Core
+ Add warning message that ffmpeg doesn't support SOCKS
* Improve thumbnail sorting
+ Extract formats from EXT-X-MEDIA tags in _extract_m3u8_formats
* Fill IV with leading zeros for IVs shorter than 16 octets in hlsnative
+ Add ac-3 to the list of audio codecs in parse_codecs
Extractors
* [periscope:user] Fix extraction (10453)
* [douyutv] Fix extraction (10153, 10318, 10444)
+ [nhk:vod] Add extractor for www3.nhk.or.jp on demand (4437, 10424)
- [trutube] Remove extractor (10438)
+ [usanetwork] Add extractor for usanetwork.com
* [crackle] Fix extraction (10333)
* [spankbang] Fix description and uploader extraction (10339)
* [discoverygo] Detect cable provider restricted videos (10425)
+ [cbc] Add support for watch.cbc.ca
* [kickstarter] Silent the warning for og:description (10415)
* [mtvservices:embedded] Fix extraction for the new 'edge' player (10363)