We offer you a new program --
Multiplayer demo version
The program does not climb the registry.You only need to install the free VLC player.
Download LVC player with off site.
The program can play up to 4 files at the same time,allowing you to objectively compare 2-3-4 videos.
Frame-by-frame movement is separate for each file.
Stop-start General and separate.
Adjust brightness,contrast,gamma and so forth for each file separately.
The right mouse button can display one window.
And of course you can do full screenshots from each picture.