Update upstream source from tag 'upstream/1.21.2'

Update to upstream version '1.21.2'
with Debian dir e1311d68311ab5a6c4ef3871daa55e56eab958ba

28 files changed, 359 insertions, 161 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 994d5f0..61e343d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,24 @@
 # Changelog
 
+## 1.21.2 - 2022-04-27
+### Additions
+- [deviantart] implement `pagination` option ([#2488](https://github.com/mikf/gallery-dl/issues/2488))
+- [pixiv] implement `background` option ([#623](https://github.com/mikf/gallery-dl/issues/623), [#1124](https://github.com/mikf/gallery-dl/issues/1124), [#2495](https://github.com/mikf/gallery-dl/issues/2495))
+- [postprocessor:ugoira] report ffmpeg/mkvmerge errors ([#2487](https://github.com/mikf/gallery-dl/issues/2487))
+### Fixes
+- [cyberdrop] match cyberdrop.to URLs ([#2496](https://github.com/mikf/gallery-dl/issues/2496))
+- [e621] fix 403 errors ([#2533](https://github.com/mikf/gallery-dl/issues/2533))
+- [issuu] fix extraction ([#2483](https://github.com/mikf/gallery-dl/issues/2483))
+- [mangadex] download from available chapters despite `externalUrl` ([#2503](https://github.com/mikf/gallery-dl/issues/2503))
+- [photovogue] update domain and api endpoint ([#2494](https://github.com/mikf/gallery-dl/issues/2494))
+- [sexcom] add fallback for empty files ([#2485](https://github.com/mikf/gallery-dl/issues/2485))
+- [twitter] improve syndication video selection ([#2354](https://github.com/mikf/gallery-dl/issues/2354))
+- [twitter] fix various syndication issues ([#2499](https://github.com/mikf/gallery-dl/issues/2499), [#2354](https://github.com/mikf/gallery-dl/issues/2354))
+- [weibo] fix infinite retries for deleted accounts ([#2521](https://github.com/mikf/gallery-dl/issues/2521))
+- [vk] fix extraction ([#2512](https://github.com/mikf/gallery-dl/issues/2512))
+- [postprocessor:ugoira] use compatible paths with mkvmerge ([#2487](https://github.com/mikf/gallery-dl/issues/2487))
+- [postprocessor:ugoira] do not auto-select the `image2` demuxer ([#2492](https://github.com/mikf/gallery-dl/issues/2492))
+
 ## 1.21.1 - 2022-04-08
 ### Additions
 - [gofile] add gofile.io extractor ([#2364](https://github.com/mikf/gallery-dl/issues/2364))
diff --git a/PKG-INFO b/PKG-INFO
index c3c66f3..63c6185 100644
--- a/PKG-INFO
+++ b/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: gallery_dl
-Version: 1.21.1
+Version: 1.21.2
 Summary: Command-line program to download image galleries and collections from several image hosting sites
 Home-page: https://github.com/mikf/gallery-dl
 Author: Mike Fährmann
@@ -99,8 +99,8 @@ Standalone Executable
 Prebuilt executable files with a Python interpreter and
 required Python packages included are available for
 
-- `Windows <https://github.com/mikf/gallery-dl/releases/download/v1.21.1/gallery-dl.exe>`__
-- `Linux   <https://github.com/mikf/gallery-dl/releases/download/v1.21.1/gallery-dl.bin>`__
+- `Windows <https://github.com/mikf/gallery-dl/releases/download/v1.21.2/gallery-dl.exe>`__
+- `Linux   <https://github.com/mikf/gallery-dl/releases/download/v1.21.2/gallery-dl.bin>`__
 
 | Executables build from the latest commit can be found at
 | https://github.com/mikf/gallery-dl/actions/workflows/executables.yml
diff --git a/README.rst b/README.rst
index a9dfe11..acdf738 100644
--- a/README.rst
+++ b/README.rst
@@ -65,8 +65,8 @@ Standalone Executable
 Prebuilt executable files with a Python interpreter and
 required Python packages included are available for
 
-- `Windows <https://github.com/mikf/gallery-dl/releases/download/v1.21.1/gallery-dl.exe>`__
-- `Linux   <https://github.com/mikf/gallery-dl/releases/download/v1.21.1/gallery-dl.bin>`__
+- `Windows <https://github.com/mikf/gallery-dl/releases/download/v1.21.2/gallery-dl.exe>`__
+- `Linux   <https://github.com/mikf/gallery-dl/releases/download/v1.21.2/gallery-dl.bin>`__
 
 | Executables build from the latest commit can be found at
 | https://github.com/mikf/gallery-dl/actions/workflows/executables.yml
diff --git a/data/man/gallery-dl.1 b/data/man/gallery-dl.1
index 6e3a965..18f4d64 100644
--- a/data/man/gallery-dl.1
+++ b/data/man/gallery-dl.1
@@ -1,4 +1,4 @@
-.TH "GALLERY-DL" "1" "2022-04-08" "1.21.1" "gallery-dl Manual"
+.TH "GALLERY-DL" "1" "2022-04-27" "1.21.2" "gallery-dl Manual"
 .\" disable hyphenation
 .nh
 
diff --git a/data/man/gallery-dl.conf.5 b/data/man/gallery-dl.conf.5
index 950300e..aa998ee 100644
--- a/data/man/gallery-dl.conf.5
+++ b/data/man/gallery-dl.conf.5
@@ -1,4 +1,4 @@
-.TH "GALLERY-DL.CONF" "5" "2022-04-08" "1.21.1" "gallery-dl Manual"
+.TH "GALLERY-DL.CONF" "5" "2022-04-27" "1.21.2" "gallery-dl Manual"
 .\" disable hyphenation
 .nh
 .\" disable justification (adjust text to left margin only)
@@ -1239,6 +1239,22 @@ files if they are images and falls back to preview versions for
 everything else (archives, etc.).
 
 
+.SS extractor.deviantart.pagination
+.IP "Type:" 6
+\f[I]string\f[]
+
+.IP "Default:" 9
+\f[I]"api"\f[]
+
+.IP "Description:" 4
+Controls when to stop paginating over API results.
+
+.br
+* \f[I]"api"\f[]: Trust the API and stop when \f[I]has_more\f[] is \f[I]false\f[].
+.br
+* \f[I]"manual"\f[]: Disregard \f[I]has_more\f[] and only stop when a batch of results is empty.
+
+
 .SS extractor.deviantart.refresh-token
 .IP "Type:" 6
 \f[I]string\f[]
@@ -2021,6 +2037,17 @@ Download from video pins.
 Download user avatars.
 
