After further investigation, i have found out that the information stated in my first post was incorrect (sorry about the confusion): After opening an mkv, vlc opens _all_ mkv's in the directory, just one thread per mkv. A directory with only 1 mkv opens only 1 thread. Would you know anything about ...
However, I tested Media Player Classic (with ffdshow) and this does not open an excessive number of threads for the x264 file. I really wish to play my files with VLC again, but the current situation makes that just impossible. Perhaps I could (or should) submit a bug report?
I put this in general because I don't believe it is limited to an OS and it is about a combination with samba. Here's the situation: I keep my files on a debian server, and share them to my windows PC with samba, where I play them with VLC. Because my samba shares/harddisks on the server are fairly ...