Please, can you tell me how you succeeded on posting this mp4 video on DeviantArt ? I'm trying to do the same, but I can't get even one category which allows mp4 videos. They all tell "this type of deviation is not allowed".
well mp4 is a movie format, so it would make sense if you should add it to the film & animation category, right ? only problem is you have to be part of the movie community here on DA to be able to upload movies to that category.. here is some info on how to become a member of the movie community here on DA: help.deviantart.com/842/
the other way to do it is to convert your vid into a flash movie.. which then can be uploaded to the flash catergory