load plugins in youtubedl if they haven't already

test/test_YoutubeDL.py

@@ -6,6 +6,8 @@ import sys
 import unittest
 from unittest.mock import patch
 
+from yt_dlp._globals import ALL_PLUGINS_LOADED
+
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 
@@ -1396,6 +1398,12 @@ class TestYoutubeDL(unittest.TestCase):
         self.assertFalse(result.get('cookies'), msg='Cookies set in cookies field for wrong domain')
         self.assertFalse(ydl.cookiejar.get_cookie_header(fmt['url']), msg='Cookies set in cookiejar for wrong domain')
 
+    def test_load_plugins_compat(self):
+        # Should try to reload plugins if they haven't already been loaded
+        ALL_PLUGINS_LOADED.set(False)
+        FakeYDL().close()
+        assert ALL_PLUGINS_LOADED.get()
+
 
 if __name__ == '__main__':
     unittest.main()

yt_dlp/YoutubeDL.py

@@ -38,7 +38,7 @@ from ._globals import (
     LAZY_EXTRACTORS,
     plugin_ies,
     plugin_overrides,
-    plugin_pps,
+    plugin_pps, ALL_PLUGINS_LOADED,
 )
 from .minicurses import format_text
 from .networking import HEADRequest, Request, RequestDirector
@@ -51,7 +51,7 @@ from .networking.exceptions import (
     network_exceptions,
 )
 from .networking.impersonate import ImpersonateRequestHandler
-from .plugins import directories as plugin_directories
+from .plugins import directories as plugin_directories, load_all_plugin_types
 from .postprocessor import (
     EmbedThumbnailPP,
     FFmpegFixupDuplicateMoovPP,
@@ -645,6 +645,10 @@ class YoutubeDL:
         self.cache = Cache(self)
         self.__header_cookies = []
 
+        # compat for API: load plugins if they have not already
+        if not ALL_PLUGINS_LOADED.get():
+            load_all_plugin_types()
+
         stdout = sys.stderr if self.params.get('logtostderr') else sys.stdout
         self._out_files = Namespace(
             out=stdout,

yt_dlp/_globals.py

@@ -9,6 +9,9 @@ IN_CLI = ContextVar('IN_CLI', default=False)
 # `False`=force, `None`=disabled, `True`=enabled
 LAZY_EXTRACTORS = ContextVar('LAZY_EXTRACTORS', default=False)
 
+# Whether plugins have been loaded once
+ALL_PLUGINS_LOADED = ContextVar('PLUGINS_LOADED', default=False)
+
 # `...`=search default plugin dirs
 plugin_dirs = ContextVar('plugin_dirs', default=(..., ))
 plugin_ies = ContextVar('plugin_ies', default={})

yt_dlp/plugins.py

@@ -22,7 +22,7 @@ from ._globals import (
     plugin_dirs,
     plugin_ies,
     plugin_pps,
-    postprocessors, plugin_overrides,
+    postprocessors, plugin_overrides, ALL_PLUGINS_LOADED,
 )
 
 from .compat import functools  # isort: split
@@ -297,6 +297,7 @@ def load_plugins(plugin_type: PluginType):
 def load_all_plugin_types():
     for plugin_type in PluginType:
         load_plugins(plugin_type)
+    ALL_PLUGINS_LOADED.set(True)
 
 
 sys.meta_path.insert(0, PluginFinder(f'{PACKAGE_NAME}.extractor', f'{PACKAGE_NAME}.postprocessor'))