On 12/26/23 09:30, Devin Heitmueller wrote:
On Mon, Dec 25, 2023 at 4:04 AM Mark Filipak <markfilipak.i...@gmail.com>
wrote:
On 12/22/23 16:09, Devin Heitmueller wrote:
On Fri, Dec 22, 2023 at 3:57 PM Mark Filipak <markfilipak.i...@gmail.com>
wrote:
On 12/22/23 15:14, Devin Heitmueller wrote:
On Fri, Dec 22, 2023 at 2:38 PM Mark Filipak <
markfilipak.i...@gmail.com> wrote:
This page: https://ffmpeg.org/ffmpeg-utils.html
'says' this:
"The following abbreviations are recognized:
"‘sntsc’
" 640x480"
What is it? I'm not aware that any such thing exists.
It's NTSC with square pixels...
How do you go from 720x480 to 640x480 without throwing away 80 pixels
per line?
Normally, 720x480 decodes to 720x540.
-snip-
Even worse, you can have 720x480 video with a display aspect ratio of
16:9 (i.e. standard definition widescreen). In this case the pixel
aspect ratio is going to be 40:33.
Huh? "720x480 video with a display aspect ratio of 16:9" is what's on most
'NTSC' DVDs. The PAR is
32/27.
Oops. Sorry. SAR for 16:9 DVD is 32/27. PAR is 3/2.
You brought up 40/33. That's a PAR? A PAR for what?
And my original question: What is "sntsc"?
‘ntsc’ 720x480
‘pal’ 720x576
‘sntsc’ 640x480
‘spal’ 768x576
What ffmpeg is calling 'ntsc' & 'pal' are from film scanners targeting pseudo-NTSC DVDs and
pseudo-PAL DVDs.
What ffmpeg is calling 'sntsc' & 'spal' don't have any relationship to NTSC and PAL, neither film
nor broadcast, or to DVDs.
Why ffmpeg has put the letters 'ntsc' and 'pal' into 640x480 and 768x576 is a total mystery to me
and continues the confusion many people have.
I'm sorry I brought it up. It was the marketing people who labeled DVDs as 'NTSC' or 'PAL'. FFmpeg
is just propagating that myth. I simply ran across 'sntsc' and asked myself, "What is that?"
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