 
+.SS extractor.pixiv.user.background
+.IP "Type:" 6
+\f[I]bool\f[]
+
+.IP "Default:" 9
+\f[I]false\f[]
+
+.IP "Description:" 4
+Download user background banners.
+
+
 .SS extractor.pixiv.user.metadata
 .IP "Type:" 6
 \f[I]bool\f[]
@@ -2131,6 +2158,20 @@ Controls how to handle redirects to CAPTCHA pages.
 * \f[I]"wait\f[]: Ask the user to solve the CAPTCHA and wait.
 
 
+.SS extractor.readcomiconline.quality
+.IP "Type:" 6
+\f[I]string\f[]
+
+.IP "Default:" 9
+\f[I]"auto"\f[]
+
+.IP "Description:" 4
+Sets the \f[I]quality\f[] query parameter of issue pages. (\f[I]"lq"\f[] or \f[I]"hq"\f[])
+
+\f[I]"auto"\f[] uses the quality parameter of the input URL
+or \f[I]"hq"\f[] if not present.
+
+
 .SS extractor.reddit.comments
 .IP "Type:" 6
 \f[I]integer\f[]
@@ -3674,14 +3715,13 @@ Additional FFmpeg command-line arguments.
 FFmpeg demuxer to read and process input files with. Possible values are
 
 .br
-* "\f[I]concat\f[]" (inaccurate frame timecodes)
+* "\f[I]concat\f[]" (inaccurate frame timecodes for non-uniform frame delays)
 .br
-* "\f[I]image2\f[]" (accurate timecodes, not usable on Windows)
+* "\f[I]image2\f[]" (accurate timecodes, requires nanosecond file timestamps, i.e. no Windows or macOS)
 .br
 * "mkvmerge" (accurate timecodes, only WebM or MKV, requires \f[I]mkvmerge\f[])
 
-"auto" will select mkvmerge if possible and fall back to image2 or
-concat depending on the local operating system.
+"auto" will select mkvmerge if available and fall back to concat otherwise.
 
 
 .SS ugoira.ffmpeg-location
diff --git a/gallery_dl.egg-info/PKG-INFO b/gallery_dl.egg-info/PKG-INFO
index 1c00d88..4b00b85 100644
--- a/gallery_dl.egg-info/PKG-INFO
+++ b/gallery_dl.egg-info/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: gallery-dl
-Version: 1.21.1
+Version: 1.21.2
 Summary: Command-line program to download image galleries and collections from several image hosting sites
 Home-page: https://github.com/mikf/gallery-dl
 Author: Mike Fährmann
@@ -99,8 +99,8 @@ Standalone Executable
 Prebuilt executable files with a Python interpreter and
 required Python packages included are available for
 
-- `Windows <https://github.com/mikf/gallery-dl/releases/download/v1.21.1/gallery-dl.exe>`__
-- `Linux   <https://github.com/mikf/gallery-dl/releases/download/v1.21.1/gallery-dl.bin>`__
+- `Windows <https://github.com/mikf/gallery-dl/releases/download/v1.21.2/gallery-dl.exe>`__
+- `Linux   <https://github.com/mikf/gallery-dl/releases/download/v1.21.2/gallery-dl.bin>`__
 
 | Executables build from the latest commit can be found at
 | https://github.com/mikf/gallery-dl/actions/workflows/executables.yml
diff --git a/gallery_dl/extractor/common.py b/gallery_dl/extractor/common.py
index ff49d89..abb352c 100644
--- a/gallery_dl/extractor/common.py
+++ b/gallery_dl/extractor/common.py
@@ -603,18 +603,21 @@ class BaseExtractor(Extractor):
 
     def __init__(self, match):
         if not self.category:
-            for index, group in enumerate(match.groups()):
-                if group is not None:
-                    if index:
-                        self.category, self.root = self.instances[index-1]
-                        if not self.root:
-                            self.root = text.root_from_url(match.group(0))
-                    else:
-                        self.root = group
-                        self.category = group.partition("://")[2]
-                    break
+            self._init_category(match)
         Extractor.__init__(self, match)
 
+    def _init_category(self, match):
+        for index, group in enumerate(match.groups()):
+            if group is not None:
+                if index:
+                    self.category, self.root = self.instances[index-1]
+                    if not self.root:
+                        self.root = text.root_from_url(match.group(0))
+                else:
+                    self.root = group
+                    self.category = group.partition("://")[2]
+                break
+
     @classmethod
     def update(cls, instances):
         extra_instances = config.get(("extractor",), cls.basecategory)
diff --git a/gallery_dl/extractor/cyberdrop.py b/gallery_dl/extractor/cyberdrop.py
index 6d6e192..1afaac8 100644
--- a/gallery_dl/extractor/cyberdrop.py
+++ b/gallery_dl/extractor/cyberdrop.py
@@ -10,10 +10,10 @@ from . import lolisafe
 from .. import text
 
 
-class CyberdropAlbumExtractor(lolisafe.LolisafelbumExtractor):
+class CyberdropAlbumExtractor(lolisafe.LolisafeAlbumExtractor):
     category = "cyberdrop"
     root = "https://cyberdrop.me"
-    pattern = r"(?:https?://)?(?:www\.)?cyberdrop\.me/a/([^/?#]+)"
+    pattern = r"(?:https?://)?(?:www\.)?cyberdrop\.(?:me|to)/a/([^/?#]+)"
     test = (
         # images
         ("https://cyberdrop.me/a/keKRjm4t", {
@@ -29,7 +29,7 @@ class CyberdropAlbumExtractor(lolisafe.LolisafelbumExtractor):
             },
         }),
         # videos
-        ("https://cyberdrop.me/a/l8gIAXVD", {
+        ("https://cyberdrop.to/a/l8gIAXVD", {
             "pattern": r"https://fs-\d+\.cyberdrop\.to/.*\.mp4$",
             "count": 31,
             "keyword": {
diff --git a/gallery_dl/extractor/danbooru.py b/gallery_dl/extractor/danbooru.py
index 710950a..f21817e 100644
--- a/gallery_dl/extractor/danbooru.py
+++ b/gallery_dl/extractor/danbooru.py
@@ -9,6 +9,7 @@
 """Extractors for https://danbooru.donmai.us/ and other Danbooru instances"""
 
 from .common import BaseExtractor, Message
+from ..version import __version__
 from .. import text
 import datetime
 
@@ -22,16 +23,7 @@ class DanbooruExtractor(BaseExtractor):
     per_page = 200
 
     def __init__(self, match):
-        BaseExtractor.__init__(self, match)
-
-        self.ugoira = self.config("ugoira", False)
-        self.external = self.config("external", False)
-        self.extended_metadata = self.config("metadata", False)
-
-        username, api_key = self._get_auth_info()
-        if username:
-            self.log.debug("Using HTTP Basic Auth for user '%s'", username)
-            self.session.auth = (username, api_key)
+        self._init_category(match)
 
         instance = INSTANCES.get(self.category) or {}
         iget = instance.get
@@ -43,6 +35,17 @@ class DanbooruExtractor(BaseExtractor):
         self.request_interval_min = iget("request-interval-min", 0.0)
         self._pools = iget("pools")
 
