Revert "Fix load_torchcodec_shared_libraries on Windows (#1109)"

This reverts commit 79f985a.

Author: Dan-Flores

src/torchcodec/_core/ops.py

@@ -6,12 +6,7 @@
 
 import io
 import json
-import os
-import shutil
-import sys
 import warnings
-from contextlib import nullcontext
-from pathlib import Path
 from types import ModuleType
 from typing import List, Optional, Tuple, Union
 
@@ -27,7 +22,7 @@
 _pybind_ops: Optional[ModuleType] = None
 
 
-def load_torchcodec_shared_libraries() -> tuple[int, str]:
+def load_torchcodec_shared_libraries():
     # Successively try to load the shared libraries for each version of FFmpeg
     # that we support. We always start with the highest version, working our way
     # down to the lowest version. Once we can load ALL shared libraries for a
@@ -75,8 +70,7 @@ def load_torchcodec_shared_libraries() -> tuple[int, str]:
     raise RuntimeError(
         f"""Could not load libtorchcodec. Likely causes:
           1. FFmpeg is not properly installed in your environment. We support
-             versions 4, 5, 6, 7, and 8. On Windows, ensure you've installed
-             the "full-shared" version which ships DLLs.
+             versions 4, 5, 6, 7, and 8.
           2. The PyTorch version ({torch.__version__}) is not compatible with
              this version of TorchCodec. Refer to the version compatibility
              table:
@@ -88,21 +82,7 @@ def load_torchcodec_shared_libraries() -> tuple[int, str]:
     )
 
 
-if sys.platform == "win32" and hasattr(os, "add_dll_directory"):
-    # On windows we try to locate the FFmpeg DLLs and temporarily add them to
-    # the DLL search path. This seems to be needed on some users machine, but
-    # not on our CI. We don't know why.
-    if ffmpeg_path := shutil.which("ffmpeg"):
-
-        def cm():  # noqa: F811
-            ffmpeg_dir = Path(ffmpeg_path).parent
-            return os.add_dll_directory(str(ffmpeg_dir))  # that's the actual CM
-
-else:
-    cm = nullcontext
-
-with cm():
-    ffmpeg_major_version, core_library_path = load_torchcodec_shared_libraries()
+ffmpeg_major_version, core_library_path = load_torchcodec_shared_libraries()
 
 
 # Note: We use disallow_in_graph because PyTorch does constant propagation of