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replaygain reference level tag?
jcoalson
post Jul 6 2006, 16:28
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is there a standard or at least a consensus on what the name of the tag for storing the replaygain reference level should be? I was planning to add that to flac/metaflac.
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Cartman_Sr
post Jul 6 2006, 17:09
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That would be a useful thing to have. How about REPLAYGAIN_REFERENCE? I don't know.

Can I make another request for metaflac? Multi-line tags support for metaflac. I know tag.exe works well for this purpose, but it would be good to have multi-line tags sort of "officially sanctioned" in flac.
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kjoonlee
post Jul 6 2006, 17:17
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When vorbisgain was being developped, I think there was some discussion about the tag names.

At first vorbisgain used RG_TPEAK (I think it was), RG_APEAK, and RG_TGAIN, but the names were later switched to REPLAYGAIN_TRACK_PEAK etc. in favour of clarity and Googlability.

Vorbis comments are meant to be human-readable and short. REPLAYGAIN_TRACK_PEAK is human readable, and the tag contents are easily machine parsable.

IMHO, REPLAYGAIN_TARGET_LOUDNESS or REPLAYGAIN_REFERENCE_LOUDNESS or something similar would be best.

---

But would it necessary? 89 dB is almost always used.

edit: Correction. Track gain used to be called radio and album gain used to be called audiophile, so it couldn't have been RG_TPEAK.

This post has been edited by kjoonlee: Jul 6 2006, 18:19


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Alex B
post Jul 6 2006, 18:04
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QUOTE (kjoonlee @ Jul 6 2006, 19:17) *
But would it necessary? 89 dB is almost always used.


At least J. River uses 83 dB by default in Media Jukebox and Media Center as originally proposed. They implimented it already in late 2001/early 2002 during the Media Jukebox v. 8 development. Though they also use proprietary tags for storing the info (at that time there was no standard yet). However, it would be good to develop a standard for storing the used reference. For example, if someone would like to make a converter that converts between different Replay Gain tag implimentations it would be necessary to know the used reference.


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kjoonlee
post Jul 6 2006, 18:17
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LAME used to use 83 dB but they switched to 89. Maybe they should switch too?


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Patsoe
post Jul 6 2006, 20:40
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I always wondered why the protocol doesn't just store the calculated level. So if your track has an average level of 90dB, just store it as "90dB". Then the player always gets the relative gains right, regardless the reference level it uses internally.

How about introducing "REPLAYGAIN_ABS_LEVEL"?

This post has been edited by Patsoe: Jul 6 2006, 20:42
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David Nordin
post Jul 6 2006, 21:21
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relative to 0dBFS smile.gif


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jcoalson
post Jul 6 2006, 22:50
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well, I could have sworn that this tag was already being done somewhere. ok, I will just blaze a trail with REPLAYGAIN_REFERENCE_LEVEL=89dB (SPL being implied).

Josh
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kjoonlee
post Jul 7 2006, 03:19
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QUOTE (jcoalson @ Jul 7 2006, 06:50) *
well, I could have sworn that this tag was already being done somewhere. ok, I will just blaze a trail with REPLAYGAIN_REFERENCE_LEVEL=89dB (SPL being implied).

Josh

Don't forget to include a space between 89 and dB for consistency. ("REPLAYGAIN_TRACK_GAIN=+0.41 dB")


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jcoalson
post Sep 14 2006, 01:40
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I've added the new tag to all the code in CVS, this will be in the next release. the tag currently looks like:

CODE
REPLAYGAIN_REFERENCE_LOUDNESS=89.0 dB


is that OK with everybody?

Josh
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Patsoe
post Sep 15 2006, 08:00
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Looks fine to me smile.gif
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