When running on a Linux system that is on OpenSSL 3 (and no 1.1 libraries are installed or even available) qtmultimedia ffmpeg backend fails to load ssl libraries (Couldn't load OpenSsl libaries), this can easily be tested with the example media player, it won't play the example video as it is behind a https connection.

Stracing shows that the ffmpeg backend is looking for libssl.so.1.1 and libcrypto.so.1.1

Workarounds: install openssl 1.1 libraries (bad), use gstreamer backend (good)

Qt installed from online installer.