diff --git a/.gitignore b/.gitignore
index 5dc82ccbe5..fd51ad66eb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,6 +24,7 @@ cookies
 
 *.3gp
 *.ape
+*.ass
 *.avi
 *.desktop
 *.flac
@@ -106,6 +107,7 @@ yt-dlp.zip
 *.iml
 .vscode
 *.sublime-*
+*.code-workspace
 
 # Lazy extractors
 */extractor/lazy_extractors.py
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bfa8ae410c..dbd6a84b25 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -11,6 +11,7 @@ # CONTRIBUTING TO YT-DLP
     - [Is anyone going to need the feature?](#is-anyone-going-to-need-the-feature)
     - [Is your question about yt-dlp?](#is-your-question-about-yt-dlp)
     - [Are you willing to share account details if needed?](#are-you-willing-to-share-account-details-if-needed)
+    - [Is the website primarily used for piracy](#is-the-website-primarily-used-for-piracy)
 - [DEVELOPER INSTRUCTIONS](#developer-instructions)
     - [Adding new feature or making overarching changes](#adding-new-feature-or-making-overarching-changes)
     - [Adding support for a new site](#adding-support-for-a-new-site)
@@ -24,6 +25,7 @@ # CONTRIBUTING TO YT-DLP
         - [Collapse fallbacks](#collapse-fallbacks)
         - [Trailing parentheses](#trailing-parentheses)
         - [Use convenience conversion and parsing functions](#use-convenience-conversion-and-parsing-functions)
+    - [My pull request is labeled pending-fixes](#my-pull-request-is-labeled-pending-fixes)
 - [EMBEDDING YT-DLP](README.md#embedding-yt-dlp)
 
 
@@ -123,6 +125,10 @@ ### Are you willing to share account details if needed?
 - Change the password before sharing the account to something random (use [this](https://passwordsgenerator.net/) if you don't have a random password generator).
 - Change the password after receiving the account back.
 
+### Is the website primarily used for piracy?
+
+We follow [youtube-dl's policy](https://github.com/ytdl-org/youtube-dl#can-you-add-support-for-this-anime-video-site-or-site-which-shows-current-movies-for-free) to not support services that is primarily used for infringing copyright. Additionally, it has been decided to not to support porn sites that specialize in deep fake. We also cannot support any service that serves only [DRM protected content](https://en.wikipedia.org/wiki/Digital_rights_management). 
+
 
 
 
@@ -210,7 +216,7 @@ ## Adding support for a new site
             }
     ```
 1. Add an import in [`yt_dlp/extractor/extractors.py`](yt_dlp/extractor/extractors.py).
-1. Run `python test/test_download.py TestDownload.test_YourExtractor`. This *should fail* at first, but you can continually re-run it until you're done. If you decide to add more than one test, the tests will then be named `TestDownload.test_YourExtractor`, `TestDownload.test_YourExtractor_1`, `TestDownload.test_YourExtractor_2`, etc. Note that tests with `only_matching` key in test's dict are not counted in. You can also run all the tests in one go with `TestDownload.test_YourExtractor_all`
+1. Run `python test/test_download.py TestDownload.test_YourExtractor` (note that `YourExtractor` doesn't end with `IE`). This *should fail* at first, but you can continually re-run it until you're done. If you decide to add more than one test, the tests will then be named `TestDownload.test_YourExtractor`, `TestDownload.test_YourExtractor_1`, `TestDownload.test_YourExtractor_2`, etc. Note that tests with `only_matching` key in test's dict are not counted in. You can also run all the tests in one go with `TestDownload.test_YourExtractor_all`
 1. Make sure you have atleast one test for your extractor. Even if all videos covered by the extractor are expected to be inaccessible for automated testing, tests should still be added with a `skip` parameter indicating why the particular test is disabled from running.
 1. Have a look at [`yt_dlp/extractor/common.py`](yt_dlp/extractor/common.py) for possible helper methods and a [detailed description of what your extractor should and may return](yt_dlp/extractor/common.py#L91-L426). Add tests and code for as many as you want.
 1. Make sure your code follows [yt-dlp coding conventions](#yt-dlp-coding-conventions) and check the code with [flake8](https://flake8.pycqa.org/en/latest/index.html#quickstart):
@@ -658,6 +664,10 @@ ##### Safely extract more optional metadata
 view_count = int_or_none(video.get('views'))
 ```
 
+# My pull request is labeled pending-fixes
+
+The `pending-fixes` label is added when there are changes requested to a PR. When the necessary changes are made, the label should be removed. However, despite our best efforts, it may sometimes happen that the maintainer did not see the changes or forgot to remove the label. If your PR is still marked as `pending-fixes` a few days after all requested changes have been made, feel free to ping the maintainer who labeled your issue and ask them to re-review and remove the label.
