I have since posted a new Q to report a new development, but the post has not appeared over 24(?) hours later.
Now, no YouTube live streams will download. These are ones I've been downloading for weeks without problems - I've tested a Twitch live stream, that's downloading fine.
(Is it a coincidence that YT has today gone on strike as far as processing is concerned - uploads complete quickly but then processing sticks on 0%. Maybe YT has been hacked :o :o :o )
From Patricia @ 25 Oct 2019 11:10