revert previous. Now add Python3_FIND_ABI and explicitly set Python3 as dependency of custom_ops target

Author: NicolasHug

src/torchcodec/_core/CMakeLists.txt

@@ -6,6 +6,10 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(PYBIND11_FINDPYTHON ON)
 find_package(pybind11 REQUIRED)
 find_package(Torch REQUIRED)
+
+if (WIN32)
+    set(Python3_FIND_ABI "ANY" "ANY" "ANY" "ANY")
+endif()
 find_package(Python3 ${PYTHON_VERSION} EXACT COMPONENTS Development)
 
 if(DEFINED TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR AND TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR)
@@ -141,6 +145,9 @@ function(make_torchcodec_libraries
         ${core_library_name}
         ${Python3_LIBRARIES}
     )
+    if (WIN32)
+        list(APPEND custom_ops_dependencies Python3::Python)
+    endif()
     make_torchcodec_sublibrary(
         "${custom_ops_library_name}"
         SHARED

src/torchcodec/_core/ops.py

@@ -13,29 +13,6 @@
 from typing import List, Optional, Tuple, Union
 
 import torch
-
-
-def _init_dll_path():
-    """Initialize DLL search paths for Windows
-    
-    On Windows Python-3.8+ has `os.add_dll_directory` call,
-    which is called to configure dll search path.
-    To find FFmpeg and other dependent dlls we need to make sure the
-    conda environment/bin path and other system paths are configured.
-    """
-    if os.name == "nt":
-        for path in os.environ.get("PATH", "").split(";"):
-            if os.path.exists(path):
-                try:
-                    os.add_dll_directory(path)
-                except Exception:
-                    # Ignore paths that can't be added
-                    pass
-
-
-# Initialize DLL paths on Windows before attempting to load libraries
-if os.name == "nt":
-    _init_dll_path()
 from torch.library import get_ctx, register_fake
 
 from torchcodec._internally_replaced_utils import (  # @manual=//pytorch/torchcodec/src:internally_replaced_utils