[MPlayer-dev-eng] text subtitle position (sub_pos)

[D Richard Felker III]

On Sun, Sep 15, 2002 at 10:32:04PM +0200, Felix Buenemann wrote:
> On Friday 13 September 2002 17:08, D Richard Felker III wrote:
> > Um no, reread what I said. On a television screen not all the pixels
> > actually fit, they run off the edges. So even if the subtitles are
> > within the image boundaries (of course they will be, that's obvious),
> > they may not be fully visible on the TV screen!
> Why not set up -monitoraspect to correct it for us? eg. -monitoraspect 4:3.1 
> or whatever is needed.

It's not that the aspect is incorrect, but that the whole image just
doesn't fit. On the other hand, if you shrink the image, you see black
borders in the middle of all four sides, since a TV screen is not
actually rectangular.

Further, NTSC only has about 224-236 visible scanlines per field, but
NTSC-resoluton movies are usually 320x240 or 352x240 (stupid
converted-from-VCD stuff). This means if you want the picture to fit
fully on the screen, you have to scale it down. Many backend scalers
don't support scaling down or have very very bad quality when scaling
down (G200).

Also, if you're making a VCD to be played on hardware VCD players, you
would have to put black borders on it to make the whole thing fit
inside the bounds of the actual TV screen. But this would be really
dumb -- VCD already looks horrid with the low bitrate required, and
the transition to black border would waste the few precious bits you
have, making it look even worse. Not to mention you'd be scaling down
the picture even more, which would lose detail...

Rich