[vdr] deinterlacing and scaling for high-end progressive output on beamer

[Mirko Morschheuser <mirko@rogal-ingenieurgesellschaft.de>]

Hi all,

i currently use a micronic 1200S digital sat-receiver, a TV Set and an
Infocus LP350 DLP Projector. Inside the Infocus there is a "genesis"
deinterlacer/scaler Chip wich converts any interlaced signal on the fbas or
s-vhs connector to progressive scan 1024 X 768 for the build-in DLP Chip.
Lately i was experimenting with a DVB-S and VDR and now got a
Fujitsu-Siemens Activy 300 computer/set-top-box but haven't installed linux
yet.

As a projector user i am very interested in getting the best progressive
scan signal possible out of DVB Television. My question is the following.
Some channels start sending high-quality anamorphic 16:9 Signal like
Premiere Cinedom deluxe for example. As the source of a movie is mostly
filmcamera (cinema) 2 fields would exactly match to one frame and putting
together 2 matching fields to one frame schold not be too difficult.

Actually as i understand VDR only records the mpeg stream and replays it
through the hardware mpeg decoder chip on the DVB card. this chip outputs
interlaced signal on the fbas connector. would it be possible to make the
decoding/deinterlacing/scaling process more flexible? For example:

if you have a slow computer with a DVB card everything stays like it is now.
But in case you have a computer with enough horsepower and a graphics card
the mpeg data could be streamed to a software mpeg
decoder/deinterlacer/scaler module and be output on VGA or even DVI (my
projector is equipped with a DVI interface). That way one could prevent one
DA-AD conversion.

It would eventually be possible to implement the deinterlacing algorithm of
Dscaler wich is open source. www.dscaler.org

Actually i have no idea if a DVB-Stream includes the same flags as a DVD. In
case the flags are correctly set for filmsource there would be no problem to
deinterlace as 2 fields match together. But in case of tv source wich is
recorded with TV cameras (interlaced), the adaptive deinterlacing algorithm
of Dscaler would come in handy. If there are these flags, how are they
handled by VDR or the DVB driver?

As widely discussed in the Avsforum http://www.avsforum.com/avs-vb/ software
deinterlacing is most of the time of higher quality and more flexible than
main-stream deinterlacer chips as the genesis or SiliconImage Chips. To
bypass the chips inside projektors, Plasmascreens an rearprojectionsystems
would enhance picturequality.

here are some more infos of interlaced/progressive scan:

http://www.hometheaterhifi.com/volume_7_4/dvd-benchmark-part-5-progressive-1
0-2000.html

I know this is for most people a low-priority issue but i just wanted to ask
if there is any development into the direction of deinterlacing/scaling via
software. In my imagination a System wich receives, records, plays,
deinterlaces, scales
and outputs progressive scan signals on digital connectors like DVI (or RGB
via VGA for the CRT-Projectors) would be near to perfect.....and could
compete with >10.000$ video processors

 
cu
Mirko "Psychonaut" Morschheuser