GNOME Bugzilla – Bug 541037
Cannot edit WMV files
Last modified: 2008-10-06 11:57:58 UTC
WMV files are really common those days, so I'd expect Pitivi to deal with those files. Especially as other GStreamer applications like Totem seem to support WMV files.
It can edit wmv, it's just that you don't have the gstreamer plugins required for wmv playback on your system.