Imported filenames sometimes have added garbage to their names on Windows x64

[itsmattkc]

No description provided.

[itsmattkc]

Source name detection appears to be broken on Linux too. Some filenames are consistently cutoff too early. This may or may not be related to the issue on Windows (which is far more random and inconsistent, even when importing the same file over and over). It doesn't seem to affect the filename as Olive/FFmpeg can still access the file, it only appears to affect the "nickname" given to the source in the source list.

[itsmattkc]

Still some interesting nickname generation issues, seemingly memory-related problems.