[FFmpeg-user] In and out-range Scale option able to correct 0-255 video to 0-235?

[Christoph Gerstbauer]

Am 19.05.15 um 23:06 schrieb Carl Eugen Hoyos:
> Christoph Gerstbauer <christoph.gerstbauer <at> gmail.com> writes:
>
>> C:\Windows\System32>ffmpeg -i
>> C:\Users\Administrator\Desktop\big_buck_bunny_ffvhuff.avi -vf
>> "scale=in_range=full:out_range=tv" -vcodec ffvhuff
> It seems to me that the scale filter is so smart
> that it doesn't scale if the input and output
> resolution and input and output colourspace
> are identical.
>
> Even worse, both the filter and the software
> scaler are smart enough to skip actual scaling,
> so fixing the issue in the scale filter is not
> sufficient...
>
> I am not 100% sure if this is a bug, but it
> seems so;-)
>
> (Please try to understand that I had no idea
> what you are talking about until seeing your
> - imo sensible - command line.)
>
> I hope you mean "to correct 0-255 to 16-235".
>
YES. thats what I want to do: correction to 16-235 levels.
I am checking different files with QCtools. It shows me optical if the 
values are above 235 or under 16. A numerical way would be much better, 
of course. But that is another issue.

Best Regards
Christoph