When you create the post, you’ll need to add the video details in the box labelled “iG:Twitter Cards”. Check the second screenshot
Also, as mentioned in the FAQs, the video URL needs to be https & not http
If you are hosting your videos then you need to be white-listed by Twitter first before you can start using player cards.
If you’re using YouTube for videos then you should be ok by using YouTube embed URL. Fo eg., if your YouTube video is at http://www.youtube.com/watch?v=gSng3z18GOk then your embed URL would be https://www.youtube.com/embed/gSng3z18GOk. This is available in embed options on every YouTube video page. Just remember that it should start with https to work with Twitter player cards.
Here is the page.
http://www.rockthemullet.com/the-lamour-era/
The tweet button does not seem to embed the video.
Author’s Twitter Handle: @ (left blank)
Card type: Player
Video source: https://www.youtube.com/embed/S8LNmqk8bDU?rel=0
width: 560, height: 315
Image for player card: https://www.rockthemullet.com/wp-content/uploads/2013/07/hqdefault257.jpg
I’m using the Jetpack social sharing icons.
Not sure why it doesn’t work. Thanks.
Jetpack or any tweet button has no relation whatsoever with this plugin. It works independent of any social sharing plugins you may use.
In your wp-admin, on the post edit screen, you need to select the twitter card type as “player” and then enter the video details and then save the post.
Here is the page.
http://www.rockthemullet.com/the-lamour-era/
The tweet button does not seem to embed the video.
For this page the card type is still set to “summary” & that is why video is not showing up on Twitter.