[vdr] Re: vdr2divx suggestions ? (poll)

["Rene Bartsch" <vdr@bartschnet.de>]

----- Original Message -----
From: "Martin Hoffmann" <ma.hoff@t-online.de>
To: <vdr@linuxtv.org>
Sent: Wednesday, October 30, 2002 11:32 PM
Subject: [vdr] Re: vdr2divx suggestions ? (poll)


>
> [...]
> > > > 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 ?

Yes, but it would be fine to check the aspect-ratio in the MPEG-PES-stream
and rescale when encoding.

Rene



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