[mythtv-users] YCbCr444 vs RGB and other questions

Andre mythtv-list at dinkum.org.uk
Fri Dec 3 19:48:31 UTC 2010

On 3 Dec 2010, at 19:07, Neil Salstrom wrote:

> Last night I had some time to sit down and play with my Frontend based
> on the Judder Free wiki page
> (http://www.mythtv.org/wiki/User_Manual:JudderFree) but in the process
> of this I delved in to some of the Nvidia settings and realized I had
> more options than I realized.
> My TV is a Toshiba 55SV670u (LED local dimming back-lit) and supports
> via HDMI 10 bit 4:4:4 and 12 bit 4:4:4.  I've been using RGB output
> via my 8400GS but as I was playing around I noticed a dropdown where I
> could select "Colorspace YCbCr444" with "Color Range Limited" as well
> as the normal "Colorspace RGB" and Colorspace as either "Limited" or
> "Full".
> With the Colorspace locked as Limited am I correct in assuming that is
> giving me 16-235 as opposed as 0-255 if I choose to use YCbCr444?
> Would I then stop using the vdpaustudio filter (but continue using
> vdpaucolorspace=auto)?
> I switched on the YCbCr444 and the picture got very dark and colors
> seemed a bit more vibrant.  I'll need to go back and set white / black
> levels again to correct the darkness.
> What's the best option?  RGB or YCbCr444?
> There was also a Nvida setting for Dithering.  Should Dithering be
> used or disabled?  I'd like the picture to be as natural as possible
> without added effects...
> Anyone play with these options or have opinions?

I started a thread about this just a few weeks ago, should be easy to find...

Depends on your TV which is best but YCbCr444 is the closest to the format as broadcast and gives the best results for me, the previous thread had some discussion about how to tell what your TV handles best.


> Thanks!
> Neil
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