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. > > Is that what you calculated the PAR to be? Or is that what "ffmpeg -i" says when run against the VOB? DVDs in general are a pretty poor reference as to what constitutes "correct", given there are so many different authoring tools that were used and many of them were poor quality. That said, I haven't reviewed the underlying DVD specs, so perhaps they put in there some sort of clause where widescreen encodings should be 720x480 with explicitly no overscan region. Devin -- [image: Img] Devin Heitmueller, Senior Software Engineer *LTN Global Communications* *o*: +1 (301) 363-1001 *w*: https://ltnglobal.com *e*: devin.heitmuel...@ltnglobal.com [image: LTN Facebook icon] <https://www.facebook.com/LTNGlobal>[image: LTN X icon] <https://twitter.com/LTNGlobal>[image: LTN LinkedIn icon] <https://www.linkedin.com/company/ltnglobal/> _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
