> <http://notredamedesneiges.over-blog.com> and download
> only flv and mp3 from other site which link exist on
> <http://notredamedesneiges.over-blog.com>

allow +*.flv +*.mp3
options -> link -> attempt to detect all=check
Mirror the site 
Note that most flv are embedded in a long parameter string to a swf. Httrack
may not be able to detect those and retreive them.