[vdr] Re: vdr2divx suggestions ? (poll)

[ma.hoff@t-online.de (Martin Hoffmann)]

[...]
> > > wrong, since 480x576 isn't a resolution in which videos appear on dvb.
> >
> > Huh ?
> > See RTL and Premiere for instance ! They all cast with 480x576 !
>
> For sure, but the picture can't be in that format. At least it must be 4:3
> and 480:576 is  ... strange for mpeg4. Maybe the stream is in that format,
> they have added some black borders or stretched the picture or ..don't
> know. Will do a research on that topic till tomorow evening , Ok ?
No !
they cast mpeg2 and mpeg2 (i guess all mpeg formats - even mpeg4) contain an 
aspect ratio field - so they cast 480x576 with an aspect ratio of 4:3 - 
telling the output device (DVBs card or stand alone receiver) - to scale the 
picture to 4:3 - in square pixels (like AVI does it) this would be 784x576 !
No black border magic - just stretching the image ! Beside that is how 16:9 
casts work - they have the full resolution if you have an 16:9 TV !

However, as said above, AVI cannot store aspect ratio info - AVI always have 
sqare pixels by default - thats why you have to scale to be avi compliant - 
however if you intend to view your avi on TV keeping the 480x576 and 
rescaling this at viewing time is okay !
Did anyone understand this ?

Martin


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