The release notes for JWPlayer v8, indicate that support for embedding YouTube videos has been dropped:
https://support.jwplayer.com/customer/portal/articles/2870361-introducing-jw8
Here's a conversation about it on Github that they have locked:
https://github.com/jwplayer/jwplayer/issues/2233
I enjoyed using JWPlayer because I could use the same api and player interface for embedding YouTube videos and non-YouTube videos.
Is anyone developing a JWPlayer provider for YouTube? Is there an alternative to JWPlayer that supports YouTube and non-YouTube videos?