When video is shared in Facebook, only Flash player is available

[vloo]

1. Open a video on wordpress.tv and play it => all is good.
2. Share the link in Facebook => video can't be played as it asks for Flash (which is bad).

[Otto42]

The video passed via OpenGraph is indeed a flash video. Example:

<meta property="og:video:type" content="application/x-shockwave-flash" />
<meta property="og:video" content="https://videopress.com/v/vbkXAcCQ" />
<meta property="og:video:secure_url" content="https://videopress.com/v/vbkXAcCQ" />

This is one of the types Facebook accepts.

​https://developers.facebook.com/docs/sharing/webmasters#media

They also accept video/mp4, which we should consider using instead, since that is also available:

<meta name="twitter:player:stream" content="https://wptv.files.wordpress.com/2015/11/davide-casali-four-steps-make-talk-wcvie-2015.mp4" />

[kraftbj]

This is on the wp.com/Jetpack side. I've opened a bug report at ​https://github.com/Automattic/jetpack/issues/2950 so we can update the og:video tags that we add.

For the sake of stating, it looks like the Twitter tags are theme-specific for the wordpress.tv theme while FB is stock wp.com/Jetpack.

[Otto42]

Jetpack's OpenGraph tags are easily overrideable, if we'd prefer to do that. The same theme code can do it easily, since it already knows the mp4 URL.

All we have to do is to add a filter to jetpack_open_graph_tags.

[kraftbj]

Set og:video tags to mp4

[kraftbj]

meta-1375.diff overrides the og:video tags to set mp4 and adds proper mp4 URLs.

[iandunn]

In 2038:

WordPress.tv: Embed MP4 videos in Facebook posts instead of Flash.

Fixes #1375
Props kraftbj