[vdr] Re: Bad compression on Pro7

[Matthias Schniedermeyer <ms@citd.de>]

On Sat, Oct 12, 2002 at 02:01:05AM +0200, Daniel Schneider wrote:
> >It is 100% and totaly normal.
> >
> >Every 12 Frames (0.5 Seconds) is a Key frames. The 11 frames between
> >each Key-Frame are Delta-Frames. Too much changes/movement result in the
> >picture getting block-artefacts. It's a weakness in the system that
> >can't be resolved.(*)
> 
> That's not true at all. With a significant higher datarate you can 

(*)

> avoid almost all MPEG typical artefacts. Also better encoding can 
> help. You can see the proof for that on DVDs, there not much DVDs 
> with that bad artefacts you have on DVB. DVDs typically use datarates 
> around 7 MBit/s (up to approximately 10 MBit/s). The MPEG-2 encoding 
> for DVDs is also much better, mostly because there you can run 
> multiple pass encoding (which is hard to do with realtime encoding as 
> used for digital tv) and optimize complex scenes.
>
> Most private TV stations aren't interested in good video quality, 
> they want to squeeze as many channels on one transponder as possible. 
> 3sat and other "Öffentlich-Rechtliche Sender" have higher datarates 
> and better video quality.
> 
> Another possibility to improve digital tv quality would be HDTV. With 
> a resolution of 1920x1080 pixels as used in the USA you don't see 
> much MPEG-2 artefacts, because the 8x8/16x16 macro blocks are very 
> small. But European TV stations don't want to invest in new HDTV 
> equipment and in quality in general (of cause you can't have so many 
> HDTV channels on a satellite as DVB PAL crap stations with different 
> ads for each country...)




Bis denn

-- 
Real Programmers consider "what you see is what you get" to be just as 
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated, 
cryptic, powerful, unforgiving, dangerous.



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