Tags

This is an attempt to document which tags (in terms of low-level technical specification) faircamp supports/uses for its own fields, which ones it writes, etc. Note that this documentation might not always be 100% complete or accurate, as tags and their standardisation tend to be messy.

AAC

Embedded cover images: Not supported

AIFF

Embedded cover images: Not supported

Same tags as MP3 and WAV - see ID3.

ALAC

Tag decoding for ALAC uses the mp4parse crate.

Embedded cover images: Not supported License: cprt (tbd) Release title: ©alb Release artist: aART Track artist/s: ©art, ©ART Track number: trkn Track title: ©nam

Flac

Tag decoding for Flac uses the metaflac crate.

Embedded cover images: Supported

Same tags as Ogg Vorbis and Opus - see Ogg Vorbis.

ID3

Tag decoding for ID3 uses the id3 crate.

License: TCR [2.2] / TCOP [2.3, 2.4] (Copyright) (tbd) Release title: TALB (Album) Release artist: TPE2 (Album artist) Track artist/s: TPE1 (Artist/s) Track number: TRCK (Track) Track title: TIT2 (Title)

MP3

Embedded cover images: Supported

When transcoding to MP3, faircamp writes tags as ID3v2.3 rather than the latest ID3v2.4. This is done to achieve greater compatibility with players and operating systems (e.g. Windows and its media player have a long history of not supporting ID3v2.4 tags).

Same tags as AIFF and WAV - see ID3.

Ogg Vorbis

Tag decoding for Ogg Vorbis uses the lewton crate.

Embedded cover images: Not supported License: "copyright" (tbd) Release title: "album" Release artist: "albumartist", "album artist" Track artist/s: "artist" Track number: "track_number" Track title: "title"

Opus

Tag decoding for Opus uses the opus_headers crate.

Embedded cover images: Not supported

Same tags as Flac and Ogg Vorbis - see Ogg Vorbis.

WAV

Embedded cover images: Not supported

Known limitiations:

• Album artist tags can not be written to WAV files (at least not by FFmpeg, which is used by faircamp to encode audio files), therefore this tag will not appear in any WAV files generated by faircamp.
• Tags will only be copied to WAV output files with the tags: copy release option. (FFmpeg does not support explicitly defining the tags to be written to a WAV file, it only allows a full copy to be performed, or at least attempted)
• ID3 in WAV is generally pretty non-standard, so anything relating to tags in WAV can be considered unstable and might lead to glitches down to the player level.

Same tags as AIFF and MP3 - see ID3.