+
 
 
 
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index fd93e7df31..972af8596d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -146,7 +146,7 @@ chio0hai
 cntrl-s
 Deer-Spangle
 DEvmIb
-Grabien
+Grabien/MaximVol
 j54vc1bk
 mpeter50
 mrpapersonic
@@ -160,7 +160,7 @@ PilzAdam
 zmousm
 iw0nderhow
 unit193
-TwoThousandHedgehogs
+TwoThousandHedgehogs/KathrynElrod
 Jertzukka
 cypheron
 Hyeeji
diff --git a/Makefile b/Makefile
index b65ec9515e..b6cb27bb0b 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ pypi-files: AUTHORS Changelog.md LICENSE README.md README.txt supportedsites com
 clean-test:
 	rm -rf test/testdata/sigs/player-*.js tmp/ *.annotations.xml *.aria2 *.description *.dump *.frag \
 	*.frag.aria2 *.frag.urls *.info.json *.live_chat.json *.meta *.part* *.tmp *.temp *.unknown_video *.ytdl \
-	*.3gp *.ape *.avi *.desktop *.flac *.flv *.jpeg *.jpg *.m4a *.m4v *.mhtml *.mkv *.mov *.mp3 \
+	*.3gp *.ape *.ass *.avi *.desktop *.flac *.flv *.jpeg *.jpg *.m4a *.m4v *.mhtml *.mkv *.mov *.mp3 \
 	*.mp4 *.ogg *.opus *.png *.sbv *.srt *.swf *.swp *.ttml *.url *.vtt *.wav *.webloc *.webm *.webp
 clean-dist:
 	rm -rf yt-dlp.1.temp.md yt-dlp.1 README.txt MANIFEST build/ dist/ .coverage cover/ yt-dlp.tar.gz completions/ \
diff --git a/README.md b/README.md
index 81b5d417d0..f24693c7b3 100644
--- a/README.md
+++ b/README.md
@@ -112,7 +112,7 @@ # NEW FEATURES
 
 * **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`, `--exec` at different stages, etc
+* **Improvements**: Regex and other operators in `--format`/`--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
 
@@ -130,7 +130,7 @@ ### Differences in default behavior
 * The default [format sorting](#sorting-formats) is different from youtube-dl and prefers higher resolution and better codecs rather than higher bitrates. You can use the `--format-sort` option to change this to any order you prefer, or use `--compat-options format-sort` to use youtube-dl's sorting order
 * The default format selector is `bv*+ba/b`. This means that if a combined video + audio format that is better than the best video-only format is found, the former will be preferred. Use `-f bv+ba/b` or `--compat-options format-spec` to revert this
 * Unlike youtube-dlc, yt-dlp does not allow merging multiple audio/video streams into one file by default (since this conflicts with the use of `-f bv*+ba`). If needed, this feature must be enabled using `--audio-multistreams` and `--video-multistreams`. You can also use `--compat-options multistreams` to enable both
-* `--ignore-errors` is enabled by default. Use `--abort-on-error` or `--compat-options abort-on-error` to abort on errors instead
+* `--no-abort-on-error` is enabled by default. Use `--abort-on-error` or `--compat-options abort-on-error` to abort on errors instead
 * When writing metadata files such as thumbnails, description or infojson, the same information (if available) is also written for playlists. Use `--no-write-playlist-metafiles` or `--compat-options no-playlist-metafiles` to not write these files
 * `--add-metadata` attaches the `infojson` to `mkv` files in addition to writing the metadata when used with `--write-info-json`. Use `--no-embed-info-json` or `--compat-options no-attach-info-json` to revert this
 * Some metadata are embedded into different fields when using `--add-metadata` as compared to youtube-dl. Most notably, `comment` field contains the `webpage_url` and `synopsis` contains the `description`. You can [use `--parse-metadata`](#modifying-metadata) to modify this to your liking or use `--compat-options embed-metadata` to revert this
@@ -267,7 +267,7 @@ ## DEPENDENCIES
 * [**pycryptodomex**](https://github.com/Legrandin/pycryptodome) - For decrypting AES-128 HLS streams and various other data. Licensed under [BSD2](https://github.com/Legrandin/pycryptodome/blob/master/LICENSE.rst)
 * [**websockets**](https://github.com/aaugustin/websockets) - For downloading over websocket. Licensed under [BSD3](https://github.com/aaugustin/websockets/blob/main/LICENSE)
 * [**secretstorage**](https://github.com/mitya57/secretstorage) - For accessing the Gnome keyring while decrypting cookies of Chromium-based browsers on Linux. Licensed under [BSD](https://github.com/mitya57/secretstorage/blob/master/LICENSE)
