youtube-dl 2020.12.07

Core

• [extractor/common] Extract timestamp from Last-Modified header

• [extractor/common] Add support for dl8-* media tags (#27283)

• [extractor/common] Fix media type extraction for HTML5 media tags
  in start/end form

Extractors

• [aenetworks] Fix extraction (#23363, #23390, #26795, #26985)
  • Fix Fastly format extraction
  • Add support for play and watch subdomains
  • Extract series metadata
• [youtube] Improve youtu.be extraction in non-existing playlists (#27324)

• [generic] Extract RSS video description, timestamp and itunes metadata
  (#27177)

• [nrk] Reduce the number of instalments and episodes requests
• [nrk] Improve extraction
  • Improve format extraction for old akamai formats
  • Add is_live value to entry info dict
  • Request instalments only when available
  • Fix skole extraction

• [peertube] Extract fps
• [peertube] Recognize audio-only formats (#27295)