The formal README is written in Japanese.

opuscomment is a utility for editing output gain and tags of Ogg Opus. The behavior of this utility is similar to vorbiscomment.

• C99 or later
• POSIX.1-2008 or POSIX.1-2001 XSI extension (SUSv3)
• libogg

$ ./build.sh release

Then you will get the binary opuscomment at src/. You can put the binary any place.

# list tags
opuscomment foo.opus

# write tags
opuscomment -w foo.opus <<EOL
TITLE=The Song
ARTIST=John Doe
EOL

# import tags from Vorbis
vorbiscomment -Re foo.ogg |opuscomment -wRe foo.opus

• Ogg family: Opus, Vorbis, Speex, VP8, Theora, Daala, PCM, UVS.
• FLAC

MIT license