+        BaseExtractor.__init__(self, match)
+
+        self.ugoira = self.config("ugoira", False)
+        self.external = self.config("external", False)
+        self.extended_metadata = self.config("metadata", False)
+
+        username, api_key = self._get_auth_info()
+        if username:
+            self.log.debug("Using HTTP Basic Auth for user '%s'", username)
+            self.session.auth = (username, api_key)
+
     def request(self, url, **kwargs):
         kwargs["headers"] = self.headers
         return BaseExtractor.request(self, url, **kwargs)
@@ -144,7 +147,8 @@ INSTANCES = {
     "e621": {
         "root": None,
         "pattern": r"e(?:621|926)\.net",
-        "headers": {"User-Agent": "gallery-dl/1.14.0 (by mikf)"},
+        "headers": {"User-Agent": "gallery-dl/{} (by mikf)".format(
+            __version__)},
         "pools": "sort",
         "page-limit": 750,
         "per-page": 320,
diff --git a/gallery_dl/extractor/deviantart.py b/gallery_dl/extractor/deviantart.py
index fda7220..85ec0cf 100644
--- a/gallery_dl/extractor/deviantart.py
+++ b/gallery_dl/extractor/deviantart.py
@@ -417,8 +417,8 @@ class DeviantartGalleryExtractor(DeviantartExtractor):
     pattern = BASE_PATTERN + r"/gallery(?:/all|/?\?catpath=)?/?$"
     test = (
         ("https://www.deviantart.com/shimoda7/gallery/", {
-            "pattern": r"https://(api-da\.wixmp\.com/_api/download/file"
-                       r"|images-wixmp-[^.]+.wixmp.com/f/.+/.+.jpg\?token=.+)",
+            "pattern": r"https://(images-)?wixmp-[^.]+\.wixmp\.com"
+                       r"/f/.+/.+\.(jpg|png)\?token=.+",
             "count": ">= 30",
             "keyword": {
                 "allows_comments": bool,
@@ -563,7 +563,8 @@ class DeviantartStashExtractor(DeviantartExtractor):
     pattern = r"(?:https?://)?sta\.sh/([a-z0-9]+)"
     test = (
         ("https://sta.sh/022c83odnaxc", {
-            "pattern": r"https://api-da\.wixmp\.com/_api/download/file",
+            "pattern": r"https://wixmp-[^.]+\.wixmp\.com"
+                       r"/f/.+/.+\.png\?token=.+",
             "content": "057eb2f2861f6c8a96876b13cca1a4b7a408c11f",
             "count": 1,
         }),
@@ -574,7 +575,8 @@ class DeviantartStashExtractor(DeviantartExtractor):
         }),
         # downloadable, but no "content" field (#307)
         ("https://sta.sh/024t4coz16mi", {
-            "pattern": r"https://api-da\.wixmp\.com/_api/download/file",
+            "pattern": r"https://wixmp-[^.]+\.wixmp\.com"
+                       r"/f/.+/.+\.rar\?token=.+",
             "count": 1,
         }),
         # mixed folders and images (#659)
@@ -863,8 +865,9 @@ class DeviantartDeviationExtractor(DeviantartExtractor):
         }),
         (("https://www.deviantart.com/myria-moon/art/Aime-Moi-261986576"), {
             "options": (("comments", True),),
-            "pattern": r"https://api-da\.wixmp\.com/_api/download/file",
             "keyword": {"comments": list},
+            "pattern": r"https://wixmp-[^.]+\.wixmp\.com"
+                       r"/f/.+/.+\.jpg\?token=.+",
         }),
         # wixmp URL rewrite
         (("https://www.deviantart.com/citizenfresh/art/Hverarond-789295466"), {
@@ -878,8 +881,8 @@ class DeviantartDeviationExtractor(DeviantartExtractor):
         }),
         # Flash animation with GIF preview (#1731)
         ("https://www.deviantart.com/yuumei/art/Flash-Comic-214724929", {
-            "pattern": r"https://api-da\.wixmp\.com/_api/download"
-                       r"/file\?downloadToken=.+",
+            "pattern": r"https://wixmp-[^.]+\.wixmp\.com"
+                       r"/f/.+/.+\.swf\?token=.+",
             "keyword": {
                 "filename": "flash_comic_tutorial_by_yuumei-d3juatd",
                 "extension": "swf",
@@ -1015,6 +1018,7 @@ class DeviantartOAuthAPI():
 
         self.folders = extractor.config("folders", False)
         self.metadata = extractor.extra or extractor.config("metadata", False)
+        self.strategy = extractor.config("pagination")
 
         self.client_id = extractor.config("client-id")
         if self.client_id:
@@ -1306,14 +1310,20 @@ class DeviantartOAuthAPI():
                     self._folders(results)
             yield from results
 
-            if not data["has_more"]:
+            if not data["has_more"] and (
+                    self.strategy != "manual" or not results):
                 return
+
             if "next_cursor" in data:
                 params["offset"] = None
                 params["cursor"] = data["next_cursor"]
-            else:
+            elif data["next_offset"] is not None:
                 params["offset"] = data["next_offset"]
                 params["cursor"] = None
+            else:
+                if params.get("offset") is None:
+                    return
+                params["offset"] = int(params["offset"]) + len(results)
 
     def _pagination_list(self, endpoint, params, key="results"):
         result = []
diff --git a/gallery_dl/extractor/exhentai.py b/gallery_dl/extractor/exhentai.py
index c23c36f..36b89f7 100644
--- a/gallery_dl/extractor/exhentai.py
+++ b/gallery_dl/extractor/exhentai.py
@@ -122,7 +122,7 @@ class ExhentaiGalleryExtractor(ExhentaiExtractor):
                 "date": "dt:2018-03-18 20:15:00",
                 "eh_category": "Non-H",
                 "expunged": False,
-                "favorites": "20",
+                "favorites": "21",
                 "filecount": "4",
                 "filesize": 1488978,
                 "gid": 1200119,
diff --git a/gallery_dl/extractor/issuu.py b/gallery_dl/extractor/issuu.py
index 88d57e5..ae4112b 100644
--- a/gallery_dl/extractor/issuu.py
+++ b/gallery_dl/extractor/issuu.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2019-2020 Mike Fährmann
+# Copyright 2019-2022 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -9,7 +9,7 @@
 """Extractors for https://issuu.com/"""
 
 from .common import GalleryExtractor, Extractor, Message
-from .. import text, util
+from .. import text
 import json
 
