Works very well for mp3, does not work for wav and ogg, only works halfway for flac. (a pull request is underway to fix the bug) in the meantime you can replace the files "/usr/share/nemo-audio-tab/nemo-audio-tab.glade" and "/usr/share/nemo-python/extensions/nemo-audio-tab.py" by those of this repository : https://github.com/robinechuca/nemo-extensions/tree/master/nemo-audio-tab/nemo-extension . (the new dependencies are apt install ffmpeg && pip install ffmpeg-python)

Dosn't work with flacs. At least on Mint 20.1...

:D Simple Preview http://i.imgur.com/naTKxEd.png