If you look further below in the JSON file, there is (finally) a media type of application/x-mpegURL which is what snac finds and uses to insert the video tag.

It's a mystery to me why it doesn't show it on your system.

As @beelseal@snac.beelseal.com mentions above, they only get a usable video when they add it via the search box. The only reason I'm able to guess is that the post content that arrives first is different that what gets downloded afterwards from the search box.

I'll investigate it further.

CC: @gmc@snac.chasmcity.net