From: https://developer.vimeo.com/player/js-api#universal-event-spec
If you’re embedding and controlling multiple players on a page or
using our JS API library (Froogaloop), you should give each player a
player_id that matches the id of the iframe element.http://player.vimeo.com/video/VIDEO_ID?api=1&player_id=vimeoplayer
You may need to add the player_id query parameter to the src definition.