On Thursday 23 Jan 2003 5:32 pm, Bernhard Praschinger wrote:
> Hallo
>
> > I have read on german news-site (
> > http://www.heise.de/newsticker/data/vza-23.01.03-000/ ) about a tool what
> > is able to do fast mpeg2 transcoding with using the original motion
> > vectors. How can that be possible and if it is possible in what a range
> > could that be used
>
> I have also read that article. I lookes like that to does not really
> rencode anything. I have the bad feeling that they are only striping out
> data.
>
> > I can't believe that a transcoding of a whole dvd from dvd-9 to dvd-5 can
> > be done in 15-30 min.
> >
> > Any comments on this ?
This *is* possible. You simply increase the quantisation for each block
using the original motion vectors and motion compensation / DCT modes.
This would be monumentally faster than an encode from scratch.
The current work I am doing splitting mpeg2enc into a two seperate phases
(one motion estimation / compensation / DCT selection) another
DCT transform and bit-encoding would make it a lot easier to build
a transcoder of this kind.
Andrew
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