diff --git a/.github/ISSUE_TEMPLATE/3_site_feature_request.yml b/.github/ISSUE_TEMPLATE/3_site_feature_request.yml
index 7de8b719f3..0ebb8748e3 100644
--- a/.github/ISSUE_TEMPLATE/3_site_feature_request.yml
+++ b/.github/ISSUE_TEMPLATE/3_site_feature_request.yml
@@ -32,7 +32,7 @@ body:
       label: Example URLs
       description: |
         Example URLs that can be used to demonstrate the requested feature
-      value: |
+      placeholder: |
         https://www.youtube.com/watch?v=BaW_jenozKc
     validations:
       required: true
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index ee5d90dea7..d24326fb67 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -178,3 +178,15 @@ jaller94
 r5d
 julien-hadleyjack
 git-anony-mouse
+mdawar
+trassshhub
+foghawk
+k3ns1n
+teridon
+mozlima
+timendum
+ischmidt20
+CreaValix
+sian1468
+arkamar
+hyano
diff --git a/Changelog.md b/Changelog.md
index 5c30457023..a0e9af2e05 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -11,6 +11,128 @@ # Instuctions for creating release
 -->
 
 
+### 2022.01.21
+
+* 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](https://github.com/pukkandan), [Zirro](https://github.com/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](https://github.com/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](https://github.com/pukkandan), [mdawar](https://github.com/mdawar)
+* [utils] Handle `ss:xxx` in `parse_duration`
+* [utils] Improve parsing for nested HTML elements by [zmousm](https://github.com/zmousm), [pukkandan](https://github.com/pukkandan)
+* [utils] Use key `None` in `traverse_obj` to return as-is
+* [extractor] Detect more subtitle codecs in MPD manifests by [fstirlitz](https://github.com/fstirlitz)
+* [extractor] Extract chapters from JSON-LD by [iw0nderhow](https://github.com/iw0nderhow), [pukkandan](https://github.com/pukkandan)
+* [extractor] Extract thumbnails from JSON-LD by [nixxo](https://github.com/nixxo)
+* [extractor] Improve `url_result` and related
+* [generic] Improve KVS player extraction by [trassshhub](https://github.com/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](https://github.com/wlritchi)
+* [callin] Add extractor by [foghawk](https://github.com/foghawk)
+* [CrowdBunker] Add extractors by [Ashish0804](https://github.com/Ashish0804)
+* [daftsex] Add extractors by [k3ns1n](https://github.com/k3ns1n)
+* [digitalconcerthall] Add extractor by [teridon](https://github.com/teridon)
+* [Drooble] Add extractor by [u-spec-png](https://github.com/u-spec-png)
+* [EuropeanTour] Add extractor by [Ashish0804](https://github.com/Ashish0804)
+* [iq.com] Add extractors by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [KelbyOne] Add extractor by [Ashish0804](https://github.com/Ashish0804)
+* [LnkIE] Add extractor by [Ashish0804](https://github.com/Ashish0804)
+* [MainStreaming] Add extractor by [coletdjnz](https://github.com/coletdjnz)
+* [megatvcom] Add extractors by [zmousm](https://github.com/zmousm)
+* [Newsy] Add extractor by [Ashish0804](https://github.com/Ashish0804)
+* [noodlemagazine] Add extractor by [trassshhub](https://github.com/trassshhub)
+* [PokerGo] Add extractors by [Ashish0804](https://github.com/Ashish0804)
+* [Pornez] Add extractor by [mozlima](https://github.com/mozlima)
+* [PRX] Add Extractors by [coletdjnz](https://github.com/coletdjnz)
+* [RTNews] Add extractor by [Ashish0804](https://github.com/Ashish0804)
+* [Rule34video] Add extractor by [trassshhub](https://github.com/trassshhub)
+* [tvopengr] Add extractors by [zmousm](https://github.com/zmousm)
+* [Vimm] Add extractor by [alerikaisattera](https://github.com/alerikaisattera)
+* [glomex] Add extractors by [zmousm](https://github.com/zmousm)
+* [instagram] Add story/highlight extractor by [u-spec-png](https://github.com/u-spec-png)
+* [openrec] Add movie extractor by [Lesmiscore](https://github.com/Lesmiscore)
+* [rai] Add Raiplaysound extractors by [nixxo](https://github.com/nixxo), [pukkandan](https://github.com/pukkandan)
+* [aparat] Fix extractor
+* [ard] Extract subtitles by [fstirlitz](https://github.com/fstirlitz)
+* [BiliIntl] Add login by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [CeskaTelevize] Use `http` for manifests
+* [CTVNewsIE] Add fallback for video search by [Ashish0804](https://github.com/Ashish0804)
+* [dplay] Migrate DiscoveryPlusItaly to DiscoveryPlus by [timendum](https://github.com/timendum)
+* [dplay] Re-structure DiscoveryPlus extractors
+* [Dropbox] Support password protected files and more formats by [zenerdi0de](https://github.com/zenerdi0de)
+* [facebook] Fix extraction from groups
+* [facebook] Improve title and uploader extraction
+* [facebook] Parse dash manifests
+* [fox] Extract m3u8 from preview by [ischmidt20](https://github.com/ischmidt20)
+* [funk] Support origin URLs
+* [gfycat] Fix `uploader`
+* [gfycat] Support embeds by [coletdjnz](https://github.com/coletdjnz)
+* [hotstar] Add extractor args to ignore tags by [Ashish0804](https://github.com/Ashish0804)
+* [hrfernsehen] Fix ardloader extraction by [CreaValix](https://github.com/CreaValix)
+* [instagram] Fix username extraction for stories and highlights by [nyuszika7h](https://github.com/nyuszika7h)
+* [kakao] Detect geo-restriction
+* [line] Remove `tv.line.me` by [sian1468](https://github.com/sian1468)
+* [mixch] Add `MixchArchiveIE` by [Lesmiscore](https://github.com/Lesmiscore)
+* [mixcloud] Detect restrictions by [llacb47](https://github.com/llacb47)
+* [NBCSports] Fix extraction of platform URLs by [ischmidt20](https://github.com/ischmidt20)
+* [Nexx] Extract more metadata by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [Nexx] Support 3q CDN by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [pbs] de-prioritize AD formats
+* [PornHub,YouTube] Refresh onion addresses by [unit193](https://github.com/unit193)
+* [RedBullTV] Parse subtitles from manifest by [Ashish0804](https://github.com/Ashish0804)
+* [streamcz] Fix extractor by [arkamar](https://github.com/arkamar), [pukkandan](https://github.com/pukkandan)
+* [Ted] Rewrite extractor by [pukkandan](https://github.com/pukkandan), [trassshhub](https://github.com/trassshhub)
+* [Theta] Fix valid URL by [alerikaisattera](https://github.com/alerikaisattera)
+* [ThisOldHouseIE] Add support for premium videos by [Ashish0804](https://github.com/Ashish0804)
+* [TikTok] Fix extraction for sigi-based webpages, add API fallback by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [TikTok] Pass cookies to formats, and misc fixes by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [TikTok] Extract captions, user thumbnail by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [TikTok] Change app version by [MinePlayersPE](https://github.com/MinePlayersPE), [llacb47](https://github.com/llacb47)
+* [TVer] Extract message for unaired live by [Lesmiscore](https://github.com/Lesmiscore)
+* [twitcasting] Refactor extractor by [Lesmiscore](https://github.com/Lesmiscore)
+* [twitter] Fix video in quoted tweets
+* [veoh] Improve extractor by [foghawk](https://github.com/foghawk)
+* [vk] Capture `clip` URLs
+* [vk] Fix VKUserVideosIE by [Ashish0804](https://github.com/Ashish0804)
+* [vk] Improve `_VALID_URL` by [k3ns1n](https://github.com/k3ns1n)
+* [VrtNU] Handle empty title by [pgaig](https://github.com/pgaig)
+* [XVideos] Check HLS formats by [MinePlayersPE](https://github.com/MinePlayersPE)
+* [yahoo:gyao] Improved playlist handling by [hyano](https://github.com/hyano)
+* [youtube:tab] Extract more playlist metadata by [coletdjnz](https://github.com/coletdjnz), [pukkandan](https://github.com/pukkandan)
+* [youtube:tab] Raise error on tab redirect by [krichbanana](https://github.com/krichbanana), [coletdjnz](https://github.com/coletdjnz)
+* [youtube] Update Innertube clients by [coletdjnz](https://github.com/coletdjnz)
+* [youtube] Detect live-stream embeds
+* [youtube] Do not return `upload_date` for playlists
+* [youtube] Extract channel subscriber count by [coletdjnz](https://github.com/coletdjnz)
+* [youtube] Make invalid storyboard URL non-fatal
+* [youtube] Enforce UTC, update innertube clients and tests by [coletdjnz](https://github.com/coletdjnz)
+* [zdf] Add chapter extraction by [iw0nderhow](https://github.com/iw0nderhow)
+* [zee5] Add geo-bypass
+
+
 ### 2021.12.27
 
 * Avoid recursion error when re-extracting info
diff --git a/Collaborators.md b/Collaborators.md
index 0616e29e47..29d320dd6c 100644
--- a/Collaborators.md
+++ b/Collaborators.md
@@ -41,7 +41,7 @@ ## [Ashish0804](https://github.com/Ashish0804)
 * Improved/fixed support for HiDive, HotStar, Hungama, LBRY, LinkedInLearning, Mxplayer, SonyLiv, TV2, Vimeo, VLive etc
 
 
-## [Lesmicore](https://github.com/Lesmiscore) (nao20010128nao)
+## [Lesmiscore](https://github.com/Lesmiscore) (nao20010128nao)
 
 **Bitcoin**: bc1qfd02r007cutfdjwjmyy9w23rjvtls6ncve7r3s  
 **Monacoin**: mona1q3tf7dzvshrhfe3md379xtvt2n22duhglv5dskr
diff --git a/README.md b/README.md
index f092a83d17..d3fbdd6e45 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ # NEW FEATURES
     * Redirect channel's home URL automatically to `/video` to preserve the old behaviour
     * `255kbps` audio is extracted (if available) from youtube music when premium cookies are given
     * Youtube music Albums, channels etc can be downloaded ([except self-uploaded music](https://github.com/yt-dlp/yt-dlp/issues/723))
-    * Download livestreams from the start using `--live-from-start`
+    * Download livestreams from the start using `--live-from-start` (experimental)
 
 * **Cookies from browser**: Cookies can be automatically extracted from all major web browsers using `--cookies-from-browser BROWSER[+KEYRING][:PROFILE]`
 
@@ -110,9 +110,9 @@ # NEW FEATURES
 
 * **Output template improvements**: Output templates can now have date-time formatting, numeric offsets, object traversal etc. See [output template](#output-template) for details. Even more advanced operations can also be done with the help of `--parse-metadata` and `--replace-in-metadata`
 
-* **Other new options**: Many new options have been added such as `--print`, `--wait-for-video`, `--sleep-requests`, `--convert-thumbnails`, `--write-link`, `--force-download-archive`, `--force-overwrites`, `--break-on-reject` etc
+* **Other new options**: Many new options have been added such as `--concat-playlist`, `--print`, `--wait-for-video`, `--sleep-requests`, `--convert-thumbnails`, `--write-link`, `--force-download-archive`, `--force-overwrites`, `--break-on-reject` etc
 
-* **Improvements**: Regex and other operators in `--match-filter`, multiple `--postprocessor-args` and `--downloader-args`, faster archive checking, more [format selection options](#format-selection), merge multi-video/audio, multiple `--config-locations`, etc
+* **Improvements**: Regex and other operators in `--match-filter`, multiple `--postprocessor-args` and `--downloader-args`, faster archive checking, more [format selection options](#format-selection), merge multi-video/audio, multiple `--config-locations`, `--exec` at different stages, etc
 
 * **Plugins**: Extractors and PostProcessors can be loaded from an external file. See [plugins](#plugins) for details
 
@@ -723,6 +723,9 @@ ## Verbosity and Simulation Options:
 
 ## Workarounds:
     --encoding ENCODING              Force the specified encoding (experimental)
+    --legacy-server-connect          Explicitly allow HTTPS connection to
+                                     servers that do not support RFC 5746 secure
+                                     renegotiation
     --no-check-certificates          Suppress HTTPS certificate validation
     --prefer-insecure                Use an unencrypted connection to retrieve
                                      information about the video (Currently
diff --git a/supportedsites.md b/supportedsites.md
index 9dc94f27d3..a55b3ee131 100644
--- a/supportedsites.md
+++ b/supportedsites.md
@@ -41,6 +41,7 @@ # Supported sites
  - **aenetworks:collection**
  - **aenetworks:show**
  - **afreecatv**: afreecatv.com
+ - **afreecatv:live**: afreecatv.com
  - **AirMozilla**
  - **AliExpressLive**
  - **AlJazeera**
@@ -162,6 +163,7 @@ # Supported sites
  - **BuzzFeed**
  - **BYUtv**
  - **CableAV**
+ - **Callin**
  - **CAM4**
  - **Camdemy**
  - **CamdemyFolder**
@@ -232,6 +234,8 @@ # Supported sites
  - **Cracked**
  - **Crackle**
  - **CrooksAndLiars**
+ - **CrowdBunker**
+ - **CrowdBunkerChannel**
  - **crunchyroll**
  - **crunchyroll:beta**
  - **crunchyroll:playlist**
@@ -246,6 +250,7 @@ # Supported sites
  - **curiositystream:collections**
  - **curiositystream:series**
  - **CWTV**
+ - **Daftsex**
  - **DagelijkseKost**: dagelijksekost.een.be
  - **DailyMail**
  - **dailymotion**
@@ -265,6 +270,7 @@ # Supported sites
  - **democracynow**
  - **DHM**: Filmarchiv - Deutsches Historisches Museum
  - **Digg**
+ - **DigitalConcertHall**: DigitalConcertHall extractor
  - **DigitallySpeaking**
  - **Digiteka**
  - **Discovery**
@@ -288,6 +294,7 @@ # Supported sites
  - **DouyuTV**: 斗鱼
  - **DPlay**
  - **DRBonanza**
+ - **Drooble**
  - **Dropbox**
  - **Dropout**
  - **DropoutSeason**
@@ -330,6 +337,7 @@ # Supported sites
  - **ESPNCricInfo**
  - **EsriVideo**
  - **Europa**
+ - **EuropeanTour**
  - **EUScreen**
  - **EWETV**
  - **ExpoTV**
@@ -407,6 +415,8 @@ # Supported sites
  - **Glide**: Glide mobile video messages (glide.me)
  - **Globo**
  - **GloboArticle**
+ - **glomex**: Glomex videos
+ - **glomex:embed**: Glomex embedded videos
  - **Go**
  - **GodTube**
  - **Gofile**
@@ -470,6 +480,7 @@ # Supported sites
  - **IndavideoEmbed**
  - **InfoQ**
  - **Instagram**
+ - **instagram:story**
  - **instagram:tag**: Instagram hashtag search URLs
  - **instagram:user**: Instagram user profile
  - **InstagramIOS**: IOS instagram:// URL
@@ -477,6 +488,8 @@ # Supported sites
  - **InternetVideoArchive**
  - **IPrima**
  - **IPrimaCNN**
+ - **iq.com**: International version of iQiyi
+ - **iq.com:album**
  - **iqiyi**: 爱奇艺
  - **Ir90Tv**
  - **ITTF**
@@ -500,6 +513,7 @@ # Supported sites
  - **KarriereVideos**
  - **Katsomo**
  - **KeezMovies**
+ - **KelbyOne**
  - **Ketnet**
  - **khanacademy**
  - **khanacademy:unit**
@@ -545,7 +559,6 @@ # Supported sites
  - **limelight:channel_list**
  - **LineLive**
  - **LineLiveChannel**
- - **LineTV**
  - **LinkedIn**
  - **linkedin:learning**
  - **linkedin:learning:course**
@@ -554,6 +567,7 @@ # Supported sites
  - **LiveJournal**
  - **livestream**
  - **livestream:original**
+ - **Lnk**
  - **LnkGo**
  - **loc**: Library of Congress
  - **LocalNews8**
@@ -566,6 +580,7 @@ # Supported sites
  - **mailru**: Видео@Mail.Ru
  - **mailru:music**: Музыка@Mail.Ru
  - **mailru:music:search**: Музыка@Mail.Ru
+ - **MainStreaming**: MainStreaming Player
  - **MallTV**
  - **mangomolo:live**
  - **mangomolo:video**
@@ -592,6 +607,8 @@ # Supported sites
  - **MediasiteNamedCatalog**
  - **Medici**
  - **megaphone.fm**: megaphone.fm embedded players
+ - **megatvcom**: megatv.com videos
+ - **megatvcom:embed**: megatv.com embedded videos
  - **Meipai**: 美拍
  - **MelonVOD**
  - **META**
