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Showing content from https://sno.phy.queensu.ca/~phil/exiftool/TagNames/QuickTime.html below:

QuickTime Tags

The QuickTime format is used for many different types of audio, video and image files (most notably, MOV/MP4 videos and HEIC/CR3 images). ExifTool extracts standard meta information and a variety of audio, video and image parameters, as well as proprietary information written by many camera models. Tags with a question mark after their name are not extracted unless the Unknown option is set.

When writing video files, ExifTool creates both QuickTime and XMP tags by default, but the group may be specified to write one or the other separately. If no location is specified, newly created QuickTime tags are added in the ItemList location if possible, otherwise in UserData, and finally in Keys, but this order may be changed by setting the PREFERRED level of the appropriate table in the config file (see example.config in the full distribution for an example). Note that some tags with the same name but different ID's may exist in the same location, but the family 7 group names may be used to differentiate these.

ExifTool currently writes ItemList and UserData only as top-level metadata, but select Keys tags are may be written to the audio or video track. See the AudioKeys and VideoKeys tags for more information.

Alternate language tags may be accessed for ItemList and Keys tags by adding a 3-character ISO 639-2 language code and an optional ISO 3166-1 alpha 2 country code to the tag name (eg. "ItemList:Artist-deu" or "ItemList::Artist-deu-DE"). Most UserData tags support a language code, but without a country code. If no language code is specified when writing, the default language is written and alternate languages for the tag are deleted. Use the "und" language code to write the default language without deleting alternate languages. Note that when reading, "eng" is also treated as the default language if there is no country code.

According to the specification, integer-format QuickTime date/time tags should be stored as UTC. Unfortunately, digital cameras often store local time values instead (presumably because they don't know the time zone). For this reason, by default ExifTool does not assume a time zone for these values. However, if the API QuickTimeUTC option is set, then ExifTool will assume these values are properly stored as UTC, and will convert them to local time when extracting.

When writing string-based date/time tags, the system time zone is added if the PrintConv option is enabled and no time zone is specified. This is because Apple software may display crazy values if the time zone is missing for some tags.

By default ExifTool will remove null padding from some QuickTime containers in Canon CR3 files when writing, but the QuickTimePad option may be used to preserve the original size by padding with nulls if necessary.

The tags below are extracted from timed metadata in QuickTime and other formats of video files when the ExtractEmbedded option is used. Although most of these tags are combined into the single table below, ExifTool currently reads 110 different types of timed GPS metadata from video files.

GPS information extracted from the RVMI box of MOV videos.

G-sensor information extracted from the RVMI box of MOV videos.

This directory contains a list of key names which are used to decode tags written by the "mdta" handler. Also in this table are a few tags found in timed metadata that are not yet writable by ExifTool. The prefix of "com.apple.quicktime." has been removed from the TagID's below. These tags support alternate languages in the same way as the ItemList tags. Note that by default, ItemList and UserData tags are preferred when writing, so to create a tag when a same-named tag exists in either of these tables, either the "Keys" location must be specified (eg. -Keys:Author=Phil on the command line), or the PREFERRED level must be changed via the config file.

Keys tags written in the audio track by some Apple devices. These tags belong to the ExifTool AudioKeys family 1 gorup.

Keys tags written in the video track. These tags belong to the ExifTool VideoKeys family 1 gorup.

Preview stored by TomTom Bandit ActionCam.

Tags extracted from the tx3g sbtl timed metadata of Yuneec and Autel drones, and subtitle text in some other videos.

Tags written by some HTC camera phones.

Tags found in Pittasoft Blackvue dashcam "free" data.

MP4 data information box.

MP4 data reference box.

This is the preferred location for creating new QuickTime tags. Tags in this table support alternate languages which are accessed by adding a 3-character ISO 639-2 language code and an optional ISO 3166-1 alpha 2 country code to the tag name (eg. "ItemList:Title-fra" or "ItemList::Title-fra-FR"). When creating a new Meta box to contain the ItemList directory, by default ExifTool adds an 'mdir' (Metadata) Handler box because Apple software may ignore ItemList tags otherwise, but the API QuickTimeHandler option may be set to 0 to avoid this.

ExifTool will extract any iTunesInfo tags that exist, even if they are not defined in this table. These tags belong to the family 1 "iTunes" group, and are not currently writable.

The Item reference entries listed in the table below contain information about the associations between items in the file. This information is used by ExifTool, but these entries are not extracted as tags.

MP4 media box.

MP4 media info box.

MP4 hint media header.

MP4 audio media header.

MP4 sample table box.

MP4 audio sample description. This hybrid atom contains both data and child atoms.

Spatial Audio tags.

Audio channel layout.

Child atoms found in "sinf" and/or "pinf" atoms.

MP4 hint sample description.

MP4 metadata sample description.

MP4 video media header.

Tag ID's beginning with the copyright symbol (hex 0xa9) are multi-language text. Alternate language tags are accessed by adding a dash followed by a 3-character ISO 639-2 language code to the tag name. ExifTool will extract any multi-language user data tags found, even if they aren't in this table. Note when creating new tags, ItemList tags are preferred over these, so to create the tag when a same-named ItemList tag exists, either "UserData" must be specified (eg. -UserData:Artist=Monet on the command line), or the PREFERRED level must be changed via the config file.

Tags found in TomTom Bandit Action Cam MP4 videos.

Tags found in 'infi' atom from some Nextbase videos. As well as these tags, other existing tags are also extracted. These tags are not currently writable but they may all be removed by deleting the Nextbase group.

Found in MP4 files from Flip Video cameras.

Timed metadata found in MP4 videos from the 360Fly.

Tags used in QTIF QuickTime Image Files.

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