 
@@ -22,33 +22,30 @@ class IssuuBase():
 class IssuuPublicationExtractor(IssuuBase, GalleryExtractor):
     """Extractor for a single publication"""
     subcategory = "publication"
-    directory_fmt = ("{category}", "{document[userName]}",
-                     "{document[originalPublishDate]} {document[title]}")
+    directory_fmt = ("{category}", "{document[username]}",
+                     "{document[date]:%Y-%m-%d} {document[title]}")
     filename_fmt = "{num:>03}.{extension}"
-    archive_fmt = "{document[id]}_{num}"
+    archive_fmt = "{document[publicationId]}_{num}"
     pattern = r"(?:https?://)?issuu\.com(/[^/?#]+/docs/[^/?#]+)"
     test = ("https://issuu.com/issuu/docs/motions-1-2019/", {
         "pattern": r"https://image.isu.pub/190916155301-\w+/jpg/page_\d+.jpg",
         "count"  : 36,
         "keyword": {
             "document": {
-                "access"        : "public",
-                "articleStories": list,
-                "contentRating" : dict,
+                "access"        : "PUBLIC",
+                "contentRating" : {
+                    "isAdsafe"  : True,
+                    "isExplicit": False,
+                    "isReviewed": True,
+                },
                 "date"          : "dt:2019-09-16 00:00:00",
                 "description"   : "re:Motions, the brand new publication by I",
-                "documentId"    : r"re:\d+-d99ec95935f15091b040cb8060f05510",
                 "documentName"  : "motions-1-2019",
-                "downloadState" : "NOT_AVAILABLE",
-                "id"            : r"re:\d+-d99ec95935f15091b040cb8060f05510",
-                "isConverting"  : False,
-                "isQuarantined" : False,
-                "lang"          : "en",
-                "language"      : "English",
+                "downloadable"  : False,
                 "pageCount"     : 36,
                 "publicationId" : "d99ec95935f15091b040cb8060f05510",
                 "title"         : "Motions by Issuu - Issue 1",
-                "userName"      : "issuu",
+                "username"      : "issuu",
             },
             "extension": "jpg",
             "filename" : r"re:page_\d+",
@@ -58,17 +55,18 @@ class IssuuPublicationExtractor(IssuuBase, GalleryExtractor):
 
     def metadata(self, page):
         data = json.loads(text.extract(
-            page, 'window.__INITIAL_STATE__ =', ';\n')[0])
+            page, '<script data-json="', '"')[0].replace("&quot;", '"'))
 
-        doc = data["document"]
-        doc["lang"] = doc["language"]
-        doc["language"] = util.code_to_language(doc["language"])
+        doc = data["initialDocumentData"]["document"]
         doc["date"] = text.parse_datetime(
-            doc["originalPublishDate"], "%Y-%m-%d")
+            doc["originalPublishDateInISOString"], "%Y-%m-%dT%H:%M:%S.%fZ")
 
         self._cnt = text.parse_int(doc["pageCount"])
-        self._tpl = "https://{}/{}/jpg/page_{{}}.jpg".format(
-            data["config"]["hosts"]["image"], doc["id"])
+        self._tpl = "https://{}/{}-{}/jpg/page_{{}}.jpg".format(
+            data["config"]["hosts"]["image"],
+            doc["revisionId"],
+            doc["publicationId"],
+        )
 
         return {"document": doc}
 
diff --git a/gallery_dl/extractor/lolisafe.py b/gallery_dl/extractor/lolisafe.py
index 43377bd..ad7cd1d 100644
--- a/gallery_dl/extractor/lolisafe.py
+++ b/gallery_dl/extractor/lolisafe.py
@@ -25,7 +25,7 @@ BASE_PATTERN = LolisafeExtractor.update({
 })
 
 
-class LolisafelbumExtractor(LolisafeExtractor):
+class LolisafeAlbumExtractor(LolisafeExtractor):
     subcategory = "album"
     pattern = BASE_PATTERN + "/a/([^/?#]+)"
     test = (
diff --git a/gallery_dl/extractor/mangadex.py b/gallery_dl/extractor/mangadex.py
index 7194757..0bc3527 100644
--- a/gallery_dl/extractor/mangadex.py
+++ b/gallery_dl/extractor/mangadex.py
@@ -104,9 +104,13 @@ class MangadexChapterExtractor(MangadexExtractor):
             "keyword": "6abcbe1e24eeb1049dc931958853cd767ee483fb",
         }),
         # MANGA Plus (#1154)
-        ("https://mangadex.org/chapter/8d50ed68-8298-4ac9-b63d-cb2aea143dd0", {
+        ("https://mangadex.org/chapter/74149a55-e7c4-44ea-8a37-98e879c1096f", {
             "exception": exception.StopExtraction,
         }),
+        # 'externalUrl', but still downloadable (#2503)
+        ("https://mangadex.org/chapter/364728a4-6909-4164-9eea-6b56354f7c78", {
+            "count": 39,
+        }),
     )
 
     def items(self):
@@ -116,7 +120,7 @@ class MangadexChapterExtractor(MangadexExtractor):
             chapter = self.api.chapter(self.uuid)
             data = self._transform(chapter)
 
-        if data.get("_external_url"):
+        if data.get("_external_url") and not data["count"]:
             raise exception.StopExtraction(
                 "Chapter %s%s is not available on MangaDex and can instead be "
                 "read on the official publisher's website at %s.",
diff --git a/gallery_dl/extractor/nijie.py b/gallery_dl/extractor/nijie.py
index 6cb7c05..90ca01d 100644
--- a/gallery_dl/extractor/nijie.py
+++ b/gallery_dl/extractor/nijie.py
@@ -1,12 +1,12 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2015-2020 Mike Fährmann
+# Copyright 2015-2022 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-"""Extract images from https://nijie.info/"""
+"""Extractors for https://nijie.info/"""
 
