[vdr] Re: Interlacing

[Lucian Muresan <lucianm@users.sourceforge.net>]

Nicolas Huillard wrote:
> Tony Houghton a écrit :
...
> > sees it as a 25Hz or 50Hz mode, but I think it's the latter, in which
> > case I suppose it would have to provide the user with an option to force
> > it to sync to even or odd frames IYSWIM.
> >
> > Does anyone have any thoughts on this?
>
> I've been told DirectFB does a better job to provide sync signals to 
> software. First check Voodoo3 support in DirectFB, check if the drivers 
> provide sync interupts, then try xine over DirectFB, or softdevice.
I think the "official" DirectFB output in xine is currently still 
broken, but there is a working sample written by Claudio Ciccani, one of 
the DFB devs, in DirectFB-extra (CVS, also needs DirectFB cvs and pretty 
recent xine-lib I guess).

While talking about softdevice and DirectFB, last night I managed to get 
it working on my TV, by forcing the layer selection in the softdevice 
source code. Nicolas, I understood you are also dealing with 
softdevice/DFB for some time, I'd like to ask you few things:
If my graphic card's crtc2 layer (Matrox G400) says it supports changing 
of the field parity,  shouldn't that improve tearing artifacts on faster 
movements and for example, on gliding text in news tickers or movie 
credits? How does it behave on your hardware?
For now, I only managed to display both the video, and the OSD on the 
same layer. The Matrox G400 DH also has a sub-picture layer which could 
alpha-blend the OSD in hardware, but it doesn't work in the pixelformats 
offered by sofdevice. It only works with YUY2 for me, on the same layer 
with the video (therefore, a bit too CPU-intense). What is supposed to 
be transparent in the OSD anyway, just the gray area, or the yellow 
stuff in ST:TNG or the colored buttons, too? I can see the video only 
through the grey OSD background, and it looks good, I don't think it 
uses the dithering trick Stefan Lucke added lately on torgeir Veimo's 
suggestion.

Anyway, there are still some things that need to be improved with 
softdevice/DFB, but after what I've seen last night on TV, I like it!

Cheers,
Lucian