that not the info we need.
we need the exact version of xbmc (builddate).
does it only affect this file or does it happen on all file.
only on video or even if you play some mp3s or view some pictures.
the type of video you try to play (audio/video codecs, use a tool called gspot to get these infos)
the media your file is stored on (xbox hd, cd/dvd <iso or udf>, network share <smb/samba/xns/xbms>).
and what else could be important (like do you load a subtitle file with the video ....).
well you don't have to provide all infos. but the more you can give the better the chance someone will help it or fix it.
everthing else will not get much attention by the users/devs.
thanks