@@ -615,6 +632,7 @@ # Supported sites
  - **mirrativ:user**
  - **MiTele**: mitele.es
  - **mixch**
+ - **mixch:archive**
  - **mixcloud**
  - **mixcloud:playlist**
  - **mixcloud:user**
@@ -704,6 +722,7 @@ # Supported sites
  - **Newgrounds:playlist**
  - **Newgrounds:user**
  - **Newstube**
+ - **Newsy**
  - **NextMedia**: 蘋果日報
  - **NextMediaActionNews**: 蘋果日報 - 動新聞
  - **NextTV**: 壹電視
@@ -733,6 +752,7 @@ # Supported sites
  - **NJPWWorld**: 新日本プロレスワールド
  - **NobelPrize**
  - **NonkTube**
+ - **NoodleMagazine**
  - **Noovo**
  - **Normalboots**
  - **NosVideo**
@@ -785,6 +805,7 @@ # Supported sites
  - **OpencastPlaylist**
  - **openrec**
  - **openrec:capture**
+ - **openrec:movie**
  - **OraTV**
  - **orf:burgenland**: Radio Burgenland
  - **orf:fm4**: radio FM4
@@ -856,6 +877,8 @@ # Supported sites
  - **podomatic**
  - **Pokemon**
  - **PokemonWatch**
+ - **PokerGo**
+ - **PokerGoCollection**
  - **PolsatGo**
  - **PolskieRadio**
  - **polskieradio:kierowcow**
@@ -867,6 +890,7 @@ # Supported sites
  - **PopcornTV**
  - **PornCom**
  - **PornerBros**
+ - **Pornez**
  - **PornFlip**
  - **PornHd**
  - **PornHub**: PornHub and Thumbzilla
@@ -881,6 +905,11 @@ # Supported sites
  - **PressTV**
  - **ProjectVeritas**
  - **prosiebensat1**: ProSiebenSat.1 Digital
+ - **PRXAccount**
+ - **PRXSeries**
+ - **prxseries:search**: PRX Series Search; "prxseries:" prefix
+ - **prxstories:search**: PRX Stories Search; "prxstories:" prefix
+ - **PRXStory**
  - **puhutv**
  - **puhutv:serie**
  - **Puls4**
@@ -914,8 +943,9 @@ # Supported sites
  - **RaiPlay**
  - **RaiPlayLive**
  - **RaiPlayPlaylist**
- - **RaiPlayRadio**
- - **RaiPlayRadioPlaylist**
+ - **RaiPlaySound**
+ - **RaiPlaySoundLive**
+ - **RaiPlaySoundPlaylist**
  - **RayWenderlich**
  - **RayWenderlichCourse**
  - **RBMARadio**
@@ -950,12 +980,15 @@ # Supported sites
  - **Roxwel**
  - **Rozhlas**
  - **RTBF**
+ - **RTDocumentry**
+ - **RTDocumentryPlaylist**
  - **rte**: Raidió Teilifís Éireann TV
  - **rte:radio**: Raidió Teilifís Éireann radio
  - **rtl.nl**: rtl.nl and rtlxl.nl
  - **rtl2**
  - **rtl2:you**
  - **rtl2:you:series**
+ - **RTNews**
  - **RTP**
  - **RTRFM**
  - **RTS**: RTS.ch
@@ -967,8 +1000,10 @@ # Supported sites
  - **RTVNH**
  - **RTVS**
  - **RUHD**
+ - **Rule34Video**
  - **RumbleChannel**
  - **RumbleEmbed**
+ - **Ruptly**
  - **rutube**: Rutube videos
  - **rutube:channel**: Rutube channel
  - **rutube:embed**: Rutube embedded videos
@@ -1109,7 +1144,10 @@ # Supported sites
  - **TeamTreeHouse**
  - **TechTalks**
  - **techtv.mit.edu**
- - **ted**
+ - **TedEmbed**
+ - **TedPlaylist**
+ - **TedSeries**
+ - **TedTalk**
  - **Tele13**
  - **Tele5**
  - **TeleBruxelles**
@@ -1207,6 +1245,8 @@ # Supported sites
  - **TVNowNew**
  - **TVNowSeason**
  - **TVNowShow**
+ - **tvopengr:embed**: tvopen.gr embedded videos
+ - **tvopengr:watch**: tvopen.gr (and ethnos.gr) videos
  - **tvp**: Telewizja Polska
  - **tvp:embed**: Telewizja Polska
  - **tvp:series**
@@ -1299,6 +1339,7 @@ # Supported sites
  - **vimeo:review**: Review pages on vimeo
  - **vimeo:user**
  - **vimeo:watchlater**: Vimeo watch later list, "vimeowatchlater" keyword (requires authentication)
+ - **Vimm**
  - **Vimple**: Vimple - one-click video hosting
  - **Vine**
  - **vine:user**
@@ -1425,9 +1466,10 @@ # Supported sites
  - **youtube:search_url**: YouTube search URLs with sorting and filter support
  - **youtube:subscriptions**: YouTube subscriptions feed; ":ytsubs" keyword (requires cookies)
  - **youtube:tab**: YouTube Tabs
+ - **youtube:user**: YouTube user videos; "ytuser:" prefix
  - **youtube:watchlater**: Youtube watch later list; ":ytwatchlater" keyword (requires cookies)
+ - **YoutubeLivestreamEmbed**: YouTube livestream embeds
  - **YoutubeYtBe**: youtu.be
- - **YoutubeYtUser**: YouTube user videos; "ytuser:" prefix
  - **Zapiks**
  - **Zattoo**
  - **ZattooLive**