Display some metadata about videos

[gdesmott]

• Source : whatever ;
• Durée : whatever ;
• Télécharger la video au format WebM (x Mo) ;
• Télécharger la video au format MP4 (x Mo) ;

[gdesmott]

I added those links but not the size yet.

[olethanh]

For the size it's easy if you use file field but since you access them directly via http, you will probably need to store the size in DB