-* [**AtomicParsley**](https://github.com/wez/atomicparsley) - For embedding thumbnail in mp4/m4a if mutagen is not present. Licensed under [GPLv2+](https://github.com/wez/atomicparsley/blob/master/COPYING)
+* [**AtomicParsley**](https://github.com/wez/atomicparsley) - For embedding thumbnail in mp4/m4a if mutagen/ffmpeg cannot. Licensed under [GPLv2+](https://github.com/wez/atomicparsley/blob/master/COPYING)
 * [**brotli**](https://github.com/google/brotli) or [**brotlicffi**](https://github.com/python-hyper/brotlicffi) - [Brotli](https://en.wikipedia.org/wiki/Brotli) content encoding support. Both licensed under MIT <sup>[1](https://github.com/google/brotli/blob/master/LICENSE) [2](https://github.com/python-hyper/brotlicffi/blob/master/LICENSE) </sup>
 * [**rtmpdump**](http://rtmpdump.mplayerhq.hu) - For downloading `rtmp` streams. ffmpeg will be used as a fallback. Licensed under [GPLv2+](http://rtmpdump.mplayerhq.hu)
 * [**mplayer**](http://mplayerhq.hu/design7/info.html) or [**mpv**](https://mpv.io) - For downloading `rstp` streams. ffmpeg will be used as a fallback. Licensed under [GPLv2+](https://github.com/mpv-player/mpv/blob/master/Copyright)
@@ -279,6 +279,7 @@ ## DEPENDENCIES
 
 The Windows and MacOS standalone release binaries are already built with the python interpreter, mutagen, pycryptodomex and websockets included.
 
+<!-- TODO: ffmpeg has merged this patch. Remove this note once there is new release -->
 **Note**: There are some regressions in newer ffmpeg versions that causes various issues when used alongside yt-dlp. Since ffmpeg is such an important dependency, we provide [custom builds](https://github.com/yt-dlp/FFmpeg-Builds#ffmpeg-static-auto-builds) with patches for these issues at [yt-dlp/FFmpeg-Builds](https://github.com/yt-dlp/FFmpeg-Builds). See [the readme](https://github.com/yt-dlp/FFmpeg-Builds#patches-applied) for details on the specific issues solved by these builds
 
 
@@ -606,11 +607,11 @@ ## Filesystem Options:
                                      --write-description etc. (default)
     --no-write-playlist-metafiles    Do not write playlist metadata when using
                                      --write-info-json, --write-description etc.
-    --clean-infojson                 Remove some private fields such as
+    --clean-info-json                Remove some private fields such as
                                      filenames from the infojson. Note that it
                                      could still contain some personal
                                      information (default)
-    --no-clean-infojson              Write all fields to the infojson
+    --no-clean-info-json             Write all fields to the infojson
     --write-comments                 Retrieve video comments to be placed in the
                                      infojson. The comments are fetched even
                                      without this option if the extraction is
@@ -1599,25 +1600,28 @@ # MODIFYING METADATA
 * You can download an additional URL based on the metadata of the currently downloaded video. To do this, set the field `additional_urls` to the URL that you want to download. Eg: `--parse-metadata "description:(?P<additional_urls>https?://www\.vimeo\.com/\d+)` will download the first vimeo video found in the description
 * You can use this to change the metadata that is embedded in the media file. To do this, set the value of the corresponding field with a `meta_` prefix. For example, any value you set to `meta_description` field will be added to the `description` field in the file. For example, you can use this to set a different "description" and "synopsis". To modify the metadata of individual streams, use the `meta<n>_` prefix (Eg: `meta1_language`). Any value set to the `meta_` field will overwrite all default values.
 
+**Note**: Metadata modification happens before format selection, post-extraction and other post-processing operations. Some fields may be added or changed during these steps, overriding your changes.
