[linux-dvb] Re: HDTV & DVB / VDR (dscaler ..)

[Patrick GUENEAU <pgueneau@wanadoo.fr>]

On TVSet non interlaced material is still displayed in interlaced mode.
The CRT has persistent phosphore (?) in such a way the eyes only see 1
frame where there are to fields (even and odd).

It is a problem with CRT projectors has the lines became apparent (two
thick) as soon as the screen is getting bigger, and due to refresh rate
you can't have the same persistency (?) and you have to
double/triple/quadruple the lines. That's why Faroudja and now Sage
products or Focus, Vigatec, Silicon Image solutions have been used in
high level/ expensive Home Theatre solutions.

Scalers answer most questions using specialised hardware/software
solutions :

- is it a video or film based material ?
- how eliminate scaling artefacts and jaggies (steps) on oblique lines
- what is the best deinterlacing solution at pixel level (stability on
background colors smooth rendition on movements)

DScaler can do that two (and their solution is really impressive) but
with a rather bad A/D solution (low cost BT8X8 cards).

the most recent HT oriented LCD/DLP projectors have good
deinterlacers/scalers built in (Silicon Image, Sage, Genesis etc.)
That the reason why many poople are saying now you'd better use
SVIDEO/YUV/RGB interlace output to feed your projector even for DVD
playback.

And that's the reason why i am working to integrate DXR3/H+ on my second
VDR setup to feed a future projector (LCD Sony 11HT or whatever DLP
projector with good built in scaler/deinterlacer)

If you have a projector not Home theater focused (as many DLPs are for
PowerPoint shows) you NEED externak scaling/deinterlacing.

When I watch recordings on my old Philips LC2000 projector using Video
composite output i find image quality rather good as good as my old LDs.


Sorry for being too long ; it's a real passion.

Patrick Gueneau.

Guido Fiala wrote:
> 
> On Thursday, 10. January 2002 16:59, you wrote:
> > Emil,
> >
> > Most of the time i am recording Films not Video.
> >
> > Using MPlayer it seems that there is ZigZag (bad deinterlacing) on some
> > films.
> > You can easily see it on fast moves.
> > But on good Canal+ broadcasts i don't have any problem.
> 
> Better force all broadcasters to a more useful transmission scheme than worry
> with such half-solutions at all :-(
> 
> For those watching on TVsets - the output of the DVBcard does the
> interlacing from non-interlaced material as well - or do you see
> negative-interlacing effects on non-interlaced material?
> 
> I wondered if there is some hardware in a TVset doing some kind of
> deinterlacing...
> 
> Speaking about hardware - why does'nt the ARM do that for us?
> 
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