I was just reading a post on the Hubzilla support forum about video thumbnails. This should probably be turned into an article.
https://hubzilla.org/channel/adminsforum?mid=e78cedf1-13ea-5193-98aa-8d508f16f13e@
Harald EilertsenIf you're running your own hub, you should be able to change the thumbnail by setting the system.default_video_poster configuration.
You can do it from the terminal, like this:
$ ./util/config system default_video_poster url/to/my_poster.jpg
You can also set a specific poster to the videos you post, by adding it to the [video] tag like this:
[video poster='url/to/my_poster']video-link[/video]
(Yes, the url has to be in single quotes in this case. Not sure if that was a conscious decision or not.)
In the meantime, I threw it in my personal wiki as a reminder.
https://codejournal.dev/wiki/scott/Hubzilla/Videos
