It is very helpful indeed! I didn't think MediaInfo and screenshots were possible with seedbox/rutorrent
I had to dowmload 3-4 full dvds (thank god not blu rays ) just to make screenshots
Thanks a whole lot.

Reading this great tutorial though, I have two questions-remarks.

1) Are you sure Screenshots can be taken from full blu rays also?
I have checked full dvds, mkvs and work fine. But not in full blu rays (I checked 3 of them).
I locate the m2ts files but Screenshots option is not active.

2) Not that important, and does not happen often, but sometimes we need to take screenshots from specific parts of the film, to include subtitled parts. To show how subtitles appear. So this may not be that easy, it's rather going to happen ...by accident.

Thanks again for this very helpful info.