file .mp4 some problem

Hello,

I try to load this video in mp4 format from a site, but when I start watching, the screen remains black.

http://www.animeforce.org/DDL/ANIME/SwordArtOnline/SwordArtOnline_Ep_13_SUB_ITA.mp4

I do not know if it is the encoding of the video is not supported by videotag, or if there is some other reason.

could you give me a hand?

Here you will find the effect of problems:
http://astreamingita.altervista.org/site/?post_type=episodi&p=2105

thanks

http://wordpress.org/extend/plugins/my-videotag/