+
 For reference, these are the fields yt-dlp adds by default to the file metadata:
 
-Metadata fields|From
-:---|:---
-`title`|`track` or `title`
-`date`|`upload_date`
-`description`,  `synopsis`|`description`
-`purl`, `comment`|`webpage_url`
-`track`|`track_number`
-`artist`|`artist`, `creator`, `uploader` or `uploader_id`
-`genre`|`genre`
-`album`|`album`
-`album_artist`|`album_artist`
-`disc`|`disc_number`
-`show`|`series`
-`season_number`|`season_number`
-`episode_id`|`episode` or `episode_id`
-`episode_sort`|`episode_number`
-`language` of each stream|From the format's `language`
+Metadata fields            | From
+:--------------------------|:------------------------------------------------
+`title`                    | `track` or `title`
+`date`                     | `upload_date`
+`description`,  `synopsis` | `description`
+`purl`, `comment`          | `webpage_url`
+`track`                    | `track_number`
+`artist`                   | `artist`, `creator`, `uploader` or `uploader_id`
+`genre`                    | `genre`
+`album`                    | `album`
+`album_artist`             | `album_artist`
+`disc`                     | `disc_number`
+`show`                     | `series`
+`season_number`            | `season_number`
+`episode_id`               | `episode` or `episode_id`
+`episode_sort`             | `episode_number`
+`language` of each stream  | the format's `language`
+
 **Note**: The file format may not support some of these fields
 
 
@@ -1816,12 +1820,11 @@ # ℹ️ See docstring of yt_dlp.YoutubeDL for a description of the options
     }],
     'logger': MyLogger(),
     'progress_hooks': [my_hook],
+    # Add custom headers
+    'http_headers': {'Referer': 'https://www.google.com'}
 }
 
 
-# Add custom headers
-yt_dlp.utils.std_headers.update({'Referer': 'https://www.google.com'})
-
 # ℹ️ See the public functions in yt_dlp.YoutubeDL for for other available functions.
 # Eg: "ydl.download", "ydl.download_with_info_file"
 with yt_dlp.YoutubeDL(ydl_opts) as ydl:
diff --git a/devscripts/prepare_manpage.py b/devscripts/prepare_manpage.py
index 6612723f77..29c675f8ae 100644
--- a/devscripts/prepare_manpage.py
+++ b/devscripts/prepare_manpage.py
@@ -75,7 +75,11 @@ def filter_options(readme):
     section = re.search(r'(?sm)^# USAGE AND OPTIONS\n.+?(?=^# )', readme).group(0)
     options = '# OPTIONS\n'
     for line in section.split('\n')[1:]:
-        mobj = re.fullmatch(r'\s{4}(?P<opt>-(?:,\s|[^\s])+)(?:\s(?P<meta>([^\s]|\s(?!\s))+))?(\s{2,}(?P<desc>.+))?', line)
+        mobj = re.fullmatch(r'''(?x)
+                \s{4}(?P<opt>-(?:,\s|[^\s])+)
+                (?:\s(?P<meta>(?:[^\s]|\s(?!\s))+))?
+                (\s{2,}(?P<desc>.+))?
+            ''', line)
         if not mobj:
             options += f'{line.lstrip()}\n'
             continue
diff --git a/setup.py b/setup.py
index 3e599cd95c..98781c5dab 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
 LONG_DESCRIPTION = '\n\n'.join((
     'Official repository: <https://github.com/yt-dlp/yt-dlp>',
     '**PS**: Some links in this document will not work since this is a copy of the README.md from Github',
-    open('README.md', 'r', encoding='utf-8').read()))
+    open('README.md').read()))
 
 REQUIREMENTS = open('requirements.txt').read().splitlines()
 
diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 51a89bd237..3ee3ed7d2b 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -235,6 +235,8 @@ class YoutubeDL(object):
                        See "Sorting Formats" for more details.
     format_sort_force: Force the given format_sort. see "Sorting Formats"
                        for more details.
+    prefer_free_formats: Whether to prefer video formats with free containers
+                       over non-free ones of same quality.
