Hi, Paul,
>I'm not having a problem with the tools per se, but a
>problem with my DVD player. I need to fool it. Question
>below code.
...
>The problem is, my DVD player cuts off 10 or so pixels from
>each side, and 15 or so from the top and bottom. When I try
>to play the VCD it renders some of the subtitles off the
>screen -- not to mention some of the video.
>
>I imagine everyone's NTSC equipment does this to a certain
>extent, but the subtitles are the real problem.
Sounds like it's the TV that you need to fool (due to the usual
"overscan" which was recently discussed on this or the other
list). If so, my first (and joking) suggestion is:
o Buy a professional video monitor with an "underscan" button
that you can hit so that you see the entire frame in the
viewable portion of the CRT. (They do make such things.)
>The actual question:
> Is there some trick I can use to fool my DVD player into
> clipping less of my video; while still preserving the
> desired aspect ratio?
>
>I was shooting for thin black bars the whole way around, but
>it turns out yuvscaler won't do that.
I can't answer questions about yuvscaler, but I know that y4mscaler
can do this pretty easily:
y4mscaler -O preset=vcd -O active=300x200+0+0cc
The manpage explains all this (and more), but suffice it to say that
the "-O active=300x200+0+0cc" means "scale into an active region which
is a 300x200 rectangle, centered horizontally and vertically". The
exact size of this region will be adjusted so that all the right
aspect ratios are preserved. (And there are flags to specify how you
want such adjustment done.)
You may also need "-I ilace=top_only" or "-I ilace=bottom_only" if the
input stream is interlaced (since VCD's are progressive only, and
y4mscaler doesn't do real deinterlacing). You can also change the
color of the background if you don't like black....
-matt m.
NB: http://www.mir.com/DMG/Software/y4mscaler.html
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