# AVMetadataIdentifier A structure that defines identifiers for metadata formats. ``` struct AVMetadataIdentifier ``` ## Topics ### Common metadata identifiers [`AVMetadataCommonIdentifierAccessibilityDescription`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierAccessibilityDescription) An identifier that represents the accessibility description for the media. [`AVMetadataCommonIdentifierAlbumName`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierAlbumName) An identifier that represents the name of the album. [`AVMetadataCommonIdentifierArtist`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierArtist) An identifier that represents the name of the artist. [`AVMetadataCommonIdentifierArtwork`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierArtwork) An identifier that represents an image relating to the album. [`AVMetadataCommonIdentifierAssetIdentifier`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierAssetIdentifier) An identifier that represents the asset ID for the media. [`AVMetadataCommonIdentifierAuthor`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierAuthor) An identifier that represents the name of the author. [`AVMetadataCommonIdentifierContributor`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierContributor) An identifier that represents the name of the contributor. [`AVMetadataCommonIdentifierCopyrights`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierCopyrights) An identifier that represents the copyright statement. [`AVMetadataCommonIdentifierCreationDate`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierCreationDate) An identifier that represents the date of the original recording. [`AVMetadataCommonIdentifierCreator`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierCreator) An identifier that represents the name of the creator. [`AVMetadataCommonIdentifierDescription`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierDescription) An identifier that represents the description of the media. [`AVMetadataCommonIdentifierFormat`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierFormat) An identifier that represents the file format of the media content. [`AVMetadataCommonIdentifierLanguage`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierLanguage) An identifier that represents the language of the text or lyrics spoken or sung in the audio. [`AVMetadataCommonIdentifierLastModifiedDate`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierLastModifiedDate) An identifier that represents the last modification date of the media. [`AVMetadataCommonIdentifierLocation`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierLocation) An identifier that represents the location information for the media. [`AVMetadataCommonIdentifierMake`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierMake) An identifier that represents the name of the camera maker. [`AVMetadataCommonIdentifierModel`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierModel) An identifier that represents the name of the camera model. [`AVMetadataCommonIdentifierPublisher`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierPublisher) An identifier that represents the name of the publisher. [`AVMetadataCommonIdentifierRelation`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierRelation) An identifier that represents the relation information for the media. [`AVMetadataCommonIdentifierSoftware`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierSoftware) An identifier that represents the name of the software used to create the media. [`AVMetadataCommonIdentifierSource`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierSource) An identifier that represents the source information for the media. [`AVMetadataCommonIdentifierSubject`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierSubject) An identifier that represents the subject information for the media. [`AVMetadataCommonIdentifierTitle`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierTitle) An identifier that represents the title of the media. [`AVMetadataCommonIdentifierType`](/documentation/AVFoundation/AVMetadataIdentifier/commonIdentifierType) An identifier that represents the media type. ### iTunes metadata identifiers [`AVMetadataIdentifieriTunesMetadataAccountKind`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataAccountKind) An identifier that represents the kind of iTunes account. [`AVMetadataIdentifieriTunesMetadataAcknowledgement`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataAcknowledgement) An identifier that represents the acknowledgement information in iTunes. [`AVMetadataIdentifieriTunesMetadataAlbum`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataAlbum) An identifier that represents the name of the album in iTunes. [`AVMetadataIdentifieriTunesMetadataAlbumArtist`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataAlbumArtist) An identifier that represents the artist for the album. [`AVMetadataIdentifieriTunesMetadataAppleID`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataAppleID) An identifier that represents an Apple ID. [`AVMetadataIdentifieriTunesMetadataArranger`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataArranger) An identifier that represents the name of the arranger. [`AVMetadataIdentifieriTunesMetadataArtDirector`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataArtDirector) An identifier that represents the name of the art director. [`AVMetadataIdentifieriTunesMetadataArtist`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataArtist) An identifier that represents the name of the artist. [`AVMetadataIdentifieriTunesMetadataArtistID`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataArtistID) An identifier that represents the ID for an artist. [`AVMetadataIdentifieriTunesMetadataAuthor`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataAuthor) An identifier that represents the name of the author. [`AVMetadataIdentifieriTunesMetadataBeatsPerMin`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataBeatsPerMin) An identifier that represents the beats per minute of a track in iTunes. [`AVMetadataIdentifieriTunesMetadataComposer`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataComposer) An identifier that represents the name of the composer. [`AVMetadataIdentifieriTunesMetadataConductor`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataConductor) An identifier that represents the name of the conductor. [`AVMetadataIdentifieriTunesMetadataContentRating`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataContentRating) An identifier that represents the content rating in iTunes. [`AVMetadataIdentifieriTunesMetadataCopyright`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataCopyright) An identifier that represents the copyright statement in iTunes. [`AVMetadataIdentifieriTunesMetadataCoverArt`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataCoverArt) An identifier that represents an album cover image. [`AVMetadataIdentifieriTunesMetadataCredits`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataCredits) An identifier that represents the credits for the source