     allow_multiple_video_streams:   Allow multiple video streams to be merged
                        into a single file
     allow_multiple_audio_streams:   Allow multiple audio streams to be merged
diff --git a/yt_dlp/downloader/youtube_live_chat.py b/yt_dlp/downloader/youtube_live_chat.py
index ef4205edc7..fbf1c3d5a3 100644
--- a/yt_dlp/downloader/youtube_live_chat.py
+++ b/yt_dlp/downloader/youtube_live_chat.py
@@ -22,6 +22,9 @@ class YoutubeLiveChatFD(FragmentFD):
     def real_download(self, filename, info_dict):
         video_id = info_dict['video_id']
         self.to_screen('[%s] Downloading live chat' % self.FD_NAME)
+        if not self.params.get('skip_download'):
+            self.report_warning('Live chat download runs until the livestream ends. '
+                                'If you wish to download the video simultaneously, run a separate yt-dlp instance')
 
         fragment_retries = self.params.get('fragment_retries', 0)
         test = self.params.get('test', False)
diff --git a/yt_dlp/extractor/abematv.py b/yt_dlp/extractor/abematv.py
index 66b12c72f7..360fa4699a 100644
--- a/yt_dlp/extractor/abematv.py
+++ b/yt_dlp/extractor/abematv.py
@@ -8,10 +8,6 @@
 from base64 import urlsafe_b64encode
 from binascii import unhexlify
 
-import typing
-if typing.TYPE_CHECKING:
-    from ..YoutubeDL import YoutubeDL
-
 from .common import InfoExtractor
 from ..aes import aes_ecb_decrypt
 from ..compat import (
@@ -36,15 +32,15 @@
 
 # NOTE: network handler related code is temporary thing until network stack overhaul PRs are merged (#2861/#2862)
 
-def add_opener(self: 'YoutubeDL', handler):
+def add_opener(ydl, handler):
     ''' Add a handler for opening URLs, like _download_webpage '''
     # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L426
     # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L605
-    assert isinstance(self._opener, compat_urllib_request.OpenerDirector)
-    self._opener.add_handler(handler)
+    assert isinstance(ydl._opener, compat_urllib_request.OpenerDirector)
+    ydl._opener.add_handler(handler)
 
 
-def remove_opener(self: 'YoutubeDL', handler):
+def remove_opener(ydl, handler):
     '''
     Remove handler(s) for opening URLs
     @param handler Either handler object itself or handler type.
@@ -52,8 +48,8 @@ def remove_opener(self: 'YoutubeDL', handler):
     '''
     # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L426
     # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L605
-    opener = self._opener
-    assert isinstance(self._opener, compat_urllib_request.OpenerDirector)
+    opener = ydl._opener
+    assert isinstance(ydl._opener, compat_urllib_request.OpenerDirector)
     if isinstance(handler, (type, tuple)):
         find_cp = lambda x: isinstance(x, handler)
     else:
diff --git a/yt_dlp/extractor/ant1newsgr.py b/yt_dlp/extractor/ant1newsgr.py
index 7d70e04278..1075b461ed 100644
--- a/yt_dlp/extractor/ant1newsgr.py
+++ b/yt_dlp/extractor/ant1newsgr.py
@@ -97,8 +97,8 @@ def _real_extract(self, url):
         embed_urls = list(Ant1NewsGrEmbedIE._extract_urls(webpage))
         if not embed_urls:
             raise ExtractorError('no videos found for %s' % video_id, expected=True)
-        return self.url_result_or_playlist_from_matches(
-            embed_urls, video_id, info['title'], ie=Ant1NewsGrEmbedIE.ie_key(),
+        return self.playlist_from_matches(
+            embed_urls, video_id, info.get('title'), ie=Ant1NewsGrEmbedIE.ie_key(),
             video_kwargs={'url_transparent': True, 'timestamp': info.get('timestamp')})
 
 
diff --git a/yt_dlp/extractor/common.py b/yt_dlp/extractor/common.py
index 5b7de12968..3548144330 100644
--- a/yt_dlp/extractor/common.py
+++ b/yt_dlp/extractor/common.py
@@ -226,6 +226,7 @@ class InfoExtractor(object):
 
     The following fields are optional:
 
+    direct:         True if a direct video file was given (must only be set by GenericIE)
     alt_title:      A secondary title of the video.
     display_id      An alternative identifier for the video, not necessarily
                     unique, but available before title. Typically, id is
@@ -274,7 +275,7 @@ class InfoExtractor(object):
                         * "url": A URL pointing to the subtitles file
                     It can optionally also have:
                         * "name": Name or description of the subtitles
-                        * http_headers: A dictionary of additional HTTP headers
+                        * "http_headers": A dictionary of additional HTTP headers
                                   to add to the request.
                     "ext" will be calculated from URL if missing
     automatic_captions: Like 'subtitles'; contains automatically generated
@@ -425,8 +426,8 @@ class InfoExtractor(object):
     title, description etc.
 
 
-    Subclasses of this one should re-define the _real_initialize() and
-    _real_extract() methods and define a _VALID_URL regexp.
+    Subclasses of this should define a _VALID_URL regexp and, re-define the
+    _real_extract() and (optionally) _real_initialize() methods.
     Probably, they should also be added to the list of extractors.
