A description of the various files are in the README

Changelog:

• Add option --concat-playlist to concat videos in a playlist
• Allow multiple and nested configuration files
• Add more post-processing stages (after_video, playlist)
• Allow --exec to be run at any post-processing stage (Deprecates --exec-before-download)
• Allow --print to be run at any post-processing stage
• Allow listing formats, thumbnails, subtitles using --print by pukkandan, Zirro
• Add fields video_autonumber, modified_date, modified_timestamp, playlist_count, channel_follower_count
• Add key requested_downloads in the root info_dict
• Write download_archive only after all formats are downloaded
• [FfmpegMetadata] Allow setting metadata of individual streams using meta<n>_ prefix
• Add option --legacy-server-connect by xtkoba
• Allow escaped , in --extractor-args
• Allow unicode characters in info.json
• Check for existing thumbnail/subtitle in final directory
• Don't treat empty containers as None in sanitize_info
• Fix -s --ignore-no-formats --force-write-archive
• Fix live title for multiple formats
• List playlist thumbnails in --list-thumbnails
• Raise error if subtitle download fails
• [cookies] Fix bug when keyring is unspecified
• [ffmpeg] Ignore unknown streams, standardize use of -map 0
• [outtmpl] Alternate form for D and fix suffix's case
• [utils] Add Sec-Fetch-Mode to std_headers
• [utils] Fix format_bytes output for Bytes by pukkandan, mdawar
• [utils] Handle ss:xxx in parse_duration
• [utils] Improve parsing for nested HTML elements by zmousm, pukkandan
• [utils] Use key None in traverse_obj to return as-is
• [extractor] Detect more subtitle codecs in MPD manifests by fstirlitz
• [extractor] Extract chapters from JSON-LD by iw0nderhow, pukkandan
• [extractor] Extract thumbnails from JSON-LD by nixxo
• [extractor] Improve url_result and related
• [generic] Improve KVS player extraction by trassshhub
• [build] Reduce dependency on third party workflows
• [extractor,cleanup] Use _search_nextjs_data, format_field
• [cleanup] Minor fixes and cleanup
• [docs] Improvements
• [test] Fix TestVerboseOutput
• [afreecatv] Add livestreams extractor by wlritchi
• [callin] Add extractor by foghawk
• [CrowdBunker] Add extractors by Ashish0804
• [daftsex] Add extractors by k3ns1n
• [digitalconcerthall] Add extractor by teridon
• [Drooble] Add extractor by u-spec-png
• [EuropeanTour] Add extractor by Ashish0804
• [iq.com] Add extractors by MinePlayersPE
• [KelbyOne] Add extractor by Ashish0804
• [LnkIE] Add extractor by Ashish0804
• [MainStreaming] Add extractor by coletdjnz
• [megatvcom] Add extractors by zmousm
• [Newsy] Add extractor by Ashish0804
• [noodlemagazine] Add extractor by trassshhub
• [PokerGo] Add extractors by Ashish0804
• [Pornez] Add extractor by mozlima
• [PRX] Add Extractors by coletdjnz
• [RTNews] Add extractor by Ashish0804
• [Rule34video] Add extractor by trassshhub
• [tvopengr] Add extractors by zmousm
• [Vimm] Add extractor by alerikaisattera
• [glomex] Add extractors by zmousm
• [instagram] Add story/highlight extractor by u-spec-png
• [openrec] Add movie extractor by Lesmiscore
• [rai] Add Raiplaysound extractors by nixxo, pukkandan
• [aparat] Fix extractor
• [ard] Extract subtitles by fstirlitz
• [BiliIntl] Add login by MinePlayersPE
• [CeskaTelevize] Use http for manifests
• [CTVNewsIE] Add fallback for video search by Ashish0804
• [dplay] Migrate DiscoveryPlusItaly to DiscoveryPlus by timendum
• [dplay] Re-structure DiscoveryPlus extractors
• [Dropbox] Support password protected files and more formats by zenerdi0de
• [facebook] Fix extraction from groups
• [facebook] Improve title and uploader extraction
• [facebook] Parse dash manifests
• [fox] Extract m3u8 from preview by ischmidt20
• [funk] Support origin URLs
• [gfycat] Fix uploader
• [gfycat] Support embeds by coletdjnz
• [hotstar] Add extractor args to ignore tags by Ashish0804
• [hrfernsehen] Fix ardloader extraction by CreaValix
• [instagram] Fix username extraction for stories and highlights by nyuszika7h
• [kakao] Detect geo-restriction
• [line] Remove tv.line.me by sian1468
• [mixch] Add MixchArchiveIE by Lesmiscore
• [mixcloud] Detect restrictions by llacb47
• [NBCSports] Fix extraction of platform URLs by ischmidt20
• [Nexx] Extract more metadata by MinePlayersPE
• [Nexx] Support 3q CDN by MinePlayersPE
• [pbs] de-prioritize AD formats
• [PornHub,YouTube] Refresh onion addresses by unit193
• [RedBullTV] Parse subtitles from manifest by Ashish0804
• [streamcz] Fix extractor by arkamar, pukkandan
• [Ted] Rewrite extractor by pukkandan, trassshhub
• [Theta] Fix valid URL by alerikaisattera
• [ThisOldHouseIE] Add support for premium videos by Ashish0804
• [TikTok] Fix extraction for sigi-based webpages, add API fallback by MinePlayersPE
• [TikTok] Pass cookies to formats, and misc fixes by MinePlayersPE
• [TikTok] Extract captions, user thumbnail by MinePlayersPE
• [TikTok] Change app version by MinePlayersPE, llacb47
• [TVer] Extract message for unaired live by Lesmiscore
• [twitcasting] Refactor extractor by Lesmiscore
• [twitter] Fix video in quoted tweets
• [veoh] Improve extractor by foghawk
• [vk] Capture clip URLs
• [vk] Fix VKUserVideosIE by Ashish0804
• [vk] Improve _VALID_URL by k3ns1n
• [VrtNU] Handle empty title by pgaig
• [XVideos] Check HLS formats by MinePlayersPE
• [yahoo:gyao] Improved playlist handling by hyano
• [youtube:tab] Extract more playlist metadata by coletdjnz, pukkandan
• [youtube:tab] Raise error on tab redirect by krichbanana, coletdjnz
• [youtube] Update Innertube clients by coletdjnz
• [youtube] Detect live-stream embeds
• [youtube] Do not return upload_date for playlists
• [youtube] Extract channel subscriber count by coletdjnz
• [youtube] Make invalid storyboard URL non-fatal
• [youtube] Enforce UTC, update innertube clients and tests by coletdjnz
• [zdf] Add chapter extraction by iw0nderhow
• [zee5] Add geo-bypass