Hangs when adding videos from sbs.com.au

[TonyPuryer]

Great app, but it's having trouble with sbs.com.au. SBS is an Australian TV site that streams a lot of their shows on demand. Youtube-dl downloads the files quite well on it's own via the command line. I have installed it on a Seagate NAS running their own version of linux, with Entware installed. Using youtube-dl-webui does add the video link and it downloads it (checked it through ssh), but it hangs the youtube-dl-webui webserver, and the download ends / app hangs with with:

`[ffmpeg] Downloaded 78675326 bytes
 DEBUG -  worker.py:60  - debug: [download] 100% of 75.03MiB in 01:00
 DEBUG -  worker.py:21  - finished status`

If I kill it with ctrl-c, it says

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/popen_fork.py", line 28, in poll
KeyboardInterrupt

then if I run it again, it tries to download the same file again. I have to kill it and manually delete the .db file to get it to work again.

Here is a link to the shortest video on SBS that I could find (7 mins), if you are interested and have the time to debug this problem it would be appreciated. https://www.sbs.com.au/ondemand/video/1224316483949/kaeloo-lets-play-me-nopoly

Many thanks, Tony