[Python] OpenCV 4.1.2 - DLL Load Error: "The specified procedure could not be found" when...

I followed this official OpenCV tutorial to build OpenCV 4.1.2 with GStreamer support on Windows 11 (64-bit). Build and install were successful, but importing cv2 fails with:

ImportError: DLL load failed while importing cv2: The specified procedure could not be found.


To isolate the problem, I:

• Copied cv2.pyd into a clean test folder
• Added all missing opencv_*.dll files (version 4120) into that same folder.
• Wrote a test script that adds the DLL folders using os.add_dll_directory() and sets up the environment.
• Used Process Monitor to trace loaded DLLs — some were missing, I added them all.
• Verified with Dependencies.exe that cv2.pyd successfully loads all DLLs — no red entries.

Yet, the same import error persists.

script I used to test:

import os, sys

dll_dir = os.path.dirname(__file__)
os.add_dll_directory(dll_dir)
os.environ["PATH"] = dll_dir + os.pathsep + os.environ["PATH"]
sys.path.insert(0, dll_dir)

import cv2
print(cv2.getBuildInformation())


I also uploaded a screensht of dependencies.exe on cv2.pyd and LogFile.csv of procmon. Thanks in advance guys.

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