Problems with .webp files

edit

try a : print cv2.getBuildInformation() . you should see something similar to:

  Media I/O:
    ZLib:                        build (ver 1.2.8)
    JPEG:                        build (ver 90)
    WEBP:                        build (ver 0.3.1)
    PNG:                         build (ver 1.5.12)
    TIFF:                        build (ver 42 - 4.0.2)
    JPEG 2000:                   NO
    OpenEXR:                     NO
    GDAL:                        NO

if it says, WEBP NO, it means, your cv2.pyd was build without support for it. (it's one of the 3rdParty libs, that have to be enabled during build)

(oh, and btw, avoid anything from deprecated cv2.cv. it will be gone in the next version)

sorry, can't help you with installers of any kind.

i guess, you will have to build from src in that case.