 from .common import Extractor, Message, AsynchronousMixin
 from .. import text, exception
@@ -151,7 +151,7 @@ class NijieIllustrationExtractor(NijieExtractor):
     pattern = BASE_PATTERN + r"/members_illust\.php\?id=(\d+)"
     test = (
         ("https://nijie.info/members_illust.php?id=44", {
-            "url": "66c4ff94c6e77c0765dd88f2d8c663055fda573e",
+            "url": "1553e5144df50a676f5947d02469299b401ad6c0",
             "keyword": {
                 "artist_id": 44,
                 "artist_name": "ED",
@@ -163,7 +163,7 @@ class NijieIllustrationExtractor(NijieExtractor):
                 "num": int,
                 "tags": list,
                 "title": str,
-                "url": r"re:https://pic.nijie.net/\d+/nijie_picture/.*jpg$",
+                "url": r"re:https://pic.nijie.net/\d+/nijie/.*jpg$",
                 "user_id": 44,
                 "user_name": "ED",
             },
@@ -223,8 +223,8 @@ class NijieImageExtractor(NijieExtractor):
     pattern = BASE_PATTERN + r"/view(?:_popup)?\.php\?id=(\d+)"
     test = (
         ("https://nijie.info/view.php?id=70720", {
-            "url": "5497f897311397dafa188521258624346a0af2a3",
-            "keyword": "fd12bca6f4402a0c996315d28c65f7914ad70c51",
+            "url": "3d654e890212ba823c9647754767336aebc0a743",
+            "keyword": "41da5d0e178b04f01fe72460185df52fadc3c91b",
             "content": "d85e3ea896ed5e4da0bca2390ad310a4df716ca6",
         }),
         ("https://nijie.info/view.php?id=70724", {
diff --git a/gallery_dl/extractor/photovogue.py b/gallery_dl/extractor/photovogue.py
index a5c788a..3c68fd5 100644
--- a/gallery_dl/extractor/photovogue.py
+++ b/gallery_dl/extractor/photovogue.py
@@ -4,12 +4,12 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-"""Extractors for https://www.vogue.it/en/photovogue/"""
+"""Extractors for https://www.vogue.com/photovogue/"""
 
 from .common import Extractor, Message
 from .. import text
 
-BASE_PATTERN = r"(?:https?://)?(?:www\.)?vogue\.it/(?:en/)?photovogue"
+BASE_PATTERN = r"(?:https?://)?(?:www\.)?vogue\.com/photovogue"
 
 
 class PhotovogueUserExtractor(Extractor):
@@ -18,10 +18,10 @@ class PhotovogueUserExtractor(Extractor):
     directory_fmt = ("{category}", "{photographer[id]} {photographer[name]}")
     filename_fmt = "{id} {title}.{extension}"
     archive_fmt = "{id}"
-    pattern = BASE_PATTERN + r"/portfolio/?\?id=(\d+)"
+    pattern = BASE_PATTERN + r"/photographers/(\d+)"
     test = (
-        ("https://www.vogue.it/en/photovogue/portfolio/?id=221252"),
-        ("https://vogue.it/photovogue/portfolio?id=221252", {
+        ("https://www.vogue.com/photovogue/photographers/221252"),
+        ("https://vogue.com/photovogue/photographers/221252", {
             "pattern": r"https://images.vogue.it/Photovogue/[^/]+_gallery.jpg",
             "keyword": {
                 "date": "type:datetime",
@@ -67,7 +67,7 @@ class PhotovogueUserExtractor(Extractor):
             yield Message.Url, url, text.nameext_from_url(url, photo)
 
     def photos(self):
-        url = "https://api.vogue.it/production/photos"
+        url = "https://api.vogue.com/production/photos"
         params = {
             "count": "50",
             "order_by": "DESC",
diff --git a/gallery_dl/extractor/pixiv.py b/gallery_dl/extractor/pixiv.py
index 8943747..a33df42 100644
--- a/gallery_dl/extractor/pixiv.py
+++ b/gallery_dl/extractor/pixiv.py
@@ -100,7 +100,7 @@ class PixivExtractor(Extractor):
 
 
 class PixivUserExtractor(PixivExtractor):
-    """Extractor for works of a pixiv-user"""
+    """Extractor for works of a pixiv user"""
     subcategory = "user"
     pattern = (r"(?:https?://)?(?:www\.|touch\.)?pixiv\.net/(?:"
                r"(?:en/)?users/(\d+)(?:/(?:artworks|illustrations|manga)"
@@ -120,12 +120,18 @@ class PixivUserExtractor(PixivExtractor):
           "&tag=%E6%89%8B%E3%81%B6%E3%82%8D"), {
             "url": "25b1cd81153a8ff82eec440dd9f20a4a22079658",
         }),
-        # avatar (#595, 623)
+        # avatar (#595, #623, #1124)
         ("https://www.pixiv.net/en/users/173530", {
             "options": (("avatar", True),),
             "content": "4e57544480cc2036ea9608103e8f024fa737fe66",
             "range": "1",
         }),
+        # background (#623, #1124, #2495)
+        ("https://www.pixiv.net/en/users/194921", {
+            "options": (("background", True),),
+            "content": "aeda3536003ea3002f70657cb93c5053f26f5843",
+            "range": "1",
+        }),
         # deleted account
         ("http://www.pixiv.net/member_illust.php?id=173531", {
             "options": (("metadata", True),),
@@ -154,7 +160,7 @@ class PixivUserExtractor(PixivExtractor):
 
     def metadata(self):
         if self.config("metadata"):
-            return {"user": self.api.user_detail(self.user_id)}
+            return {"user": self.api.user_detail(self.user_id)["user"]}
         return {}
 
     def works(self):
@@ -167,29 +173,55 @@ class PixivUserExtractor(PixivExtractor):
                 if tag in [t["name"].lower() for t in work["tags"]]
             )
 
-        if self.config("avatar"):
-            user = self.api.user_detail(self.user_id)
-            url = user["profile_image_urls"]["medium"].replace("_170.", ".")
-            avatar = {
-                "create_date"     : None,
-                "height"          : 0,
-                "id"              : "avatar",
-                "image_urls"      : None,
-                "meta_pages"      : (),
-                "meta_single_page": {"original_image_url": url},
-                "page_count"      : 1,
-                "sanity_level"    : 0,
-                "tags"            : (),
-                "title"           : "avatar",
-                "type"            : "avatar",
-                "user"            : user,
-                "width"           : 0,
-                "x_restrict"      : 0,
-            }
-            works = itertools.chain((avatar,), works)
+        avatar = self.config("avatar")
+        background = self.config("background")
+        if avatar or background:
+            work_list = []
+            detail = self.api.user_detail(self.user_id)
+            user = detail["user"]
+
+            if avatar:
+                url = user["profile_image_urls"]["medium"]
+                work_list.append((self._make_work(
+                    "avatar", url.replace("_170.", "."), user),))
+
+            if background:
+                url = detail["profile"]["background_image_url"]
+                if url:
+                    if "/c/" in url:
+                        parts = url.split("/")
+                        del parts[3:5]
+                        url = "/".join(parts)
+                    url = url.replace("_master1200.", ".")
+                    work = self._make_work("background", url, user)
+                    if url.endswith(".jpg"):
+                        work["_fallback"] = (url[:-4] + ".png",)
+                    work_list.append((work,))
+
+            work_list.append(works)
+            works = itertools.chain.from_iterable(work_list)
 
