Just gonna add another vote for VLC.
No. A lot? Yes. Everything? Definitely not.And another! VLC plays anything.
For the Thumbnails in Finder this Plugin works very well: https://github.com/Marginal/QLVideo/releases/tag/rel-173
Yeah, I changed all my file associations to VLC and use MPlayerX on things that VLC doesn't handle so well.
It's a real shame Perian isn't being developed anymore.
Agreed. I wonder why it's not?
Ah, but it is. Please follow the link from my earlier post.
There's development on GitHub with the most recent commit two days ago.