[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 #14 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
Played without rgvolume, those sound about the same I think. The Vorbis one has
a track gain of -8.79, the Opus one of 0. If I change the code to offset by -5
(the R128 difference from current replay gain) minus 3.79, I get something that
sounds about hte same volume. Is the R128_TRACK_GAIN in the Opus file really
supposed to be 0 ?

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