On Wed, 3 Dec 2003, Jonathan Bartlett wrote:
> I think I've figured it out, but if someone could verify my results, that
> would be great. I think I need to design at 1365x768. Using the
> information from the VCD stills page and other pages I found, I built a
> little aspect ratio converter that, given the number of pixels high and
> wide the destination platform is, and the display aspect ratio, it will
> calculate what width/height you should design at.
>
> If anyone wants to offer comments, that would be great, as dealing with
> the various aspect ratios has me tipping on the edge of insanity.
Aside from the number of pixels needing to be at least even (and a
multiple of 16 - neither of criteria 1365 meets ;)) you're going to
have a bunch of pixels hanging off the edge of the screen I think
since 1365's a lot larger than 1024
Are you sure the screen isn't one of the WXGA variety which has
a 16:9 physical size of 1280x768? I've seen monitors that have that
size.
With 4:3 physical dimensions the only way I know of to display a
16:9 movie is to letter box it. Generate the movie frames at
1024x576 and then composite that on a 1024x768 black frame (y4mscaler -
http://www.mir.com/DMG/Software/y4mscaler.html - can do the matte
operation for you - shouldn't be too hard to come up with the command
to do that). That will have a 16:9 image centered in a 1024x768
frame with 96 pixel black bars at top and bottom.
Encode as generic MPEG2 using -f 3 (NOT DVD's -f 8). It will probably
be necessary to specify "-V 224" and the bitrate ('-b') and a couple
other parameters (that's because the generic profiles do not have
the builtin defaults that DVD/VCD formats have).
Cheers,
Steven Schultz
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