.play() to different htlm element / extern video formats

Do you mean sort of like a lightbox? You would need to define multiple “sources” in your player set up for webm/mp4.

Yes like a lightbox.

I can′t finde an option for multiple sources.
I got the free Version – is this a Pro Option?

Multiple sources can be done like this in our WP plugin:

[jwplayer sources=”{ file:’something.mp4′ },{ file:’something.webm’ }”]

There is a lightbox here, but this is for the standalone JW Player, not specifically for use with the WP plugin – https://github.com/emaxsaun/jwbox, demo – https://www.pluginsbyethan.com/github/jwbox.html