Tested with the latest v2.87c, if a file was encoded in opus and renamed file extension to
.ogg, then mp3tag will not be able to read tags.
as shown above, foobar2000 v1.4 beta 11 is able to handle tags correctly regardless the extension name, but mp3tag can only read/write tags for opus files that end with
The recommended filename extension for Ogg Opus files is .opus. according to https://wiki.xiph.org/OggOpus, changing file extension name to
.ogg is the only way to make Android mediaserver pick up these files. In addition, Android is able to play
opus files with
.ogg extension and read their tags w/o any problem since Marshmallow, according to https://android.stackexchange.com/questions/37970/what-can-play-ogg-opus-on-android. I'm also able to comfirm this on my Nexus 6P running Android 8.1.