Youtube-dl

Core
* [postprocessor/embedthumbnail] Skip embedding when there aren't any
thumbnails (12573)
* [extractor/common] Improve jwplayer subtitles extraction (15695)

Extractors
+ [vidlii] Add support for vidlii.com (14472, 14512, 14779)
+ [streamango] Capture and output error messages
* [streamango] Fix extraction (14160, 14256)
+ [telequebec] Add support for emissions (14649, 14655)
+ [telequebec:live] Add support for live streams (15688)
+ [mailru:music] Add support for mail.ru/music (15618)
* [aenetworks] Switch to akamai HLS formats (15612)
* [ytsearch] Fix flat title extraction (11260, 15681)

Core
+ [utils] Fixup some common URL typos in sanitize_url (15649)
* Respect --prefer-insecure while updating (15497)

Extractors
* [vidio] Fix HLS URL extraction (15675)
+ [nexx] Add support for arc.nexx.cloud URLs
* [nexx] Switch to arc API (15652)
* [redtube] Fix duration extraction (15659)
+ [sonyliv] Respect referrer (15648)
+ [brightcove:new] Use referrer for formats' HTTP headers
+ [cbc] Add support for olympics.cbc.ca (15535)
+ [fusion] Add support for fusion.tv (15628)
* [npo] Improve quality metadata extraction
* [npo] Relax URL regular expression (14987, 14994)
+ [npo] Capture and output error message
+ [pornhub] Add support for channels (15613)
* [youtube] Handle shared URLs with generic extractor (14303)

Core
+ [YoutubeDL] Add support for filesize_approx in format selector (15550)

Extractors
+ [francetv] Add support for live streams (13689)
+ [francetv] Add support for zouzous.fr and ludo.fr (10454, 13087, 13103,
15012)
* [francetv] Separate main extractor and rework others to delegate to it
* [francetv] Improve manifest URL signing (15536)
+ [francetv] Sign m3u8 manifest URLs (15565)
+ [veoh] Add support for embed URLs (15561)
* [afreecatv] Fix extraction (15556)
* [periscope] Use accessVideoPublic endpoint (15554)
* [discovery] Fix auth request (15542)
+ [6play] Extract subtitles (15541)
* [newgrounds] Fix metadata extraction (15531)
+ [nbc] Add support for stream.nbcolympics.com (10295)
* [dvtv] Fix live streams extraction (15442)

Extractors
+ [myvi] Extend URL regular expression
+ [myvi:embed] Add support for myvi.tv embeds (15521)
+ [prosiebensat1] Extend URL regular expression (15520)
* [pokemon] Relax URL regular expression and extend title extraction (15518)
+ [gameinformer] Use geo verification headers
* [la7] Fix extraction (15501, 15502)
* [gameinformer] Fix brightcove id extraction (15416)
+ [afreecatv] Pass referrer to video info request (15507)
+ [telebruxelles] Add support for live streams
* [telebruxelles] Relax URL regular expression
* [telebruxelles] Fix extraction (15504)
* [extractor/common] Respect secure schemes in _extract_wowza_formats

Core
* [downloader/http] Randomize HTTP chunk size
+ [downloader/http] Add ability to pass downloader options via info dict
* [downloader/http] Fix 302 infinite loops by not reusing requests
+ Document http_chunk_size

Extractors
+ [brightcove] Pass embed page URL as referrer (15486)
+ [youtube] Enforce using chunked HTTP downloading for DASH formats

Core
+ Introduce --http-chunk-size for chunk-based HTTP downloading
+ Add support for IronPython
* [downloader/ism] Fix Python 3.2 support

Extractors
* [redbulltv] Fix extraction (15481)
* [redtube] Fix metadata extraction (15472)
* [pladform] Respect platform id and extract HLS formats (15468)
- [rtlnl] Remove progressive formats (15459)
* [6play] Do no modify asset URLs with a token (15248)
* [nationalgeographic] Relax URL regular expression
* [dplay] Relax URL regular expression (15458)
* [cbsinteractive] Fix data extraction (15451)
+ [amcnetworks] Add support for sundancetv.com (9260)