I've found the film thanks to this thread
The friend of my friend gave it to me and I watched it yesterday. Pretty amazing!
Very interesting, I didn't know most of those bands, there should be more such documentaries that show how metal music can be different, from how many different sources can take the inspiration and how it unites the fans from different cultures. And it's good to show some bands that aren't so much known worldwide, but their music may deserve to get to know better
And a fragment of Orphaned Land's live performance - greeeeat! I hope to be on such concert one day... ^^