content. [`AVMetadataIdentifieriTunesMetadataDescription`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataDescription) An identifier that represents the description information in iTunes. [`AVMetadataIdentifieriTunesMetadataDirector`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataDirector) An identifier that represents the name of the director. [`AVMetadataIdentifieriTunesMetadataDiscCompilation`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataDiscCompilation) An identifier that represents whether an album is a compilation of tracks in iTunes. [`AVMetadataIdentifieriTunesMetadataDiscNumber`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataDiscNumber) An identifier that represents the disc number of a multi-CD album in iTunes. [`AVMetadataIdentifieriTunesMetadataEncodedBy`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataEncodedBy) An identifier that represents the person or organization responsible for encoding the media. [`AVMetadataIdentifieriTunesMetadataEncodingTool`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataEncodingTool) An identifier that represents the software or hardware and settings used for encoding. [`AVMetadataIdentifieriTunesMetadataEQ`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataEQ) An identifier that represents the equalizer preset option in iTunes. [`AVMetadataIdentifieriTunesMetadataExecProducer`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataExecProducer) An identifier that represents the name of the executive producer. [`AVMetadataIdentifieriTunesMetadataGenreID`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataGenreID) An identifier that represents the genre ID. [`AVMetadataIdentifieriTunesMetadataGrouping`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataGrouping) An identifier that represents additional grouping information for an album. [`AVMetadataIdentifieriTunesMetadataLinerNotes`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataLinerNotes) An identifier that represents the digital booklet for an album. [`AVMetadataIdentifieriTunesMetadataLyrics`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataLyrics) An identifier that represents the lyrics in the recording. [`AVMetadataIdentifieriTunesMetadataOnlineExtras`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataOnlineExtras) An identifier that represents the extra materials for an album. [`AVMetadataIdentifieriTunesMetadataOriginalArtist`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataOriginalArtist) An identifier that represents the name of the original artist. [`AVMetadataIdentifieriTunesMetadataPerformer`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataPerformer) An identifier that represents the name of the performer. [`AVMetadataIdentifieriTunesMetadataPhonogramRights`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataPhonogramRights) An identifier that represents the phonogram rights statement. [`AVMetadataIdentifieriTunesMetadataPlaylistID`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataPlaylistID) An identifier that represents the playlist ID. [`AVMetadataIdentifieriTunesMetadataPredefinedGenre`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataPredefinedGenre) An identifier that represents the predefined genre. [`AVMetadataIdentifieriTunesMetadataProducer`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataProducer) An identifier that represents the name of the producer. [`AVMetadataIdentifieriTunesMetadataPublisher`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataPublisher) An identifier that represents the name of the publisher. [`AVMetadataIdentifieriTunesMetadataRecordCompany`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataRecordCompany) An identifier that represents the name of the record company. [`AVMetadataIdentifieriTunesMetadataReleaseDate`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataReleaseDate) An identifier that represents the release date for the original recording. [`AVMetadataIdentifieriTunesMetadataSoloist`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataSoloist) An identifier that represents the name of the soloist. [`AVMetadataIdentifieriTunesMetadataSongID`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataSongID) An identifier that represents the song ID. [`AVMetadataIdentifieriTunesMetadataSongName`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataSongName) An identifier that represents the name of the song in iTunes. [`AVMetadataIdentifieriTunesMetadataSoundEngineer`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataSoundEngineer) An identifier that represents the name of the sound engineer. [`AVMetadataIdentifieriTunesMetadataThanks`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataThanks) An identifier that represents the thanks statement in iTunes. [`AVMetadataIdentifieriTunesMetadataTrackNumber`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataTrackNumber) An identifier that represents the order number in iTunes. [`AVMetadataIdentifieriTunesMetadataTrackSubTitle`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataTrackSubTitle) An identifier that represents the information relating to the contents title. [`AVMetadataIdentifieriTunesMetadataUserComment`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataUserComment) An identifier that represents a user comment regarding the content. [`AVMetadataIdentifieriTunesMetadataUserGenre`](/documentation/AVFoundation/AVMetadataIdentifier/iTunesMetadataUserGenre) An identifier that represents the genre set by a user in iTunes. ### QuickTime metadata identifiers [`AVMetadataIdentifierQuickTimeMetadataAIMEData`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataAIMEData) A value of type kCMMetadataBaseDataType_RawData [`AVMetadataIdentifierQuickTimeMetadataAccessibilityDescription`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataAccessibilityDescription) An identifier that represents the accessibility description for the movie file content. [`AVMetadataIdentifierQuickTimeMetadataAlbum`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataAlbum) An identifier that represents the name of the album or collection in QuickTime. [`AVMetadataIdentifierQuickTimeMetadataArranger`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataArranger) An identifier that represents the name of the arranger of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataArtist`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataArtist) An identifier that represents the name of the artist of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataArtwork`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataArtwork) An identifier that represents an image relating to the movie file content. [`AVMetadataIdentifierQuickTimeMetadataAuthor`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataAuthor) An identifier that represents the name of the author of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataAutoLivePhoto`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataAutoLivePhoto) An identifier that represents whether the live photo movie used auto mode. [`AVMetadataIdentifierQuickTimeMetadataCameraFocalLength35mmEquivalent`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraFocalLength35mmEquivalent) A