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>The use of R128 also raises the question about "REPLAYGAIN_REFERENCE_LOUDNESS" >tag. Currently flac/metaflac writes "REPLAYGAIN_REFERENCE_LOUDNESS=89.0 dB" >but doesn't use it when decoding (it seems that nothing uses this tag). >R128 defines reference level differently, so this tag makes little sense for >it. IMHO it's better not to write this tag when

...dB reference loudness tags. a) According to David Robinson, "ReplayGain tags should always be quoted relative to 89dB". So all files that were scanned 10 years ago with a reference level == 83dB should be fixed. And IMHO it's a good idea. b) According to http://wiki.xiph.org/OggOpus#Comment_Header there should be no REPLAYGAIN_*** tags in Opus files; Opus uses R128_TRACK_GAIN tag. If some audio player reads Opus tags then it should be aware of the difference between ReplayGain and R128. But this doesn't require REPLAYGAIN_REFERENCE_LOUDNESS tag. > While adding the option for R128 g...

>b) According to http://wiki.xiph.org/OggOpus#Comment_Header >there should be no REPLAYGAIN_*** tags in Opus files; Opus uses >R128_TRACK_GAIN tag. If some audio player reads Opus tags then it should >be aware of the difference between ReplayGain and R128. But this doesn't >require REPLAYGAIN_REFERENCE_LOUDNESS tag. > > The Opus replayg...