Most fansub groups (and, I, myself, a fansubber) in the industry recommend cccp[/B]-project.net/]Combined Community Codec Pack (CCCP) because it is a complete, fully-functional codec pack and media player that renders fansubs, especially in .mkv format correctly and efficiently.
VLC use thier own codec pack thats why many fansubs in .mkv (a.k.a. softsub) formar will have the typesetting such as fonts & on-screen translations (e.g. signs) appear incorrectly. -_-#
I highly recommend the use of CCCP for all media-playing! :v: