[vdr] Re: Image quality on sat reception.

[Luis Martinez Martinez <luimarma@iti.upv.es>]

I undestand what you say but when I use a comercial satellite tunner ( my sat 
provider tunner ) I find that the image is of much better quality (much more 
on the DVD side than on my tecnotrend side).
	Can it be a problem with the driver?
	Can it be a problem with my card?

Thanks,

Luis
El Mar 17 Dic 2002 11:21, escribió:
> On Tue, Dec 17, 2002 at 11:23:42AM +0100, Luis Martinez Martinez wrote:
> > Hi,
> >
> > I have been playing with my dvb card for over a week now, and even I have
> > been searching hard thru the lists and faqs, there is a topic about image
> > quality on sat reception that I have not find anywhere yet. I feel that
> > the image quality got from the tuner is far worse than that from a dvd
> > replay.
>
> I'm not surprised. A commercial DVD has 9 Gb of data to fit maybe a 90
> minute movie and perhaps an hour of extra footage in - so the bitrate
> can be astronomical leading to superb quality.
>
> Satellite transponders are VERY expensive, so the TV companies want to
> squeeze as many channels onto each multiplex as possible, meaning that
> 'smaller channels' will get a relatively small amount of bandwidth -
> I've seen some with as little as 4Mb/sec!
>
> This means if there's any fast movement / scene changes, you'll see MPEG
> macroblocking artefacts (little squares) all over the screen for a few
> frames until the next GOP appears :/
>
> Sad but true - digital television generally provides a lower quality of
> picture :/
>
> gdh

-- 
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Luis   Javier Martínez Martínez   Instituto Tecnológico de Informática
Linux User         #294788           System Administrator
			      Universidad  Politécnica de Valencia
Email: luimarma@iti.upv.es        Camino de Vera s/n    46071 Valencia
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