 
     Subclasses may also override suitable() if necessary, but ensure the function
@@ -661,7 +662,7 @@ def __maybe_fake_ip_and_retry(self, countries):
         return False
 
     def set_downloader(self, downloader):
-        """Sets the downloader for this IE."""
+        """Sets a YoutubeDL instance as the downloader for this IE."""
         self._downloader = downloader
 
     def _real_initialize(self):
@@ -670,7 +671,7 @@ def _real_initialize(self):
 
     def _real_extract(self, url):
         """Real extraction process. Redefine in subclasses."""
-        pass
+        raise NotImplementedError('This method must be implemented by subclasses')
 
     @classmethod
     def ie_key(cls):
@@ -1661,31 +1662,31 @@ class FormatSort:
             'format_id': {'type': 'alias', 'field': 'id'},
             'preference': {'type': 'alias', 'field': 'ie_pref'},
             'language_preference': {'type': 'alias', 'field': 'lang'},
+            'source_preference': {'type': 'alias', 'field': 'source'},
+            'protocol': {'type': 'alias', 'field': 'proto'},
+            'filesize_approx': {'type': 'alias', 'field': 'fs_approx'},
 
             # Deprecated
-            'dimension': {'type': 'alias', 'field': 'res'},
-            'resolution': {'type': 'alias', 'field': 'res'},
-            'extension': {'type': 'alias', 'field': 'ext'},
-            'bitrate': {'type': 'alias', 'field': 'br'},
-            'total_bitrate': {'type': 'alias', 'field': 'tbr'},
-            'video_bitrate': {'type': 'alias', 'field': 'vbr'},
-            'audio_bitrate': {'type': 'alias', 'field': 'abr'},
-            'framerate': {'type': 'alias', 'field': 'fps'},
-            'protocol': {'type': 'alias', 'field': 'proto'},
-            'source_preference': {'type': 'alias', 'field': 'source'},
-            'filesize_approx': {'type': 'alias', 'field': 'fs_approx'},
-            'filesize_estimate': {'type': 'alias', 'field': 'size'},
-            'samplerate': {'type': 'alias', 'field': 'asr'},
-            'video_ext': {'type': 'alias', 'field': 'vext'},
-            'audio_ext': {'type': 'alias', 'field': 'aext'},
-            'video_codec': {'type': 'alias', 'field': 'vcodec'},
-            'audio_codec': {'type': 'alias', 'field': 'acodec'},
-            'video': {'type': 'alias', 'field': 'hasvid'},
-            'has_video': {'type': 'alias', 'field': 'hasvid'},
-            'audio': {'type': 'alias', 'field': 'hasaud'},
-            'has_audio': {'type': 'alias', 'field': 'hasaud'},
-            'extractor': {'type': 'alias', 'field': 'ie_pref'},
-            'extractor_preference': {'type': 'alias', 'field': 'ie_pref'},
+            'dimension': {'type': 'alias', 'field': 'res', 'deprecated': True},
+            'resolution': {'type': 'alias', 'field': 'res', 'deprecated': True},
+            'extension': {'type': 'alias', 'field': 'ext', 'deprecated': True},
+            'bitrate': {'type': 'alias', 'field': 'br', 'deprecated': True},
+            'total_bitrate': {'type': 'alias', 'field': 'tbr', 'deprecated': True},
+            'video_bitrate': {'type': 'alias', 'field': 'vbr', 'deprecated': True},
+            'audio_bitrate': {'type': 'alias', 'field': 'abr', 'deprecated': True},
+            'framerate': {'type': 'alias', 'field': 'fps', 'deprecated': True},
+            'filesize_estimate': {'type': 'alias', 'field': 'size', 'deprecated': True},
+            'samplerate': {'type': 'alias', 'field': 'asr', 'deprecated': True},
+            'video_ext': {'type': 'alias', 'field': 'vext', 'deprecated': True},
+            'audio_ext': {'type': 'alias', 'field': 'aext', 'deprecated': True},
+            'video_codec': {'type': 'alias', 'field': 'vcodec', 'deprecated': True},
+            'audio_codec': {'type': 'alias', 'field': 'acodec', 'deprecated': True},
+            'video': {'type': 'alias', 'field': 'hasvid', 'deprecated': True},
+            'has_video': {'type': 'alias', 'field': 'hasvid', 'deprecated': True},
+            'audio': {'type': 'alias', 'field': 'hasaud', 'deprecated': True},
