[vdr] A new generation of DVB devices

Joerg Knitter joerg.knitter at gmx.de
Wed Oct 12 13:17:11 CEST 2005

Klaus Schmidinger schrieb:
> Several years ago, when VDR was first developed, it was based upon a
> then all new DVB card, which implemented a complete device with tuner,
> MPEG decoder and optional CI adapter.

I think the situation is different with the new display technology than
it was before with out 50/100 Hz TV PAL sets.

If you say that the new full featured hardware should implement DVI
output etc. - what will be responsible e.g. for things like scaling and

To be honest: If you look at latest (flat-)TV sets and their way to
deinterlace and scale the picture, I would prefer to get this done by
software e.g. by using spline resize algorithms (see e.g.
http://audio.rightmark.org/lukin/graphics/resampling.htm) and advanced
deinterlacing options (see e.g.
http://home.knuut.de/MWieser_/vf_raw_ntv_8) known from xine and mplayer.
Unfortunately, those algorithms need processing power, processing power
is expensive, and this will make this hardware really expensive.

In the end, the price will make the market again, and so we might get
lower quality as we really want, and a budget card with an apropriate
software solution will then be the better choice.

Don´t get me wrong, I like my FF, the quality I get on my 50 Hz TV and
the fact, that nothing (not even heaviest hard disc access) can
interrupt the decoding process. But I know: 50 Hz, real interlace
display and sharp image quality even on fastest movements will soon be
history - if it isn´t already. Maybe this will change in the near
future, but as I said, you will first pay a lot for it.

With kind regards


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