Changing playlist items without rebuffering

I’m trying to modify the urls of items in my video nodes content (which is a playlist) while the video node is playing. for example, I may want to replace the fourth item in the playlist while the first item is playing, or delete and append items to the playlist while the content is playing.

Whenever I try to either change the url of an existing item in the playlist, or replace an entire ContentNode nothing happens, ie when that playlist gets to that index it still plays the old url