value of type kCMMetadataBaseDataType_UTF8 indicating focal length normalized to the 35mm film equivalent value (e.g. “50.00mm”). [`AVMetadataIdentifierQuickTimeMetadataCameraFrameReadoutTime`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraFrameReadoutTime) An identifier that represents the camera frame readout time in QuickTime. [`AVMetadataIdentifierQuickTimeMetadataCameraISOSensitivity`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraISOSensitivity) A value of type kCMMetadataBaseDataType_UTF8 indicating the sensitivity of the camera to light in terms of ISO exposure index (e.g. “800”). See SMPTE RDD 18. [`AVMetadataIdentifierQuickTimeMetadataCameraIdentifier`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraIdentifier) An identifier that represents the camera identifier in QuickTime. [`AVMetadataIdentifierQuickTimeMetadataCameraLensIrisFNumber`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraLensIrisFNumber) A value of type kCMMetadataBaseDataType_UTF8 indicating measure of the amount of light transmitted through the lens. It is the focal length divided by the effective lens aperture diameter (e.g. “F2.8” or “2.8”). [`AVMetadataIdentifierQuickTimeMetadataCameraLensModel`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraLensModel) A value of type kCMMetadataBaseDataType_UTF8 indicating the lens model (e.g. “iPhone 16 Pro back camera 6.765mm f/1.78”). [`AVMetadataIdentifierQuickTimeMetadataCameraShutterSpeedAngle`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraShutterSpeedAngle) A value of type kCMMetadataBaseDataType_UTF8 indicating the exposure period expressed as an angle in minutes (1/60 degree) (e.g. “21600” or “360.00deg””). [`AVMetadataIdentifierQuickTimeMetadataCameraShutterSpeedTime`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraShutterSpeedTime) A value of type kCMMetadataBaseDataType_UTF8 indicating the exposure period expressed as a time per one frame/field period in seconds. [`AVMetadataIdentifierQuickTimeMetadataCameraWhiteBalance`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCameraWhiteBalance) A value of type kCMMetadataBaseDataType_UTF8 indicating the white balance value defined by the temperature in Kelvin units (e.g. “5500K” or “5500”). See SMPTE RDD 18. [`AVMetadataIdentifierQuickTimeMetadataCinematicVideoIntent`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCinematicVideoIntent) A value of type `kCMMetadataBaseDataType_UInt8` indicating whether this movie is intended as a Cinematic Video (1) or not (0). [`AVMetadataIdentifierQuickTimeMetadataCollectionUser`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCollectionUser) An identifier that represents a name that indicates a user-defined collection. [`AVMetadataIdentifierQuickTimeMetadataComment`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataComment) An identifier that represents a comment regarding the movie file content. [`AVMetadataIdentifierQuickTimeMetadataComposer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataComposer) An identifier that represents the name of the composer of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataContentIdentifier`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataContentIdentifier) An identifier that represents the content identifier in QuickTime. [`AVMetadataIdentifierQuickTimeMetadataCopyright`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCopyright) An identifier that represents the copyright statement for the movie file content. [`AVMetadataIdentifierQuickTimeMetadataCreationDate`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCreationDate) An identifier that represents the creation date of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataCredits`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataCredits) An identifier that represents the credits of the movie source content. [`AVMetadataIdentifierQuickTimeMetadataDescription`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDescription) An identifier that represents the description of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDetectedCatBody`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDetectedCatBody) An identifier that represents a detected cat body in the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDetectedDogBody`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDetectedDogBody) An identifier that represents a detected dog body in the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDetectedFace`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDetectedFace) An identifier that represents a detected face in the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDetectedHumanBody`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDetectedHumanBody) An identifier that represents a detected human body in the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDetectedSalientObject`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDetectedSalientObject) An identifier that represents a detected salient object in the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDirectionFacing`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDirectionFacing) An identifier that represents the direction the camera is facing during the shot. [`AVMetadataIdentifierQuickTimeMetadataDirectionMotion`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDirectionMotion) An identifier that represents the direction the camera is moving during the shot. [`AVMetadataIdentifierQuickTimeMetadataDirector`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDirector) An identifier that represents the name of the director of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataDisplayName`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataDisplayName) An identifier that represents the display name of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataEncodedBy`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataEncodedBy) An identifier that represents the name of the person or organization responsible for encoding the movie file content. [`AVMetadataIdentifierQuickTimeMetadataFullFrameRatePlaybackIntent`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataFullFrameRatePlaybackIntent) An identifier that represents whether this movie should play at full frame rate. [`AVMetadataIdentifierQuickTimeMetadataGenre`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataGenre) An identifier that represents the genre or genres to which the movie content conforms. [`AVMetadataIdentifierQuickTimeMetadataInformation`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataInformation) An identifier that represents general information about the movie file content. [`AVMetadataIdentifierQuickTimeMetadataIsMontage`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataIsMontage) An identifier that represents that a movie is a montage of other media. [`AVMetadataIdentifierQuickTimeMetadataKeywords`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataKeywords) An identifier that represents the keywords for the movie file content. [`AVMetadataIdentifierQuickTimeMetadataLivePhotoVitalityScore`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLivePhotoVitalityScore) An