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Normalize loudness
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Should LinguaLibre normalize the loudness of recordings to EBU R 128, so that pronunciations are perceived equally loud irrespective of user microphones?

ffmpeg can do this, either if you call it directly (rather painful), or via the ffmpeg-normalize wrapper script. It’s also possible to embed metadata with loudness parameters, which some (but not all) players recognize. But in the context of LinguaLibre, which does not use a lossy audio compression, it might be best to normalize loudness on the server at preprocessing time.

See discussion in the Lingua Libre chatroom for the thoughts of others.

Event Timeline

Sascha created this task.Jan 11 2019, 11:16 AM
KaMan added a subscriber: KaMan.Jan 11 2019, 8:37 PM
Pamputt moved this task from Backlog to RecordWizard on the Lingua Libre board.May 5 2020, 10:19 AM