[FFmpeg-user] Upscaling SD 4x3 to FullHD 16x9 - Aspect Ratio problem

[Cley Faye]

Le ven. 22 juin 2018 à 15:10, Christoph Gerstbauer <
christophgerstbauer at gmail.com> a écrit :

> >
> >
> > ​The "-s" option is incorrect in your case. From the documentation:
> > > As an output option, this inserts the scale video filter to the end of
> > the corresponding filtergraph. Please use the scale filter directly to
> > insert it at the beginning or some other place.​
> >
> > The scale video filter will take whatever ends up from your filter, and
> > scale it without respect to aspect ratio.
> > To do what you want, you probable have to use a complex filter, where you
> > create a secondary black source and paste the output of your current
> filter
> > into it using the "overlay" filter.
> >
>
> I understand
> So i need to generate (after the cropping and deinterlacing to 720x576 50p)
> a filter syntax (within the videofilter) which transforms the 720x576 4:3
> content to a pillarbox 1050x576 quare pixel video (with black bars at
> sides) -> and THIS one I can rescale to HD.
> Correct?
>
> if yes, has anyone more experience with that?
>

​Roughly. Look at the other answer; it basically does the pillarbox *after*
the initlal rescale, which is probably a better idea.​