that the TV has the smarts to think I’m now connecting a broadcast 
> device (STB, DVD Player, etc) and turns on overscan and “16-235” 
> studio levels.
>
>  
>
> Overscan is a common “feature” of most TVs. 
> (http://en.wikipedia.org/wiki/Overscan) High end, and newer DFPs, 
> often have a feature in their menus to turn overscan off. The Sony 
> Bravia V Series does not.
>
>  
>
> Colours don’t look natural. Broadcast video uses colour levels in the 
> range 16 – 235, while PCs use a colour range 0 – 255. So my graphics 
> card is sending out video as 0 – 255, however the TV has now switched 
> itself to “broadcast” mode and is interpreting the colours in the 
> range 16-255. Which means, the colours at the top and bottom end of 
> the range are all collapsed together. Darks and lights have lost a lot 
> of definition and contrast. Again, high end TVs often have the ability 
> to allow the user to switch colour modes – the Sony Bravia V Series 
> does not. (Although I did find that going into the TV menu Picture > 
> Advanced Settings > Colour Mode and changing to Wide did help a lot.) 
> The only way (I think) to fix this properly is to get the video driver 
> to scale the colour levels on output. This is something the Windows 
> nVidia driver allows you to do, and I found this post which suggests 
> the Linux driver developers will also support this in future.
>
> http://www.nvnews.net/vbulletin/showthread.php?t=130240
>
>  
>
> Of course, at 720p I also lose the 1:1 pixel mapping, and the TV 
> scales the resolution up to its native resolution. Which means that 
> the desktop and GUI don’t look as good, although I think video 
> playback looks better. Perhaps the TV’s hardware scaling is better 
> than software scaling?
>
> So all up, where am I now? I’m using HDMI 720p @ 50Hz, and get 
> overscan in the desktop, but the Mythtv GUI and video playback look 
> great after setting the appropriate scaling and X/Y Offsets in the 
> Mythtv Frontend settings menu. Since this is a dedicated Media PC, I’m 
> going to stick with this. Colours look slightly unnatural (although 
> improved after playing with the TV brightness and colours) but most 
> importantly the playback is very smooth. I’m waiting for nVidia to 
> provide a solution to the colours problem. Also, XBMC which I also use 
> supports switching refresh rates, so when playing back NTSC source 
> videos it automatically switches to 60Hz and I get smooth video there too.
>
>  
>
> I also eventually fixed the tearing problem. Disabled composite 
> according to JYA’s VDPAU FAQ. Interestingly it fixes the problem even 
> when I don’t have VDPAU enabled.
>
>  
>
> Of course, now I know that ultimately the best solution would be a new 
> TV, but you can imagine how that went down with the wife! Ideally, I 
> need a TV that supports 1920x1080 full HD with 1:1 pixel mapping; at 
> 24Hz, 50Hz and 60Hz refresh rates; the ability to switch on/off 
> overscan; and switch between PC Levels and Broadcast Levels.
>
>  
>
> I hope all this helps someone.
>
>  
>
> Aaron
>
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