[FFmpeg-user] ffmpeg makes some sources darker

[Jim Worrall]

> On 2016 Jan 4, at 1:33 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> 
> How did you produce the screenshots?
ffmpeg -i in.mkv -vf fps=1/6 %03din.png
> 
> I do see that one of the png files you uploaded 
> is lighter but when I look at the 91st frame of 
> the file you uploaded, it is darker here with 
> MPlayer, vlc and FFplay (and when I transcode it).
> 
> Or to say it differently: How do you know it is 
> supposed to be lighter?
Sorry, I don’t quite understand.  The screenshots from
the source are brighter than those from the transcode.
That’s why I think the transcode should be brighter.

The video I uploaded is the source - the bright one -
so if it looks darker to you than the bright png, maybe
I’m doing something wrong.