[popcornmix]

OK, thanks a lot in advance

Here it is: https://www.dropbox.com/s/cws7xi0rzmiggk...e.mkv?dl=0

Okay, I get a corrupt video with this file (on a Pi2), so it's not your Pi2 that's at fault.
I don't really understand why the Pi1 is working - perhaps it's just a timing thing, or uninitialised memory that the Pi1 gets lucky on.

Anyway - I'll add it to the list of files for our codec expert to look into.