         return works
 
+    @staticmethod
+    def _make_work(kind, url, user):
+        return {
+            "create_date"     : None,
+            "height"          : 0,
+            "id"              : kind,
+            "image_urls"      : None,
+            "meta_pages"      : (),
+            "meta_single_page": {"original_image_url": url},
+            "page_count"      : 1,
+            "sanity_level"    : 0,
+            "tags"            : (),
+            "title"           : kind,
+            "type"            : kind,
+            "user"            : user,
+            "width"           : 0,
+            "x_restrict"      : 0,
+        }
+
 
 class PixivMeExtractor(PixivExtractor):
     """Extractor for pixiv.me URLs"""
@@ -350,7 +382,7 @@ class PixivFavoriteExtractor(PixivExtractor):
 
     def metadata(self):
         if self.user_id:
-            user = self.api.user_detail(self.user_id)
+            user = self.api.user_detail(self.user_id)["user"]
         else:
             self.api.login()
             user = self.api.user
@@ -730,7 +762,7 @@ class PixivAppAPI():
 
     def user_detail(self, user_id):
         params = {"user_id": user_id}
-        return self._call("v1/user/detail", params)["user"]
+        return self._call("v1/user/detail", params)
 
     def user_following(self, user_id, restrict="public"):
         params = {"user_id": user_id, "restrict": restrict}
diff --git a/gallery_dl/extractor/readcomiconline.py b/gallery_dl/extractor/readcomiconline.py
index e4075a2..c8b8c9a 100644
--- a/gallery_dl/extractor/readcomiconline.py
+++ b/gallery_dl/extractor/readcomiconline.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2016-2021 Mike Fährmann
+# Copyright 2016-2022 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -10,6 +10,7 @@
 
 from .common import Extractor, ChapterExtractor, MangaExtractor
 from .. import text, exception
+import binascii
 import re
 
 BASE_PATTERN = r"(?i)(?:https?://)?(?:www\.)?readcomiconline\.(?:li|to)"
@@ -22,6 +23,7 @@ class ReadcomiconlineBase():
     filename_fmt = "{comic}_{issue:>03}_{page:>03}.{extension}"
     archive_fmt = "{issue_id}_{page}"
     root = "https://readcomiconline.li"
+    browser = "firefox"
 
     def request(self, url, **kwargs):
         """Detect and handle redirects to CAPTCHA pages"""
@@ -46,7 +48,7 @@ class ReadcomiconlineBase():
 class ReadcomiconlineIssueExtractor(ReadcomiconlineBase, ChapterExtractor):
     """Extractor for comic-issues from readcomiconline.li"""
     subcategory = "issue"
-    pattern = BASE_PATTERN + r"(/Comic/[^/?#]+/[^/?#]+\?id=(\d+))"
+    pattern = BASE_PATTERN + r"(/Comic/[^/?#]+/[^/?#]+\?)([^#]+)"
     test = ("https://readcomiconline.li/Comic/W-i-t-c-h/Issue-130?id=22289", {
         "url": "30d29c5afc65043bfd384c010257ec2d0ecbafa6",
         "keyword": "2d9ec81ce1b11fac06ebf96ce33cdbfca0e85eb5",
@@ -54,8 +56,18 @@ class ReadcomiconlineIssueExtractor(ReadcomiconlineBase, ChapterExtractor):
 
     def __init__(self, match):
         ChapterExtractor.__init__(self, match)
-        self.gallery_url += "&quality=hq"
-        self.issue_id = match.group(2)
+
+        params = text.parse_query(match.group(2))
+        quality = self.config("quality")
+
+        if quality is None or quality == "auto":
+            if "quality" not in params:
+                params["quality"] = "hq"
+        else:
+            params["quality"] = str(quality)
+
+        self.gallery_url += "&".join(k + "=" + v for k, v in params.items())
+        self.issue_id = params.get("id")
 
     def metadata(self, page):
         comic, pos = text.extract(page, "   - Read\r\n    ", "\r\n")
@@ -71,7 +83,7 @@ class ReadcomiconlineIssueExtractor(ReadcomiconlineBase, ChapterExtractor):
 
     def images(self, page):
         return [
-            (url, None)
+            (beau(url), None)
             for url in text.extract_iter(
                 page, 'lstImages.push("', '"'
             )
@@ -114,3 +126,18 @@ class ReadcomiconlineComicExtractor(ReadcomiconlineBase, MangaExtractor):
                 "lang": "en", "language": "English",
             }))
         return results
+
+
+def beau(url):
+    """https://readcomiconline.li/Scripts/rguard.min.js?v=1.1"""
+    if url.startswith("https"):
+        return url
+
+    containsS0 = "=s0" in url
+    url = url[:-3 if containsS0 else -6]
+    url = url[4:22] + url[25:]
+    url = url[0:-6] + url[-2:]
+    url = binascii.a2b_base64(url).decode()
+    url = url[0:13] + url[17:]
+    url = url[0:-2] + ("=s0" if containsS0 else "=s1600")
+    return "https://2.bp.blogspot.com/" + url
diff --git a/gallery_dl/extractor/sexcom.py b/gallery_dl/extractor/sexcom.py
index edf35da..830274a 100644
--- a/gallery_dl/extractor/sexcom.py
+++ b/gallery_dl/extractor/sexcom.py
@@ -87,7 +87,10 @@ class SexcomExtractor(Extractor):
                 data["extension"] = None
                 data["url"] = "ytdl:" + src
         else:
-            data["url"] = text.unescape(extr(' src="', '"').partition("?")[0])
+            data["_http_validate"] = _check_empty
+            url = text.unescape(extr(' src="', '"'))
+            data["url"] = url.partition("?")[0]
+            data["_fallback"] = (url,)
             text.nameext_from_url(data["url"], data)
 
         data["uploader"] = extr('itemprop="author">', '<')
@@ -247,3 +250,7 @@ class SexcomSearchExtractor(SexcomExtractor):
     def pins(self):
         url = "{}/{}".format(self.root, self.path)
         return self._pagination(url)
+
+
+def _check_empty(response):
+    return response.headers.get("content-length") != "0"
diff --git a/gallery_dl/extractor/twitter.py b/gallery_dl/extractor/twitter.py
index 4c46170..4c947e7 100644
--- a/gallery_dl/extractor/twitter.py
+++ b/gallery_dl/extractor/twitter.py
@@ -1291,10 +1291,21 @@ class TwitterAPI():
 
         tweet["user"]["description"] = ""
         tweet["user"]["entities"] = {"description": {}}
+        tweet["user_id_str"] = tweet["user"]["id_str"]
+
+        if tweet["id_str"] != tweet_id:
+            tweet["retweeted_status_id_str"] = tweet["id_str"]
+            tweet["id_str"] = retweet_id = tweet_id
+        else:
+            retweet_id = None
 
