[mythtv-users] nVidia interlace problem
Alex Butcher
mythlist at assursys.co.uk
Thu Nov 13 16:33:38 UTC 2008
On Thu, 13 Nov 2008, Paul Gardiner wrote:
> Alex Butcher wrote:
>> On Thu, 13 Nov 2008, Paul Gardiner wrote:
>>
>>> I've seen some posts about problems with interlacing on nVidia
>>> cards, but I've been unable to pick up exactly what the problem
>>> is.
[...]
>> Output to Xvideo (e.g. MythTV playback) appears to have every other
>> scanline
>> doubled, so I need to use the linearblend deinterlacer in order to get
>> correct shapes (e.g. BBC Four logo is excessively aliased without
>> deinterlacing).
>
> Damn! Game over I guess. Don't understand the description quite: in what
> sense doubled?
OK, imagine the framebuffer contains:
*-*-*-*
-*-*-*-
****---
----***
Field 0 should be
*-*-*-*
****---
and field 1 should be
-*-*-*-
----***
Xv output appears to have both fields being identical (either field 0, or
field 1).
HTH,
Alex.
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