a) The "|" (pipe symbol) found in the original file name is probably the source of the problem.
Cats4U
All titles from DR.dk have the pipe in site title ..
.. no way to change and change name template is irrelevant
You can forget b) because my post #4
all segments have only 1 kB - so the video dl is < 1 MB !
Germania
If the full dl fails (without any information), what should remux do?
DL movies with "Youtube Plus" works (with mp4)

The different is that I can play the movie in SF player ..

.. but playing an episode never starts in SF - that causes the problem