identifier that represents the vitality score of the Live Photo movie. [`AVMetadataIdentifierQuickTimeMetadataLivePhotoVitalityScoringVersion`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLivePhotoVitalityScoringVersion) An identifier that represents the version of the algorithm responsible for scoring the Live Photo movie for vitality. [`AVMetadataIdentifierQuickTimeMetadataLocationBody`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationBody) An identifier that represents the astronomical body for compatibility with the 3GPP format. [`AVMetadataIdentifierQuickTimeMetadataLocationDate`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationDate) An identifier that represents a date and time using the extended format defined in ISO 8601:2004. [`AVMetadataIdentifierQuickTimeMetadataLocationHorizontalAccuracyInMeters`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationHorizontalAccuracyInMeters) An identifier that represents the horizontal accuracy of the location data. [`AVMetadataIdentifierQuickTimeMetadataLocationISO6709`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationISO6709) An identifier that represents the geographic point location by coordinates as defined in ISO 6709:2008. [`AVMetadataIdentifierQuickTimeMetadataLocationName`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationName) An identifier that represents the name of the location. [`AVMetadataIdentifierQuickTimeMetadataLocationNote`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationNote) An identifier that represents a descriptive comment about the location. [`AVMetadataIdentifierQuickTimeMetadataLocationRole`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataLocationRole) An identifier that represents the single byte describing the movie location. [`AVMetadataIdentifierQuickTimeMetadataMake`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataMake) An identifier that represents the name of the camera maker. [`AVMetadataIdentifierQuickTimeMetadataModel`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataModel) An identifier that represents the name of the camera model. [`AVMetadataIdentifierQuickTimeMetadataOriginalArtist`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataOriginalArtist) An identifier that represents the name of the original artist of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataPerformer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataPerformer) An identifier that represents the name of the performer in the movie file content. [`AVMetadataIdentifierQuickTimeMetadataPhonogramRights`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataPhonogramRights) An identifier that represents the phonogram rights statement. [`AVMetadataIdentifierQuickTimeMetadataPreferredAffineTransform`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataPreferredAffineTransform) An identifier that represents the affine transform preference for the movie file content. [`AVMetadataIdentifierQuickTimeMetadataPresentationImmersiveMedia`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataPresentationImmersiveMedia) A value of type kCMMetadataBaseDataType_RawData [`AVMetadataIdentifierQuickTimeMetadataProducer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataProducer) An identifier that represents the name of the producer of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataPublisher`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataPublisher) An identifier that represents the name of the publisher of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataRatingUser`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataRatingUser) An identifier that represents the rating or relative value of the movie. [`AVMetadataIdentifierQuickTimeMetadataSoftware`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataSoftware) An identifier that represents the name of software used to create the movie file content. [`AVMetadataIdentifierQuickTimeMetadataSpatialOverCaptureQualityScore`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataSpatialOverCaptureQualityScore) An identifier that represents a score that indicates the quality of an asset. [`AVMetadataIdentifierQuickTimeMetadataSpatialOverCaptureQualityScoringVersion`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataSpatialOverCaptureQualityScoringVersion) An identifier that represents the version of the algorithm responsible for generating a score. [`AVMetadataIdentifierQuickTimeMetadataTitle`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataTitle) An identifier that represents the title of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataVideoOrientation`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataVideoOrientation) An identifier that represents the orientation of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataWhiteBalanceByCCTColorMatrices`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataWhiteBalanceByCCTColorMatrices) A value of type kCMMetadataBaseDataType_RawData indicating the reference color translation matrix data for ProRes RAW. [`AVMetadataIdentifierQuickTimeMetadataWhiteBalanceByCCTWhiteBalanceFactors`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataWhiteBalanceByCCTWhiteBalanceFactors) A value of type kCMMetadataBaseDataType_RawData indicating the reference white balance multiplication factor data for ProRes RAW. [`AVMetadataIdentifierQuickTimeMetadataYear`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataYear) An identifier that represents the recording year of the movie file content. [`AVMetadataIdentifierQuickTimeMetadataiXML`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeMetadataiXML) An identifier that represents iXML information for the movie file content. ### QuickTime user metadata identifiers [`AVMetadataIdentifierQuickTimeUserDataAccessibilityDescription`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataAccessibilityDescription) An identifier that represents the accessibility description for the movie file content. [`AVMetadataIdentifierQuickTimeUserDataAlbum`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataAlbum) An identifier that represents the name of the album or collection in QuickTime. [`AVMetadataIdentifierQuickTimeUserDataArranger`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataArranger) An identifier that represents the name of the arranger of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataArtist`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataArtist) An identifier that represents the name of the artist of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataAuthor`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataAuthor) An identifier that represents the name of the author of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataChapter`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataChapter) An identifier that represents the name of the chapter. [`AVMetadataIdentifierQuickTimeUserDataComment`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataComment) An identifier that represents a comment regarding the movie file