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                                                           Free Lossless Audio Codec (FLAC)

Created
        2024-03-01

Last Updated
        2026-10-09

Available Formats
        [IMG]
        XML [IMG]
        HTML [IMG]
        TXT

Registry Included Below

  • FLAC Application Metadata Block IDs

FLAC Application Metadata Block IDs

Registration Procedure(s)

 First Come First Served

Reference
        [RFC 9639]

Available Formats
        [IMG]
        CSV

Application ID ASCII Rendition (If                          Description                                   Reference              Change Controller
                   Available)
0x41544348     ATCH                FlacFile                                                      [FlacFile][RFC 9639]         IETF
0x42534F4C     BSOL                beSolo                                                        [RFC 9639]                   IETF
0x42554753     BUGS                Bugs Player                                                   [RFC 9639]                   IETF
0x43756573     Cues                GoldWave cue points                                           [RFC 9639]                   IETF
0x44495343     DISC                Red Book CD-DA LBA track layouts, TOC/CUE structures,         [Angel_Garcia_Rodriguez]     [Angel_Garcia_Rodriguez]
                                   verification logs, and additional data for audio preservation
0x46696361     Fica                CUE Splitter                                                  [RFC 9639]                   IETF
0x46746F6C     Ftol                flac-tools                                                    [RFC 9639]                   IETF
0x4D4F5442     MOTB                MOTB MetaCzar                                                 [RFC 9639]                   IETF
0x4D505345     MPSE                MP3 Stream Editor                                             [RFC 9639]                   IETF
0x4D754D4C     MuML                MusicML: Music Metadata Language                              [RFC 9639]                   IETF
0x52494646     RIFF                Sound Devices RIFF chunk storage                              [RFC 9639]                   IETF
0x5346464C     SFFL                Sound Font FLAC                                               [RFC 9639]                   IETF
0x534F4E59     SONY                Sony Creative Software                                        [RFC 9639]                   IETF
0x5351455A     SQEZ                flacsqueeze                                                   [RFC 9639]                   IETF
0x54745776     TtWv                TwistedWave                                                   [RFC 9639]                   IETF
0x55495453     UITS                UITS Embedding tools                                          [RFC 9639]                   IETF
0x61696666     aiff                FLAC AIFF chunk storage                                       [foreign-metadata][RFC 9639] IETF
0x696D6167     imag                flac-image                                                    [RFC 9639]                   IETF
0x7065656D     peem                Parseable Embedded Extensible Metadata                        [RFC 9639]                   IETF
0x71667374     qfst                QFLAC Studio                                                  [RFC 9639]                   IETF
0x72696666     riff                FLAC RIFF chunk storage                                       [foreign-metadata][RFC 9639] IETF
0x74756E65     tune                TagTuner                                                      [RFC 9639]                   IETF
0x77363420     w64 [1]             FLAC Wave64 chunk storage                                     [foreign-metadata][RFC 9639] IETF
0x78626174     xbat                XBAT                                                          [RFC 9639]                   IETF
0x786D6364     xmcd                xmcd                                                          [RFC 9639]                   IETF

                                                                 Contact Information

           ID                     Name                 Contact URI        Last Updated
[Angel_Garcia_Rodriguez] Angel Garcia Rodriguez mailto:angelgar&gmail.com 2026-10-09

                                                                       Footnote

[1] The value is "w64 " with a single space in order to be four bytes.


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