[FFmpeg-user] Order for Filters
nickrobbins at yahoo.com
Fri Apr 15 01:07:12 CEST 2016
> On Thursday, April 14, 2016 1:15 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> > 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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