[compat] Add functools.cached_property

yt_dlp/downloader/common.py

@@ -11,6 +11,7 @@ from ..minicurses import (
     MultilinePrinter,
     QuietMultilinePrinter,
 )
+from ..compat import functools
 from ..utils import (
     NUMBER_RE,
     LockingUnsupportedError,
@@ -102,7 +103,7 @@ class FileDownloader:
 
     __to_screen = to_screen
 
-    @property
+    @functools.cached_property
     def FD_NAME(self):
         return re.sub(r'(?<!^)(?=[A-Z])', '_', type(self).__name__[:-2]).lower()
 

yt_dlp/downloader/external.py

@@ -5,6 +5,7 @@ import sys
 import time
 
 from .fragment import FragmentFD
+from ..compat import functools
 from ..compat import compat_setenv, compat_str
 from ..postprocessor.ffmpeg import EXT_TO_OUT_FORMATS, FFmpegPostProcessor
 from ..utils import (
@@ -74,7 +75,7 @@ class ExternalFD(FragmentFD):
     def EXE_NAME(cls):
         return cls.get_basename()
 
-    @property
+    @functools.cached_property
     def exe(self):
         return self.EXE_NAME