Situation: here, where I pressed some video.
Problem: I try to stop the video by Javascript in the console of Firebug:
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Your video is requesting w/ the JSAPI enabled, so you are very close! All you need is a valid reference to the embedded player. Inspecting your page revealed that you are using the HTML DOM element id of "playerid" to identify your player.
Example:
To obtain a reference to the player and then stop the video use the following code:
var myPlayer = document.getElementById('playerid');
myPlayer.stopVideo();