I downloaded the widevinecdm.dll
file from Chrome, then in my .pro file in QT i enabled propietary codecs as said here i added also the path to the dll like this QTWEBENGINE_CHROMIUM_FLAGS=--widevine-path="C:\Users\FRANC\OneDrive\Desktop\Programacion\Proyectos\C++\widevinecdm.dll"
but i still can't play netflix or any streaming service. any ideas?
This problem was solved after building QtWebEngine with proprietary codecs enabled.