Upgrade MediaElement to 2.21.2

[flyplugins]

Media Elements JS will not play YouTube video's on FireFox v44. This is a known issue by Media Elements JS and is fixed with version 2.19.0. Here is a direct link to the known issue: ​https://github.com/johndyer/mediaelement/issues/1684. Is it possible to get Media Elements in WP Core updated from 2.18.1 to latest which does resolve the issue?

The current version of MediaElement.js is 2.21.2. Does that version indeed solve the issue with YouTube videos? Because the issue you linked to is still open and hasn't been updated since April.

Yes, 2.21.2 does solve the issue.

I've setup an example in which I dequeue/deregister the current version of MEJS and enqueue the working version. Simply open FireFox and navigate to:

​http://s3mm.staging.wpengine.com/youtube-example-with-mejs-version-2-21-2/ <--Issue resolved with 2.21.2
​http://s3mm.staging.wpengine.com/youtube-example-with-mejs-version-2-18-1/ <--Issue exists with 2.18.1

Shortcode examples are listed on page.

We also have to update the Flash and Silverlight files others the player would be broken in IE8.

In 37887:

External Libraries: Update MediaElement.js to 2.21.2.

Includes a fix for broken YouTube embeds in Firefox.

Changelog: ​https://github.com/johndyer/mediaelement/blob/2.21.1/changelog.md
Diff: ​https://github.com/johndyer/mediaelement/compare/2.18.1...2.21.1

Props swissspidy.
Fixes #36759.

#37229 was marked as a duplicate.

For me youtube share link works, but the full URL do not

[video src="https://www.youtube.com/watch?v=mhnuES3Zgr4"] do not work for me but [video src="https://youtu.be/mhnuES3Zgr4"] works. Note that both of them are same url.

I just tested with version 38002 an it worked as expected for both Chrome and FireFox. As @sakibmoon mentioned, you must use the "share URL":

[video src="https://youtu.be/57MKxz4pJKE"]

@flyplugins, @sakibmoon: Created a new ticket for this: #37363.