Matthew SkalaOkay, so after some hours of messing around, it appears that the piece of software I really need is something called "ffserver". Which was announced to be EOL in mid-2016, and they finally removed from the relevant Git respository on January 6, 2018. Last version before they did that, did not work, and it appears impractical to figure out exactly how far to downgrade ffserver and its many dependencies to get an installation that will really work.
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.