         if "video" in tweet:
             video = tweet["video"]
-            del video["variants"][:-1]
+            video["variants"] = (max(
+                (v for v in video["variants"] if v["type"] == "video/mp4"),
+                key=lambda v: text.parse_int(
+                    v["src"].split("/")[-2].partition("x")[0])
+            ),)
             video["variants"][0]["url"] = video["variants"][0]["src"]
             tweet["extended_entities"] = {"media": [{
                 "video_info"   : video,
@@ -1313,4 +1324,5 @@ class TwitterAPI():
             "rest_id": tweet["id_str"],
             "legacy" : tweet,
             "user"   : tweet["user"],
+            "_retweet_id_str": retweet_id,
         }
diff --git a/gallery_dl/extractor/unsplash.py b/gallery_dl/extractor/unsplash.py
index 6036322..ad1617c 100644
--- a/gallery_dl/extractor/unsplash.py
+++ b/gallery_dl/extractor/unsplash.py
@@ -115,9 +115,9 @@ class UnsplashImageExtractor(UnsplashExtractor):
                 "id": "uMJXuywXLiU",
                 "instagram_username": "just_midwest_rock",
                 "last_name": "Hoefler",
-                "location": "Madison, WI",
+                "location": None,
                 "name": "Dave Hoefler",
-                "portfolio_url": str,
+                "portfolio_url": None,
                 "total_collections": int,
                 "total_likes": int,
                 "total_photos": int,
diff --git a/gallery_dl/extractor/vk.py b/gallery_dl/extractor/vk.py
index dd2eb4e..8fb9bbf 100644
--- a/gallery_dl/extractor/vk.py
+++ b/gallery_dl/extractor/vk.py
@@ -10,7 +10,6 @@
 
 from .common import Extractor, Message
 from .. import text
-import re
 
 BASE_PATTERN = r"(?:https://)?(?:www\.|m\.)?vk\.com"
 
@@ -25,47 +24,63 @@ class VkExtractor(Extractor):
     request_interval = 1.0
 
     def items(self):
+        sizes = "wzyxrqpo"
+
         data = self.metadata()
         yield Message.Directory, data
+
         for photo in self.photos():
+
+            for size in sizes:
+                size += "_"
+                if size in photo:
+                    break
+            else:
+                self.log.warning("no photo URL found (%s)", photo.get("id"))
+                continue
+
             photo.update(data)
-            yield Message.Url, photo["url"], photo
+            photo["url"], photo["width"], photo["height"] = photo[size]
+            photo["id"] = photo["id"].rpartition("_")[2]
 
-    def _pagination(self, photos_url, user_id):
-        sub = re.compile(r"/imp[fg]/").sub
-        needle = 'data-id="{}_'.format(user_id)
+            text.nameext_from_url(photo["url"], photo)
+            yield Message.Url, photo["url"], photo
 
+    def _pagination(self, photos_id):
+        url = self.root + "/al_photos.php"
         headers = {
             "X-Requested-With": "XMLHttpRequest",
             "Origin"          : self.root,
-            "Referer"         : photos_url,
+            "Referer"         : self.root + "/" + photos_id,
         }
-        params = {
-            "al"    : "1",
-            "al_ad" : "0",
-            "offset": 0,
-            "part"  : "1",
+        data = {
+            "act"      : "show",
+            "al"       : "1",
+            "direction": "1",
+            "list"     : photos_id,
+            "offset"   : 0,
         }
 
         while True:
             payload = self.request(
-                photos_url, method="POST", headers=headers, data=params
+                url, method="POST", headers=headers, data=data,
             ).json()["payload"][1]
 
-            offset = payload[0]
-            html = payload[1]
+            total = payload[1]
+            photos = payload[3]
 
-            cnt = 0
-            for photo in text.extract_iter(html, needle, ')'):
-                cnt += 1
-                pid = photo[:photo.find('"')]
-                url = photo[photo.rindex("(")+1:]
-                url = sub("/", url.partition("?")[0])
-                yield text.nameext_from_url(url, {"url": url, "id": pid})
+            data["offset"] += len(photos)
+            if data["offset"] >= total:
+                # the last chunk of photos also contains the first few photos
+                # again if 'total' is not a multiple of 10
+                extra = total - data["offset"]
+                if extra:
+                    del photos[extra:]
 
-            if cnt <= 20 or offset == params["offset"]:
+                yield from photos
                 return
-            params["offset"] = offset
+
+            yield from photos
 
 
 class VkPhotosExtractor(VkExtractor):
@@ -76,8 +91,8 @@ class VkPhotosExtractor(VkExtractor):
                r"|(?!album-?\d+_)([^/?#]+))")
     test = (
         ("https://vk.com/id398982326", {
-            "pattern": r"https://sun\d+-\d+\.userapi\.com/sun\d+-\d+"
-                       r"/c\d+/v\d+/[0-9a-f]+/[\w-]+\.jpg",
+            "pattern": r"https://sun\d+-\d+\.userapi\.com/s/v1/if1"
+                       r"/[\w-]+\.jpg\?size=\d+x\d+&quality=96&type=album",
             "count": ">= 35",
             "keywords": {
                 "id": r"re:\d+",
@@ -90,7 +105,7 @@ class VkPhotosExtractor(VkExtractor):
             },
         }),
         ("https://vk.com/cosplayinrussia", {
-            "range": "75-100",
+            "range": "25-35",
             "keywords": {
                 "id": r"re:\d+",
                 "user": {
@@ -112,8 +127,7 @@ class VkPhotosExtractor(VkExtractor):
         self.user_id, self.user_name = match.groups()
 
     def photos(self):
-        url = "{}/photos{}".format(self.root, self.user_id)
-        return self._pagination(url, self.user_id)
+        return self._pagination("photos" + self.user_id)
 
     def metadata(self):
         if self.user_id:
@@ -146,8 +160,8 @@ class VkAlbumExtractor(VkExtractor):
     directory_fmt = ("{category}", "{user[id]}", "{album[id]}")
     pattern = BASE_PATTERN + r"/album(-?\d+)_(\d+)$"
     test = (
-        ("https://vk.com/album221469416_0", {
-            "count": 3,
+        ("https://vk.com/album232175027_00", {
+            "count": 8,
         }),
         ("https://vk.com/album-165740836_281339889", {
             "count": 12,
@@ -159,8 +173,8 @@ class VkAlbumExtractor(VkExtractor):
         self.user_id, self.album_id = match.groups()
 
