[prosiebensat1] stuck download

[Esokrates]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.01.15
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

user@ubuntu:/tmp$ python3 /usr/local/bin/youtube-dl "https://www.sat1gold.at/film/filmreihen/der-bulle-von-toelz/der-bulle-von-toelz-tod-im-internat/12-der-bulle-von-toelz-tod-im-internat-ganze-folge" -o S01E02.mp4 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.sat1gold.at/film/filmreihen/der-bulle-von-toelz/der-bulle-von-toelz-tod-im-internat/12-der-bulle-von-toelz-tod-im-internat-ganze-folge', '-o', 'S01E02.mp4', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.01.15
[debug] Python version 3.7.6 (CPython) - Linux-5.4.0-9-generic-x86_64-with-Ubuntu-20.04-focal
[debug] exe versions: ffmpeg 4.2.1, ffprobe 4.2.1, phantomjs 14311
[debug] Proxy map: {}
[prosiebensat1] film/filmreihen/der-bulle-von-toelz/der-bulle-von-toelz-tod-im-internat/12-der-bulle-von-toelz-tod-im-internat-ganze-folge: Downloading webpage

The download is stuck at "Downloading webpage" forever, no output file is created.

[dstftw]

Use strace to see the reason.