Can't play video on FireFox and IE

Can't play video on FireFox and IE

I tried searching for a solution to this and within three days of browsing
the forum I could't find any help.
This is the link where I have my video:
http://www.aguacatesjbr.com/English/Company/company.html
I believe the code is correct because I replaced my source video with the
Oceans-Clip video provided by the site. The Oceas-Clip video CAN PLAY on
FireFox and IE but not my original video. However, if I type in directly
the address of my viedo it DOES render on FF and IE.
I don´t think it is size problem because I was testing it with a video
that weights 4.20MB.
I am having this problem with IE and FireFox in both PC and MAC. Android
and Apple devices work perfectly as well with Chrome and Safari.
Thanks for your help! This is really giving me a headache.