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https://opus-codec.org/docs/opusfile_api-0.12/group__header__info.html |
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Apparently opus uses EBU R 128, and not ReplayGain, tags for loudness equalization. They're stored in Q7.8 numbers and R128 is set 5 dB lower than ReplayGain 2.0. The attached patch reads the supported tags (RFC7845) and makes loudgained opus content play at the corrected levels while using Audacious' gain adjustment implementation.
opus loudness patch.txt
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