content. [`AVMetadataIdentifierQuickTimeUserDataComposer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataComposer) An identifier that represents the name of the composer of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataCopyright`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataCopyright) An identifier that represents the copyright statement in QuickTime. [`AVMetadataIdentifierQuickTimeUserDataCreationDate`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataCreationDate) An identifier that represents the creation date of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataCredits`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataCredits) An identifier that represents the credits of movie source content. [`AVMetadataIdentifierQuickTimeUserDataDescription`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataDescription) An identifier that represents the description of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataDirector`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataDirector) An identifier that represents the name of the director of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataDisclaimer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataDisclaimer) An identifier that represents the disclaimer regarding the movie file content. [`AVMetadataIdentifierQuickTimeUserDataEncodedBy`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataEncodedBy) An identifier that represents the name of the person or organization responsible for encoding the movie file content. [`AVMetadataIdentifierQuickTimeUserDataFullName`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataFullName) An identifier that represents the full name of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataGenre`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataGenre) An identifier that represents the genre or genres to which the movie content conforms. [`AVMetadataIdentifierQuickTimeUserDataHostComputer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataHostComputer) An identifier that represents the name of the host computer. [`AVMetadataIdentifierQuickTimeUserDataInformation`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataInformation) An identifier that represents general information about the movie file content. [`AVMetadataIdentifierQuickTimeUserDataKeywords`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataKeywords) An identifier that represents the keywords for the movie file content. [`AVMetadataIdentifierQuickTimeUserDataLocationISO6709`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataLocationISO6709) An identifier that represents the geographic point location by coordinates as defined in ISO 6709:2008. [`AVMetadataIdentifierQuickTimeUserDataMake`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataMake) An identifier that represents the name of the camera maker. [`AVMetadataIdentifierQuickTimeUserDataModel`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataModel) An identifier that represents the name of the camera model. [`AVMetadataIdentifierQuickTimeUserDataOriginalArtist`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataOriginalArtist) An identifier that represents the name of the original artist of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataOriginalFormat`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataOriginalFormat) An identifier that represents the original format of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataOriginalSource`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataOriginalSource) An identifier that represents the original source of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataPerformers`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataPerformers) An identifier that represents the name of the performers in the movie file content. [`AVMetadataIdentifierQuickTimeUserDataPhonogramRights`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataPhonogramRights) An identifier that represents the phonogram rights statement. [`AVMetadataIdentifierQuickTimeUserDataProducer`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataProducer) An identifier that represents the name of the producer of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataProduct`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataProduct) An identifier that represents the name of the product. [`AVMetadataIdentifierQuickTimeUserDataPublisher`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataPublisher) An identifier that represents the name of the publisher of the movie file content. [`AVMetadataIdentifierQuickTimeUserDataSoftware`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataSoftware) An identifier that represents the name of software used to create the movie file content. [`AVMetadataIdentifierQuickTimeUserDataSpecialPlaybackRequirements`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataSpecialPlaybackRequirements) An identifier that represents the special hardware and software requirements for playback. [`AVMetadataIdentifierQuickTimeUserDataTaggedCharacteristic`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataTaggedCharacteristic) An identifier that represents the tagged characteristic. [`AVMetadataIdentifierQuickTimeUserDataTrackName`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataTrackName) An identifier that represents the name of a track in the movie file content. [`AVMetadataIdentifierQuickTimeUserDataTrack`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataTrack) An identifier that represents a track in the movie file content. [`AVMetadataIdentifierQuickTimeUserDataURLLink`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataURLLink) An identifier that represents the webpage for the movie file content. [`AVMetadataIdentifierQuickTimeUserDataWarning`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataWarning) An identifier that represents the warning text for the movie file content. [`AVMetadataIdentifierQuickTimeUserDataWriter`](/documentation/AVFoundation/AVMetadataIdentifier/quickTimeUserDataWriter) An identifier that represents the name of the writer of the movie file content. ### ID3 metadata identifiers [`AVMetadataIdentifierID3MetadataAlbumSortOrder`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataAlbumSortOrder) An identifier that represents how to sort the album. [`AVMetadataIdentifierID3MetadataAlbumTitle`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataAlbumTitle) An identifier that represents the title of the recording. [`AVMetadataIdentifierID3MetadataAttachedPicture`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataAttachedPicture) An identifier that represents an image relating to the audio file. [`AVMetadataIdentifierID3MetadataAudioEncryption`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataAudioEncryption) An identifier that represents the encryption details of the audio stream. [`AVMetadataIdentifierID3MetadataAudioSeekPointIndex`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataAudioSeekPointIndex) An identifier that represents the list of seek points within the audio file. [`AVMetadataIdentifierID3MetadataBand`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataBand) An