[Bug 753275] Opus: playback gain always relative to EBU R128 level (-23db LUFS), must be played 5db louder to match ReplayGain level (-18db LUFS) when using ReplayGain

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753275

--- Comment #21 from Nikolaus Waxweiler <madigens at gmail.com> ---
They're different algorithms and can come to different conclusions, the 5 dB
are just the difference between the reference levels. There are problem samples
that show differences of 10 dB (search Hydrogenaudio). However: Foobar2000
seems to use the EBU R128 algorithm in newer versions and still writes the
results to ReplayGain tags. So you never know what algorithm was actually used
by looking at whatever tags. And the difference for the majority of audio out
there is probably small. You could lower ReplayGain things by 5 dB, too, it
would just go against what users might be accustomed to ;)

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