How to figure out video format by video sample?
If you want to identify video / audio file i recommend you to download K-Lite codec pack. It always works for me.

http://www.codecguide.com/changelogs_full.htm
"•Updated MediaInfo Lite to version 0.7.53"

MediaInfo - that's the one you can use, after installing it's just right clicking on the file or opening it and it should be recognized, via the tray icons (if not disabled) you can change various layout and information settings.