→Gramps cannot import media with non-ASCII characters on filename
If Python returns a codec/UTF8 warning and this file was pasted from an external support (CD, HD, USB key), maybe filename has been corrupted ! It seems correct on screen but not on command line. Your OS was not able to properly set the encoding used on your external support.
The [http://en.wikipedia.org/wiki/Unicode_Specials#Replacement_character replacement character will be often a "�" (black diamond with a white question mark)
You can try to fix the filename by setting the correct character. Now you will be able to import this file into Gramps !