If it uses he android client there should be a setting to choose which player, at least with mobilie there is.

On the client go to settings -> client settings -> video player

It might let you change it

Depends on the platform you're using. Mobile you have the integrated player that doesn't support subtitle offset and the web player that does. Everything else is a version of the web player basically and they all support subtitle offset

I was wondering what jets had to do with internet!

Free open source software

Beautifully timed