[FFmpeg-user] Order for Filters
nisar.med at gmail.com
Fri Apr 15 04:54:20 CEST 2016
I think the bars on the left and right is called Pillarbox and it happens
when trying to maintain AR of a PAL/NTSC on widescreen.
On Fri, Apr 15, 2016 at 9:07 AM, Nicholas Robbins <
nickrobbins-at-yahoo.com at ffmpeg.org> wrote:
> > On Thursday, April 14, 2016 1:15 PM, Carl Eugen Hoyos <cehoyos at ag.or.at>
> > > Nicholas Robbins writes:
> >> > But if the input is letterboxed, you should definitely crop
> >> > first.
> >> The input definitely appears to be letterboxed. Is there some
> >> difference between "appearing" to be letterboxed and actually
> >> being letterboxed that I should check for?
> > Please remember that I live in PAL country and my mother tongue
> > is not English: Does "letterboxed" mean black bars either left
> > and right or above and below the actual image?
> > If yes, what is the difference between "apparent black bars"
> > and "actual black bars"?
> > I think we can agree that the black bars do not help fieldmatch
> > but take time to process and should therefore be removed as
> > early in the process as possible.
> > Carl Eugen
> "letterboxed" means black bars top and bottom. I didn't know if there
> might be a difference or not. Maybe there is a way to encode the black bars
> in the mpeg video stream besides just black pixels. I didn't know. Seems
> like its just black pixels.
> I thought before would be better, but wanted to make sure that the crop
> wouldn't mess us the fieldmatch, like a scale would for instance.
> Thanks for your advice.
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