I usually tag Ogg Vorbis files with EasyTAG 2.1.7. 

Now, I want to produce Ogg Opus files, and I'm not able to write tags into the file. EasyTAG bears about Ogg file not having a Vorbis or a Speex stream.

Another tools, such as lltag, spits messages like "Skipping this file with unknown type."

Some advice? Thanks.