[flac-dev] New ID registration

Kurosawa, Taku taku.kurosawa at labelgate.com
Wed Dec 26 12:37:38 UTC 2018

Hi Martin,

Apologies my reply being late again.
There might have been some mis-explanation from my side, so let me explain the difference between Replaygain and our approach here.

- Replaygain
  The Gain calculation for the loudness normalization be done at content provide side.
  The result will be embedded within the content as metadata.
  The Normalization will be done at player side, according to the gain embedded within the content.

- Our approach
  Embed the binary data which reflect the character of the music within the content at content provider side.
  The gain calculation for the loudness normalization will be done at player side according to the binary data embedded within the content.
  The binary data could be used not only for the loudness normalization, but also for something else in the future.

Our approach uses float format binary data block, which could be encoded to text based metadata, but the process will be too complicated. It is not realistic from technical point of view.
Also, since the Key_Name of Vorbis Comment is not unique based operated, if other user uses same Key_Name as ours, that could result in in correct action and that could ultimately lead us to suffer multiple losses in the service.

Hope I am explaining correctly the necessity of new ID registration here.


> -----Original Message-----
> From: flac-dev [mailto:flac-dev-bounces at xiph.org] On Behalf Of Martin
> Leese
> Sent: Wednesday, December 12, 2018 4:20 AM
> To: flac-dev at xiph.org
> Subject: Re: [flac-dev] New ID registration
> On 12/11/18, Martin Leese <martin.leese at stanfordalumni.org> wrote:
> > A VorbisComment can store upto 2^64 bytes
> > (16 exabytes).  A FLAC metadata block is limited to 2^24 bytes (16
> > megabytes).
> > Therefore, a VorbisComment can be orders of magnitude bigger than a
> > FLAC metadata block.
> > Visit:
> >     https://wiki.xiph.org/Metadata
> Rereading my post, I implied that a
> VorbisComment inside a FLAC stream could be larger than a FLAC metadata
> block.  As the former must fit inside the latter (when inside a FLAC
> stream), the limit for both is the smaller of the two.
> > The advice to use a VorbisComment still looks good.
> This still looks good.
> Regards,
> Martin
> --
> Martin J Leese
> E-mail: martin.leese  stanfordalumni.org
> Web: http://members.tripod.com/martin_leese/
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