FYI and FWIW,
I've been using VLC as my main Movie* player for several years [b/c it seems to work more reliably than any others I have, it offers better control of movies' audio tracks, and I like the control interface better], and very seldom encounter any movie files it can't/won't play.
Kb
* This includes 'commercial' DVD movies that I own or have rented as well as all sorts of videos I have downloaded from the 'net.
Addendum - I just remembered that I have, on 1 or 2 occasions over the years, installed a new version of VLC to find that it did something weird/unacceptable to me, and gone back to using the prior version. Currently using v0.8.6i