[MPlayer-users] help wanted: using mencoder to make NTSC DVD from transport stream

Ville Saari 113762 at vs.iki.fi
Mon Mar 7 14:38:26 CET 2005

On Mon, Mar 07, 2005 at 01:10:36AM -0500, D Richard Felker III wrote:

> > For example if you scale=720:368,expand=720:480 then the black bars will
> > be (480-368)/2 = 56 pixels each. Not divisible by 16 although 368 is.
> Just don't use the same size for both! Duh.. ;)
> Make one 48 and the other 64.

Then we have an optimization problem: is uneven centering more or less
annoying than the slight quality loss from unaligned chroma blocks?

Remember I didn't say one should scale to x32, but only that it would
be even better if the resulting x16 size happened to be x32 too.

I wouldn't use uneven scaling anyway. I prefer cropping if I want to
align blocks. Not that I could see a few pixels of stretching in the
image, but just the knowledge that it is there disturbs me. This
stretch-phobia in me is probably caused by the people who prefer
watching 4/3 stuff on 16/9 TV:s in stretched mode and claim to see
nothing wrong in it.


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