identifier that represents additional information about the performers in the recording. [`AVMetadataIdentifierID3MetadataBeatsPerMinute`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataBeatsPerMinute) An identifier that represents the beats per minute of the audio. [`AVMetadataIdentifierID3MetadataComments`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataComments) An identifier that represents additional text information for the media. [`AVMetadataIdentifierID3MetadataCommercial`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataCommercial) An identifier that represents the commercial details for the media. [`AVMetadataIdentifierID3MetadataCommercialInformation`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataCommercialInformation) An identifier that represents the webpage containing purchasing information. [`AVMetadataIdentifierID3MetadataComposer`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataComposer) An identifier that represents the name of the composer. [`AVMetadataIdentifierID3MetadataConductor`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataConductor) An identifier that represents the name of the conductor. [`AVMetadataIdentifierID3MetadataContentGroupDescription`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataContentGroupDescription) An identifier that indicates the sound belongs to a larger category of sounds or music. [`AVMetadataIdentifierID3MetadataContentType`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataContentType) An identifier that represents the media content type. [`AVMetadataIdentifierID3MetadataCopyright`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataCopyright) An identifier that represents the copyright statement. [`AVMetadataIdentifierID3MetadataCopyrightInformation`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataCopyrightInformation) An identifier that represents the webpage describing the terms of use and ownership. [`AVMetadataIdentifierID3MetadataDate`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataDate) An identifier that represents the date for the recording. [`AVMetadataIdentifierID3MetadataEncodedBy`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEncodedBy) An identifier that represents the person or organization responsible for encoding the media. [`AVMetadataIdentifierID3MetadataEncodedWith`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEncodedWith) An identifier that represents the software or hardware and settings used for encoding. [`AVMetadataIdentifierID3MetadataEncodingTime`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEncodingTime) An identifier that represents the encoding time of the audio. [`AVMetadataIdentifierID3MetadataEncryption`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEncryption) An identifier that represents the encryption method used. [`AVMetadataIdentifierID3MetadataEqualization`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEqualization) An identifier that represents the equalization curve within the audio file. [`AVMetadataIdentifierID3MetadataEqualization2`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEqualization2) An identifier that represents the equalization curve within the audio file. [`AVMetadataIdentifierID3MetadataEventTimingCodes`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataEventTimingCodes) An identifier that represents the timing codes used for synchronization with key events in a song or sound. [`AVMetadataIdentifierID3MetadataFileOwner`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataFileOwner) An identifier that represents the name of the owner or licensee of the file and it’s contents. [`AVMetadataIdentifierID3MetadataFileType`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataFileType) An identifier that represents the file type of the audio. [`AVMetadataIdentifierID3MetadataGeneralEncapsulatedObject`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataGeneralEncapsulatedObject) An identifier that represents the details of a file. [`AVMetadataIdentifierID3MetadataGroupIdentifier`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataGroupIdentifier) An identifier that represents the grouping of distinct frames. [`AVMetadataIdentifierID3MetadataInitialKey`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataInitialKey) An identifier that represents the musical key in which the sound starts. [`AVMetadataIdentifierID3MetadataInternationalStandardRecordingCode`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataInternationalStandardRecordingCode) An identifier that represents the international standard recording code. [`AVMetadataIdentifierID3MetadataInternetRadioStationName`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataInternetRadioStationName) An identifier that represents the name of the internet radio station streaming the audio. [`AVMetadataIdentifierID3MetadataInternetRadioStationOwner`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataInternetRadioStationOwner) An identifier that represents the name of the owner of the internet radio station streaming the audio. [`AVMetadataIdentifierID3MetadataInvolvedPeopleList_v23`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataInvolvedPeopleList_v23) An identifier that represents the list of names of contributors to the media. [`AVMetadataIdentifierID3MetadataInvolvedPeopleList_v24`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataInvolvedPeopleList_v24) An identifier that represents the list of names of contributors to the media. [`AVMetadataIdentifierID3MetadataLanguage`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataLanguage) An identifier that represents the language of the text or lyrics spoken or sung in the audio. [`AVMetadataIdentifierID3MetadataLeadPerformer`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataLeadPerformer) An identifier that represents the main artist of the recording. [`AVMetadataIdentifierID3MetadataLength`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataLength) An identifier that represents the length of the audio file in milliseconds. [`AVMetadataIdentifierID3MetadataLink`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataLink) An identifier that represents the link information from an ID3 tag that might reside in another audio file or alone in a binary file. [`AVMetadataIdentifierID3MetadataLyricist`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataLyricist) An identifier that represents the writer(s) of the text or lyrics in the recording. [`AVMetadataIdentifierID3MetadataMediaType`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataMediaType) An identifier that represents which media the sound originated from. [`AVMetadataIdentifierID3MetadataModifiedBy`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataModifiedBy) An identifier that represents the people behind a remix and similar interpretations of another existing piece. [`AVMetadataIdentifierID3MetadataMood`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataMood) An identifier that represents the mood of the audio. [`AVMetadataIdentifierID3MetadataMPEGLocationLookupTable`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataMPEGLocationLookupTable) An