Hello,
Youtube playlist are not support (for now) in HTML5, only single youtube video are support in HTML5 via a specific mechanism :
YouTube Failover
JW Player 5.3 allows for YouTube playback on all platforms via a specially crafted embed mechanism. Unfortunately, this embed mechanism does not provide an API, and hence, including a YouTube embed disrupts the player. Once YouTube makes their HTML5 API available, we will improve support.
www.longtailvideo.com/support/jw-player/...rt#currentplayerlims