Putting an embed link from Twitch.tv or a link from gaming.youtube.com (no embed is provided) are both not supported right now. But I have found a workaround for this! Just follow these very simple steps and your live stream will work inside your Steemit post!!
Step 1
Get setup to stream on Youtube's gaming section at gaming.youtube.com. I use Open Broadcast Software myself and this video will walk you through the setup for broadcasting to your Youtube Gaming chanel:
Step 2
Once you are streaming to Youtube Gaming, goto your channel where the URL will start with a gaming.youtube.com/watch address. As you will see the only share option here is a direct link (versus the normal embed) which doesn't actually work to show a video in a Steemit post.
All you have to do is change the gaming.youtube.com part of the URL to www.youtube.com (make sure to keep the rest of the URL the same, just change gaming to www.) This will then reload the page without the gaming overlay, making it look like any other youtube video or stream page. From here, simply click the share button, select embed, and copy the iframe link they provide you.
Just paste this embed/iframe link into your post...and you are set to go!
Here is a live stream of an Overwatch competition going on right now as an example!
Image Sources:
Screenshot was from the example live stream that was embedded here.