identifier that represents the lookup table used to increase performance and accuracy of jumps within an MPEG audio file. [`AVMetadataIdentifierID3MetadataMusicCDIdentifier`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataMusicCDIdentifier) An identifier that represents the ID used to identify the CD in databases such as the Compact Disc Database. [`AVMetadataIdentifierID3MetadataMusicianCreditsList`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataMusicianCreditsList) An identifier that represents the mapping between an instrument and the musician that played it. [`AVMetadataIdentifierID3MetadataOfficialArtistWebpage`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOfficialArtistWebpage) An identifier that represents the artist’s official webpage. [`AVMetadataIdentifierID3MetadataOfficialAudioFileWebpage`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOfficialAudioFileWebpage) An identifier that represents the official webpage for the audio file. [`AVMetadataIdentifierID3MetadataOfficialAudioSourceWebpage`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOfficialAudioSourceWebpage) An identifier that represents the official webpage for the source of the audio file. [`AVMetadataIdentifierID3MetadataOfficialInternetRadioStationHomepage`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOfficialInternetRadioStationHomepage) An identifier that represents the official homepage of the internet radio station. [`AVMetadataIdentifierID3MetadataOfficialPublisherWebpage`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOfficialPublisherWebpage) An identifier that represents the official webpage for the publisher. [`AVMetadataIdentifierID3MetadataOriginalAlbumTitle`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOriginalAlbumTitle) An identifier that represents the title of the original recording or source of sound. [`AVMetadataIdentifierID3MetadataOriginalArtist`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOriginalArtist) An identifier that represents the performer(s) of the original recording. [`AVMetadataIdentifierID3MetadataOriginalFilename`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOriginalFilename) An identifier that represents the original filename for the recording. [`AVMetadataIdentifierID3MetadataOriginalLyricist`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOriginalLyricist) An identifier that represents the text writer(s) of the original recording. [`AVMetadataIdentifierID3MetadataOriginalReleaseTime`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOriginalReleaseTime) An identifier that represents the release time for the original recording. [`AVMetadataIdentifierID3MetadataOriginalReleaseYear`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOriginalReleaseYear) An identifier that represents the release year for the original recording. [`AVMetadataIdentifierID3MetadataOwnership`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataOwnership) An identifier that represents the transaction details indicating proof of ownership if signed. [`AVMetadataIdentifierID3MetadataPartOfASet`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPartOfASet) An identifier that represents the part of a set the audio came from. [`AVMetadataIdentifierID3MetadataPayment`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPayment) An identifier that represents the webpage that handles the process of paying for the audio file. [`AVMetadataIdentifierID3MetadataPerformerSortOrder`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPerformerSortOrder) An identifier that represents the performer sort order. [`AVMetadataIdentifierID3MetadataPlayCounter`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPlayCounter) An identifier that represents the play count of the audio file. [`AVMetadataIdentifierID3MetadataPlaylistDelay`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPlaylistDelay) An identifier that represents the number of milliseconds of silence between every song in a playlist. [`AVMetadataIdentifierID3MetadataPopularimeter`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPopularimeter) An identifier that represents the rating for the audio file. [`AVMetadataIdentifierID3MetadataPositionSynchronization`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPositionSynchronization) An identifier that represents the time offset of the first frame in the stream. [`AVMetadataIdentifierID3MetadataPrivate`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPrivate) An identifier that represents the information from a software producer that its program uses. [`AVMetadataIdentifierID3MetadataProducedNotice`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataProducedNotice) An identifier that represents the produced notice. [`AVMetadataIdentifierID3MetadataPublisher`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataPublisher) An identifier that represents the name of the label or publisher. [`AVMetadataIdentifierID3MetadataRecommendedBufferSize`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataRecommendedBufferSize) An identifier that represents the buffer size the server recommends. [`AVMetadataIdentifierID3MetadataRecordingDates`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataRecordingDates) An identifier that represents additional recording dates that complement year, date, and time identifiers. [`AVMetadataIdentifierID3MetadataRecordingTime`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataRecordingTime) An identifier that represents the recording time. [`AVMetadataIdentifierID3MetadataRelativeVolumeAdjustment`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataRelativeVolumeAdjustment) An identifier that represents the increase or decrease of volume on each channel while the file plays. [`AVMetadataIdentifierID3MetadataRelativeVolumeAdjustment2`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataRelativeVolumeAdjustment2) An identifier that represents the increase or decrease of volume on each channel while the file plays. [`AVMetadataIdentifierID3MetadataReleaseTime`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataReleaseTime) An identifier that represents the time of the first release. [`AVMetadataIdentifierID3MetadataReverb`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataReverb) An identifier that represents the adjustments to echoes of different kinds. [`AVMetadataIdentifierID3MetadataSeek`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSeek) An identifier that represents the location of other tags in a file or stream. [`AVMetadataIdentifierID3MetadataSetSubtitle`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSetSubtitle) An identifier that represents the set subtitle the track belongs to. [`AVMetadataIdentifierID3MetadataSignature`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSignature) An identifier that represents the group of frames to sign. [`AVMetadataIdentifierID3MetadataSize`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSize) An identifier that represents the size of the audio file in bytes. [`AVMetadataIdentifierID3MetadataSubTitle`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSubTitle) An