How and where to make a video for the site (video in the header - video tag) and what dimensions should it have?

Question

HTML

Hello, I have a question about video for a site like skype .
The htmlbook has this advice:

<source src="video/duel.ogv" type='video/ogg; codecs="theora, vorbis"'>
   <source src="video/duel.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
   <source src="video/duel.webm" type='video/webm; codecs="vp8, vorbis"'>

That is, for full support, three formats are required, with certain codecs. It seems that with the formats it turned out to be done on Sony Vegas, but the codecs diverge. And the size of a one-minute video turned out to be 17 mb, which does not go anywhere.
So the question is, who makes such a video? What sizes are you using? What programs do you compress, cut, convert?

Answer 1

it seems like you can not write codecs,
now video / webm + video / mp4 is already quite enough