ImportError: DLL load fails on Windows10 install. MFPlat.dll MF.dll

[nzjrs]

Please close (or add a note to the README).

I encountered a missing DLL error and the root cause was missing MFPlat.dll and friends. Exactly like #181 (comment)

FYI / For Google.

The page to visit to determine "which version of the media features pack should I download" is

https://support.microsoft.com/en-us/help/3145500/media-feature-pack-list-for-windows-n-editions

It would be cool if you offered / built without the MSMF (media features). -D WITH_MSMF=no as this seems to be / was recently bugged opencv/opencv#11696 and opencv/opencv#11810 in 3.4 and above.

According to opencv/opencv#11882 the priority is MSMF, DSHOW, VFW. Of those I think DSHOW has the least dependencies so maybe building with only that backend is sufficient on windows - but that might actually work worse for people where they have MF installed and an opecv version without a buggy MSMF backend.

In all cases it would be worth mentioning "Please install https://github.com/lucasg/Dependencies and open cv2.pyd to debug missing DLL issues."

[skvark]

I will have a look at those MSMF issues and add a note to the README.

[nzjrs]

Thanks. I learned that their is an entire version of Windows that misses these DLLs

https://www.google.com/amp/s/www.howtogeek.com/322112/what-is-an-n-or-kn-edition-of-windows/amp/

The current builds which require MSMF Will therefore always fail on this "Windows N"

[multiOTP]

I had the same issue. You can easily fix it by freely downloading the Media Pack for Windows 10 here : https://www.microsoft.com/en-us/software-download/mediafeaturepack

[skvark]

There is now a note in the README about this.

DSHOW can be forced via environment variable: OPENCV_VIDEOIO_PRIORITY_LIST=DSHOW

I'm keeping the builds as is to avoid any further issues.