identifier that represents the information relating to the contents title. [`AVMetadataIdentifierID3MetadataSynchronizedLyric`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSynchronizedLyric) An identifier that represents the words in the audio file as text in sync with the audio. [`AVMetadataIdentifierID3MetadataSynchronizedTempoCodes`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataSynchronizedTempoCodes) An identifier that represents the tempo codes used for a more accurate description of the tempo of a musical piece. [`AVMetadataIdentifierID3MetadataTaggingTime`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataTaggingTime) An identifier that represents the time of tagging. [`AVMetadataIdentifierID3MetadataTermsOfUse`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataTermsOfUse) An identifier that represents the brief description of the terms of use and ownership of the file. [`AVMetadataIdentifierID3MetadataTime`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataTime) An identifier that represents the time for the recording. [`AVMetadataIdentifierID3MetadataTitleDescription`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataTitleDescription) An identifier that represents the name of the piece. [`AVMetadataIdentifierID3MetadataTitleSortOrder`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataTitleSortOrder) An identifier that represents the title sort order. [`AVMetadataIdentifierID3MetadataTrackNumber`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataTrackNumber) An identifier that represents the order number of the audio file. [`AVMetadataIdentifierID3MetadataUniqueFileIdentifier`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataUniqueFileIdentifier) An identifier that represents the identifier used to indicate the audio file in a database. [`AVMetadataIdentifierID3MetadataUnsynchronizedLyric`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataUnsynchronizedLyric) An identifier that represents the lyrics of the song or a text transcription of other vocal activities. [`AVMetadataIdentifierID3MetadataUserText`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataUserText) An identifier that represents the user text information frame. [`AVMetadataIdentifierID3MetadataUserURL`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataUserURL) An identifier that represents the user webpage frame. [`AVMetadataIdentifierID3MetadataYear`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataYear) An identifier that represents the year of the recording. [`AVMetadataIdentifierID3MetadataCommerical`](/documentation/AVFoundation/AVMetadataIdentifier/id3MetadataCommerical) An identifier that represents the commerical frame. ### 3GP user metadata identifiers [`AVMetadataIdentifier3GPUserDataAlbumAndTrack`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataAlbumAndTrack) An identifier that represents the text for the album and track titles. [`AVMetadataIdentifier3GPUserDataAuthor`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataAuthor) An identifier that represents the author of the media. [`AVMetadataIdentifier3GPUserDataCollection`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataCollection) An identifier that represents the collection name for the media. [`AVMetadataIdentifier3GPUserDataCopyright`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataCopyright) An identifier that represents the copyright statement. [`AVMetadataIdentifier3GPUserDataDescription`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataDescription) An identifier that represents the description for the media. [`AVMetadataIdentifier3GPUserDataGenre`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataGenre) An identifier that represents the genre of the media. [`AVMetadataIdentifier3GPUserDataKeywordList`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataKeywordList) An identifier that represents the list of keywords for the media. [`AVMetadataIdentifier3GPUserDataLocation`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataLocation) An identifier that represents the location information for the media. [`AVMetadataIdentifier3GPUserDataMediaClassification`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataMediaClassification) An identifier that represents the classification of the media content. [`AVMetadataIdentifier3GPUserDataMediaRating`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataMediaRating) An identifier that represents the rating of the media content. [`AVMetadataIdentifier3GPUserDataPerformer`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataPerformer) An identifier that represents information about the performer. [`AVMetadataIdentifier3GPUserDataRecordingYear`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataRecordingYear) An identifier that represents the recording year for the media. [`AVMetadataIdentifier3GPUserDataThumbnail`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataThumbnail) An identifier that represents the media thumbnail. [`AVMetadataIdentifier3GPUserDataTitle`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataTitle) An identifier that represents the title for the media. [`AVMetadataIdentifier3GPUserDataUserRating`](/documentation/AVFoundation/AVMetadataIdentifier/identifier3GPUserDataUserRating) An identifier that represents the user rating. ### ISO metadata identifiers [`AVMetadataIdentifierISOUserDataAccessibilityDescription`](/documentation/AVFoundation/AVMetadataIdentifier/isoUserDataAccessibilityDescription) An identifier that represents the accessibility description for the media content. [`AVMetadataIdentifierISOUserDataCopyright`](/documentation/AVFoundation/AVMetadataIdentifier/isoUserDataCopyright) An identifier that represents the copyright statement. [`AVMetadataIdentifierISOUserDataDate`](/documentation/AVFoundation/AVMetadataIdentifier/isoUserDataDate) An identifier that represents the date for the media content. [`AVMetadataIdentifierISOUserDataTaggedCharacteristic`](/documentation/AVFoundation/AVMetadataIdentifier/isoUserDataTaggedCharacteristic) An identifier that represents the tagged media characteristic used for identifying accessibility features. ### ICY metadata identifiers [`AVMetadataIdentifierIcyMetadataStreamTitle`](/documentation/AVFoundation/AVMetadataIdentifier/icyMetadataStreamTitle) An identifier that represents the title of a stream. [`AVMetadataIdentifierIcyMetadataStreamURL`](/documentation/AVFoundation/AVMetadataIdentifier/icyMetadataStreamURL) An identifier that represents the web address of a stream. ### Initializers [`init(_:)`](/documentation/AVFoundation/AVMetadataIdentifier/init(_:)) Creates a metadata identifier. [`init(rawValue:)`](/documentation/AVFoundation/AVMetadataIdentifier/init(rawValue:)) Creates a metadata identifier with the specified raw value. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`Equatable`](/documentation/Swift/Equatable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`RawRepresentable`](/documentation/Swift/RawRepresentable) [`Hashable`](/documentation/Swift/Hashable) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)