     def photos(self):
-        url = "{}/album{}_{}".format(self.root, self.user_id, self.album_id)
-        return self._pagination(url, self.user_id)
+        return self._pagination("album{}_{}".format(
+            self.user_id, self.album_id))
 
     def metadata(self):
         return {
diff --git a/gallery_dl/extractor/weibo.py b/gallery_dl/extractor/weibo.py
index 81ca87f..1929f98 100644
--- a/gallery_dl/extractor/weibo.py
+++ b/gallery_dl/extractor/weibo.py
@@ -105,6 +105,10 @@ class WeiboUserExtractor(WeiboExtractor):
         ("https://m.weibo.cn/u/2314621010", {
             "range": "1-30",
         }),
+        # deleted (#2521)
+        ("https://weibo.com/u/7500315942", {
+            "count": 0,
+        }),
         ("https://m.weibo.cn/profile/2314621010"),
         ("https://m.weibo.cn/p/2304132314621010_-_WEIBO_SECOND_PROFILE_WEIBO"),
         ("https://www.weibo.com/p/1003062314621010/home"),
@@ -132,14 +136,24 @@ class WeiboUserExtractor(WeiboExtractor):
         while True:
             response = self.request(url, params=params, headers=headers)
             headers["X-XSRF-TOKEN"] = response.cookies.get("XSRF-TOKEN")
-            data = response.json()["data"]
 
+            data = response.json()
+            if not data.get("ok"):
+                self.log.debug(response.content)
+                if "since_id" not in params:  # first iteration
+                    raise exception.StopExtraction(
+                        '"%s"', data.get("msg") or "unknown error")
+
+            data = data["data"]
             for card in data["cards"]:
                 if "mblog" in card:
                     yield card["mblog"]
 
             info = data.get("cardlistInfo")
             if not info:
+                # occasionally weibo returns an empty response
+                # repeating the same request usually/eventually yields
+                # the correct response.
                 continue
 
             params["since_id"] = sid = info.get("since_id")
diff --git a/gallery_dl/extractor/wikiart.py b/gallery_dl/extractor/wikiart.py
index 05f27f1..0e06858 100644
--- a/gallery_dl/extractor/wikiart.py
+++ b/gallery_dl/extractor/wikiart.py
@@ -70,8 +70,8 @@ class WikiartArtistExtractor(WikiartExtractor):
     directory_fmt = ("{category}", "{artist[artistName]}")
     pattern = BASE_PATTERN + r"/(?!\w+-by-)([\w-]+)/?$"
     test = ("https://www.wikiart.org/en/thomas-cole", {
-        "url": "8514d743382720e6fdab7c9a73faf9e1ec940cfb",
-        "keyword": "58037afba35bfd7b4101c2316975a75d4ee92a68",
+        "url": "6844f207a5063c499fc1d5651b03127bc4fe2f73",
+        "keyword": "09230b5f504697119e267349bf92487e657a7384",
     })
 
     def __init__(self, match):
diff --git a/gallery_dl/postprocessor/ugoira.py b/gallery_dl/postprocessor/ugoira.py
index c5477d2..fb57e84 100644
--- a/gallery_dl/postprocessor/ugoira.py
+++ b/gallery_dl/postprocessor/ugoira.py
@@ -49,7 +49,7 @@ class UgoiraPP(PostProcessor):
                     mkvmerge or shutil.which("mkvmerge")):
                 demuxer = "mkvmerge"
             else:
-                demuxer = "concat" if util.WINDOWS else "image2"
+                demuxer = "concat"
 
         if demuxer == "mkvmerge":
             self._process = self._process_mkvmerge
@@ -137,6 +137,8 @@ class UgoiraPP(PostProcessor):
                 self.log.error("Unable to invoke FFmpeg (%s: %s)",
                                exc.__class__.__name__, exc)
                 pathfmt.realpath = pathfmt.temppath
+            except Exception:
+                pathfmt.realpath = pathfmt.temppath
             else:
                 if self.mtime:
                     mtime = pathfmt.kwdict.get("_mtime")
@@ -150,7 +152,13 @@ class UgoiraPP(PostProcessor):
     def _exec(self, args):
         self.log.debug(args)
         out = None if self.output else subprocess.DEVNULL
-        return subprocess.Popen(args, stdout=out, stderr=out).wait()
+        retcode = subprocess.Popen(args, stdout=out, stderr=out).wait()
+        if retcode:
+            print()
+            self.log.error("Non-zero exit status when running %s (%s)",
+                           args, retcode)
+            raise ValueError()
+        return retcode
 
     def _process_concat(self, pathfmt, tempdir):
         rate_in, rate_out = self.calculate_framerate(self._frames)
@@ -215,7 +223,7 @@ class UgoiraPP(PostProcessor):
     def _finalize_mkvmerge(self, pathfmt, tempdir):
         args = [
             self.mkvmerge,
-            "-o", self._realpath,
+            "-o", pathfmt.path,  # mkvmerge does not support "raw" paths
             "--timecodes", "0:" + self._write_mkvmerge_timecodes(tempdir),
         ]
         if self.extension == "webm":
diff --git a/gallery_dl/util.py b/gallery_dl/util.py
index e8af358..4bb220a 100644
--- a/gallery_dl/util.py
+++ b/gallery_dl/util.py
@@ -461,6 +461,8 @@ def compile_expression(expr, name="<expr>", globals=GLOBALS):
 
 def build_duration_func(duration, min=0.0):
     if not duration:
+        if min:
+            return lambda: min
         return None
 
     if isinstance(duration, str):
diff --git a/gallery_dl/version.py b/gallery_dl/version.py
index fe9a0f8..624f288 100644
--- a/gallery_dl/version.py
+++ b/gallery_dl/version.py
@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.21.1"
+__version__ = "1.21.2"
diff --git a/test/test_util.py b/test/test_util.py
index 3cf3d68..c269c9e 100644
--- a/test/test_util.py
+++ b/test/test_util.py
@@ -385,8 +385,6 @@ class TestOther(unittest.TestCase):
             expr()
 
     def test_build_duration_func(self, f=util.build_duration_func):
-        for v in (0, 0.0, "", None, (), []):
-            self.assertIsNone(f(v))
 
         def test_single(df, v):
             for _ in range(10):
@@ -398,6 +396,12 @@ class TestOther(unittest.TestCase):
                 self.assertGreaterEqual(v, lower)
                 self.assertLessEqual(v, upper)
 
+        for v in (0, 0.0, "", None, (), []):
+            self.assertIsNone(f(v))
+
+        for v in (0, 0.0, "", None, (), []):
+            test_single(f(v, 1.0), 1.0)
+
         test_single(f(3), 3)
         test_single(f(3.0), 3.0)
         test_single(f("3"), 3)