+            'has_audio': {'type': 'alias', 'field': 'hasaud', 'deprecated': True},
+            'extractor': {'type': 'alias', 'field': 'ie_pref', 'deprecated': True},
+            'extractor_preference': {'type': 'alias', 'field': 'ie_pref', 'deprecated': True},
         }
 
         def __init__(self, ie, field_preference):
@@ -1785,7 +1786,7 @@ def add_item(field, reverse, closest, limit_text):
                     continue
                 if self._get_field_setting(field, 'type') == 'alias':
                     alias, field = field, self._get_field_setting(field, 'field')
-                    if alias not in ('format_id', 'preference', 'language_preference'):
+                    if self._get_field_setting(alias, 'deprecated'):
                         self.ydl.deprecation_warning(
                             f'Format sorting alias {alias} is deprecated '
                             f'and may be removed in a future version. Please use {field} instead')
diff --git a/yt_dlp/extractor/frontendmasters.py b/yt_dlp/extractor/frontendmasters.py
index 40b8cb0b4f..0d29da29b8 100644
--- a/yt_dlp/extractor/frontendmasters.py
+++ b/yt_dlp/extractor/frontendmasters.py
@@ -252,9 +252,9 @@ def _real_extract(self, url):
         entries = []
         for lesson in lessons:
             lesson_name = lesson.get('slug')
-            if not lesson_name:
-                continue
             lesson_id = lesson.get('hash') or lesson.get('statsId')
+            if not lesson_id or not lesson_name:
+                continue
             entries.append(self._extract_lesson(chapters, lesson_id, lesson))
 
         title = course.get('title')
diff --git a/yt_dlp/extractor/iqiyi.py b/yt_dlp/extractor/iqiyi.py
index 74e20a54a1..fdcf144696 100644
--- a/yt_dlp/extractor/iqiyi.py
+++ b/yt_dlp/extractor/iqiyi.py
@@ -621,7 +621,7 @@ def _real_extract(self, url):
         preview_time = traverse_obj(
             initial_format_data, ('boss_ts', (None, 'data'), ('previewTime', 'rtime')), expected_type=float_or_none, get_all=False)
         if traverse_obj(initial_format_data, ('boss_ts', 'data', 'prv'), expected_type=int_or_none):
-            self.report_warning('This preview video is limited%s' % format_field(preview_time, template='to %s seconds'))
+            self.report_warning('This preview video is limited%s' % format_field(preview_time, template=' to %s seconds'))
 
         # TODO: Extract audio-only formats
         for bid in set(traverse_obj(initial_format_data, ('program', 'video', ..., 'bid'), expected_type=str_or_none, default=[])):
diff --git a/yt_dlp/extractor/periscope.py b/yt_dlp/extractor/periscope.py
index b93a02b7d5..1a292b8ac4 100644
--- a/yt_dlp/extractor/periscope.py
+++ b/yt_dlp/extractor/periscope.py
@@ -33,7 +33,7 @@ def _parse_broadcast_data(self, broadcast, video_id):
 
         return {
             'id': broadcast.get('id') or video_id,
-            'title': self._live_title(title) if is_live else title,
+            'title': title,
             'timestamp': parse_iso8601(broadcast.get('created_at')),
             'uploader': uploader,
             'uploader_id': broadcast.get('user_id') or broadcast.get('username'),
diff --git a/yt_dlp/extractor/soundcloud.py b/yt_dlp/extractor/soundcloud.py
index 8146b3ef55..64b8a71b6b 100644
--- a/yt_dlp/extractor/soundcloud.py
+++ b/yt_dlp/extractor/soundcloud.py
@@ -59,8 +59,16 @@ def _real_extract(self, url):
 
 
 class SoundcloudBaseIE(InfoExtractor):
+    _NETRC_MACHINE = 'soundcloud'
+
     _API_V2_BASE = 'https://api-v2.soundcloud.com/'
     _BASE_URL = 'https://soundcloud.com/'
+    _USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36'
+    _API_AUTH_QUERY_TEMPLATE = '?client_id=%s'
+    _API_AUTH_URL_PW = 'https://api-auth.soundcloud.com/web-auth/sign-in/password%s'
+    _API_VERIFY_AUTH_TOKEN = 'https://api-auth.soundcloud.com/connect/session%s'
+    _access_token = None
+    _HEADERS = {}
 
     def _store_client_id(self, client_id):
         self._downloader.cache.store('soundcloud', 'client_id', client_id)
@@ -103,14 +111,6 @@ def _real_initialize(self):
