On Tue, 16 Dec 2003, Matto Marjanovic wrote:
> >mpeg2dec -s -o pgmpipe input.mpg | pgmtoy4m -i t -a 15:11 | \
> > y4mscaler -S option=sinc:8 -O sar=20:11 -O size=352x480 | \
> > mpegenc -f 8 -E -8 -K tmpgenc -4 2 -2 1 -o output.m2v
>
> Yes, and the new "-O preset=CVD" will take care of all of that, i.e.:
>
> y4mscaler -S option=sinc:8 -O preset=CVD
Ah yes - that entered my mind just as I was hitting the send
command. Very useful preset.
> ps: mpeg2dec doesn't dump directly to a YUV4MPEG2 stream?
Alas, no it does not ;(
It's why I came up with the pgmtoy4m program. The YUV4MPEG output
from mpeg2enc was a local hack (I think Andrew did it eons ago to
an old version of mpeg2dec).
> That is unfortunate --- the chroma subsampling in pgmtoy4m is a simple
> linear kernel, and who knows what kind of chroma supersampling is used
Huh? All that pgmtoy4m does is unpack the data from "mpeg2dec -o
pgmpipe" and slap a YUV4MPEG2 header on it (and FRAME markers). No
conversion done at all.
What comes out of mpeg2enc is 4:2:0 (at the moment, 422 is on the
TODO list) but oddly packed (not planar). The data's read, unpacked
and output as 420p with header/frame added.
Cheers,
Steven Schultz
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