On Wed, 28 Jun 2006, E.Chalaron wrote:
> I get my footage in XGA (1024*768) Mov (422 uncompressed using libquicktime).
>
> If I transform these mov in dv files such as :
>
> qttoy4m my_super8.mov | y4mscaler -O CHROMASS=420jpeg \
> | y4mtoppm | | ppm2raw -a -2 > my_super8.dv
> Well... it works despite no indications regarding the scaling, it cant be by
> default since the choice of NTSC or PAL needs to be asked somewhere..
It's being scaled.
ppm2raw -h
-n - images should be treated as NTSC
-a - scale image and maintain aspect ratio
The default is PAL and the '-a' says to scale.
> And results look much better then when I use a -O SIZE=PAL.
Better but "wrong"? What particular attribute is "better"? I have
a *very* difficult time believing that the scaling implemented by
ppm2raw is better than y4mscaler.
You weren't using both -a to ppm2raw _and_ trying to use -O size=PAL?
I think that would scramble things a bit.
ALso, if you're going to PALDV then somewhere you're going to want to
resample the chroma to 420_PALDV...
I think Matt would be *extremely* interested in y4mscaler doing a
poorer job of scaling than the naive (simplistic) scaling that
ppm2raw is doing.
Steven Schultz
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