On Thu, 21 Apr 2005, Nicolas wrote:
> I now use, following your advices:
>
> nice -19 lav2yuv record_01.avi | y4mshift -n -2 -b 12,8,744,560 |
> y4mscaler -I sar=1:1 -O sar=59:54 -O size=704x576 -S option=sinc:6 |
> yuvmedianfilter -T 3 | yuvdeinterlace -f | mpeg2enc -f 8 -V 500 -c -D
> 10 -E -10 -q 2 -K tmpgenc -o record_01_cvs.m2v
>
> I use the -f 8 flag with mpeg2enc, thanks to your advices!
You're welcome.
> picture. It seems to be ok for making a DVD, as you explained. However,
Yes, and the contraints for "set top box" (a DVD player) are quite
strict (only certain frame sizes, etc are allowed).
> displayed on a computer monitor. Therefore, I need the picture to have a
> 4/3 aspect, without any border.
Do not be surprised if you have to change your proceedure when you
make something that must play in a DVD player <grin>
> I'm working on it. But if you have any suggestion... ;-)
Of course - I have never been accused of not having suggestions <grin>
Since you have 1:1 pixels from the original capture you can do the
crop to select a 4/3 selection, resample and encode with "-f 3"
(GENERIC MPEG-2).
Something like this may work (but adjust it to your local
situation ;)). The output size was chosen to be a multiple of 16,
that is fairly important when encoding MPEG-2.
lav2yuv record_01.avi | y4mshift -n -2 | \
y4mscaler -I sar=1:1 -I active=744x560+12+8 -O sar=59:54 -O size=688x560 | \
mpeg2enc -f 3 -b 8000 -q 4 -V 224 -D 10 -E -10 -2 1 -o output.m2v
The scaling in this case is just resampling from 744 square pixels
to 688 59:54 pixels - the image will display (using MPlayer) as
746x560 (so there will be a 1 pixel black border - that's just how
the numbers work out). You can adjust the crop region slightly as
you wish - that selection does NOT have to be a multiple of 16.
Of course all of that will have to change when you want to produce
content for a DVD ;)
Cheers,
Steven Schultz
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