For making screen captures from videos, use free BS player:
1. Download BS player:
size : ~1024 KB .
2.Extract and run setup/online installer to install the program.
3. Open video file with BS player to make preview screenshots and on the right click find options 1 and 2:
4.Choose either option 1 if you would capture whole frame as a picture or option 2 if you would loved to get thumbnail preview as a picture like this:
5.upload file to imagebam.com and announce in Gassyerotica topic
IMPORTANT!
You can make screenshots with this program for almost 70% of video formats.
your picture will be saved in BS player installation folder by default
it's
C:/Program Files/Webteh/BSPlayer/bscapXXXX.jpg
under windows OS.