Hi, tried with Opera 73.0.3856.344 and win 10 64. Works.
Thanks for the test, In fact I see that it is a known Bug in the version for linux.
You need to download the latest version of libffmpeg.so and copy it to /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so
Thanks for testing it allowed me to find the problem. It works that way.
Not logged in users can't 'Comments Post'.