         self._CLIENT_ID = self._downloader.cache.load('soundcloud', 'client_id') or 'a3e059563d7fd3372b49b37f00a00bcf'
         self._login()
 
-    _USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36'
-    _API_AUTH_QUERY_TEMPLATE = '?client_id=%s'
-    _API_AUTH_URL_PW = 'https://api-auth.soundcloud.com/web-auth/sign-in/password%s'
-    _API_VERIFY_AUTH_TOKEN = 'https://api-auth.soundcloud.com/connect/session%s'
-    _access_token = None
-    _HEADERS = {}
-    _NETRC_MACHINE = 'soundcloud'
-
     def _login(self):
         username, password = self._get_login_info()
         if username is None:
diff --git a/yt_dlp/extractor/sovietscloset.py b/yt_dlp/extractor/sovietscloset.py
index daf1c74503..4bc2263f0c 100644
--- a/yt_dlp/extractor/sovietscloset.py
+++ b/yt_dlp/extractor/sovietscloset.py
@@ -67,6 +67,7 @@ class SovietsClosetIE(SovietsClosetBaseIE):
                 'series': 'The Witcher',
                 'season': 'Misc',
                 'episode_number': 13,
+                'episode': 'Episode 13',
             },
         },
         {
@@ -92,6 +93,7 @@ class SovietsClosetIE(SovietsClosetBaseIE):
                 'series': 'Arma 3',
                 'season': 'Zeus Games',
                 'episode_number': 3,
+                'episode': 'Episode 3',
             },
         },
     ]
diff --git a/yt_dlp/extractor/youtube.py b/yt_dlp/extractor/youtube.py
index 041815a194..6451c08c0b 100644
--- a/yt_dlp/extractor/youtube.py
+++ b/yt_dlp/extractor/youtube.py
@@ -3094,6 +3094,8 @@ def _extract_formats(self, streaming_data, video_id, player_url, is_live):
             # Some formats may have much smaller duration than others (possibly damaged during encoding)
             # Eg: 2-nOtRESiUc Ref: https://github.com/yt-dlp/yt-dlp/issues/2823
             is_damaged = try_get(fmt, lambda x: float(x['approxDurationMs']) < approx_duration - 10000)
+            if is_damaged:
+                self.report_warning(f'{video_id}: Some formats are possibly damaged. They will be deprioritized', only_once=True)
             dct = {
                 'asr': int_or_none(fmt.get('audioSampleRate')),
                 'filesize': int_or_none(fmt.get('contentLength')),
diff --git a/yt_dlp/extractor/zingmp3.py b/yt_dlp/extractor/zingmp3.py
index f84ba5cff2..22c62e22ea 100644
--- a/yt_dlp/extractor/zingmp3.py
+++ b/yt_dlp/extractor/zingmp3.py
@@ -149,7 +149,7 @@ class ZingMp3IE(ZingMp3BaseIE):
         },
     }, {
         'url': 'https://zingmp3.vn/video-clip/Suong-Hoa-Dua-Loi-K-ICM-RYO/ZO8ZF7C7.html',
-        'md5': 'e9c972b693aa88301ef981c8151c4343',
+        'md5': 'c7f23d971ac1a4f675456ed13c9b9612',
         'info_dict': {
             'id': 'ZO8ZF7C7',
             'title': 'Sương Hoa Đưa Lối',
@@ -158,6 +158,8 @@ class ZingMp3IE(ZingMp3BaseIE):
             'duration': 207,
             'track': 'Sương Hoa Đưa Lối',
             'artist': 'K-ICM, RYO',
+            'album': 'Sương Hoa Đưa Lối (Single)',
+            'album_artist': 'K-ICM, RYO',
         },
     }, {
         'url': 'https://zingmp3.vn/embed/song/ZWZEI76B?start=false',
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index f6e41f8373..d2a9303c70 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -1030,7 +1030,7 @@ def make_HTTPS_handler(params, **kwargs):
 def bug_reports_message(before=';'):
     msg = ('please report this issue on  https://github.com/yt-dlp/yt-dlp , '
            'filling out the "Broken site" issue template properly. '
-           'Confirm you are on the latest version using -U')
+           'Confirm you are on the latest version using  yt-dlp -U')
 
     before = before.rstrip()
     if not before or before.endswith(('.', '!', '?')):
@@ -5481,5 +5481,5 @@ def _cancel_all_tasks(loop):
 
 
 def merge_headers(*dicts):
-    """Merge dicts of network headers case insensitively, prioritizing the latter ones"""
+    """Merge dicts of http headers case insensitively, prioritizing the latter ones"""
     return {k.capitalize(): v for k, v in itertools.chain.from_iterable(map(dict.items, dicts))}