Boxes/atoms format - Revision history

Thorsted: /* Brand cross-reference */

2023-09-14T23:24:13Z

‎Brand cross-reference

Thorsted: /* Brand cross-reference */

2019-12-05T22:04:30Z

‎Brand cross-reference

Jsummers: /* UUID boxes */

2019-11-17T14:40:08Z

‎UUID boxes

Jsummers: /* Brand cross-reference */

2018-04-16T14:23:15Z

‎Brand cross-reference

Jsummers at 13:28, 11 April 2018

2018-04-11T13:28:41Z

Jsummers: Deleted note about "QT Atom", etc. I don't think it's helpful.

2018-04-11T13:23:25Z

Deleted note about "QT Atom", etc. I don't think it's helpful.

Jsummers: /* Brands */

2016-01-01T18:44:43Z

‎Brands

Jsummers: /* Brands */

2016-01-01T18:28:38Z

‎Brands

Jsummers: /* Format */

2015-12-26T17:35:59Z

‎Format

Jsummers: /* UUID boxes */

2015-12-24T18:56:33Z

‎UUID boxes

@@ Line 83: / Line 83: @@
 |-
 |<code>crx</code>   || || [[Canon RAW 3]]
 |}

@@ Line 81: / Line 81: @@
 |-
 |<code>qt</code>   || || [[QuickTime]]
 |}

@@ Line 97: / Line 97: @@
 |<code>2c4c0100-8504-40b9-a03e-562148d6dfeb</code> || [[Photoshop Image Resources]] || ExifTool
 |-
-|<code>33c7a4d2-b81d-4723-a0ba-f1a3e097ad38</code> || [[IPTC]]
+|<code>33c7a4d2-b81d-4723-a0ba-f1a3e097ad38</code> || [[IPTC-IIM]]
 |-
 |<code>8974dbce-7be7-4c51-84f9-7148f9882554</code> || [[Protected Interoperable File Format|PIFF]] Track Encryption Box || PIFF specification

@@ Line 54: / Line 54: @@
 |<code>heic</code> || || [[HEIF]]
 |-
-|<code>iso2</code> || || [[ISO Base Media File Format]]
+|<code>isom</code><br><code>iso2</code><br><code>iso[3-9]</code> || || [[ISO Base Media File Format]]
-|-
-|<code>isom</code> || || [[ISO Base Media File Format]]
 |-
 |<code>jp2</code>  || || [[JP2]]

@@ Line 3: / Line 3: @@
 |subcat=Metaformats
 }}
-'''Boxes/atoms format''' is our name for the metaformat used by [[JPEG 2000]], [[QuickTime]], and other formats. It is a tagged, segmented, hierarchical format, similar to [[IFF]] and [[RIFF]]. In some descriptions of it, the primary data structure is called a ''box'', and in others it's called an ''atom''.
+'''Boxes/atoms format''' is our name for the metaformat used by [[JPEG 2000]], [[QuickTime]], and other formats. (We also call it '''Box file format''', which is apparently the name used by [[JPEG XT]].) It is a tagged, segmented, hierarchical format, similar to [[IFF]] and [[RIFF]]. In some descriptions of it, the primary data structure is called a ''box'', and in others it's called an ''atom''.
-== Format ==
+== Format details ==
 A file consists of a sequence of one or more boxes. Some boxes contain data, and some contain other boxes. The only way to tell which is which is to have knowledge of the specific application format.
@@ Line 30: / Line 30: @@
 == Brands ==
-Some (but not all) boxes/atoms-based formats use an "<code>ftyp</code>" box, and along with it a concept called "brands". A brand is a [[FourCC|four-letter code]] representing a format or subformat. Each file has a ''major brand'' (or ''primary brand''), and also a ''compatibility list'' of brands. A brand's presence in the compatibility list indicates that a decoder which supports that brand can usefully decode the file in some way, even if it doesn't fully support it. This can be useful, though it makes it more complicated to explain just exactly what format a given file is in.
+Most (but not all) boxes/atoms-based formats use an "<code>ftyp</code>" box, and along with it a concept called "brands". A brand is a [[FourCC|four-letter code]] representing a format or subformat. Each file has a ''major brand'' (or ''primary brand''), and also a ''compatibility list'' of brands. A brand's presence in the compatibility list indicates that a decoder which supports that brand can usefully decode the file in some way, even if it doesn't fully support it. This can be useful, though it makes it more complicated to explain just exactly what format a given file is in.
 * [http://www.mp4ra.org/filetype.html List of registered brands]
@@ Line 47: / Line 47: @@
 |-
 |<code>avc1</code> || || [[AVC (file format)]]
 |-
 |<code>f4v</code>  || || [[F4V]]
 |-
 |<code>iso2</code> || || [[ISO Base Media File Format]]
@@ Line 66: / Line 70: @@
 |<code>M4A</code>  || || [[AAC]]
 |-
-|<code>mp41</code> || || [[MP4]]
+|<code>mif1</code> || || [[HEIF]]
-|-
-|<code>mp42</code> || || [[MP4]]
 |-
 |<code>mj2s</code> || MJ2 Simple Profile || [[MJ2]]
 |-
 |<code>mjp2</code> || || [[MJ2]]
 |-
 |<code>piff</code> || || [[Protected Interoperable File Format]]
@@ Line 113: / Line 119: @@
 * [[MP4]]
 * [[QuickTime]]

@@ Line 33: / Line 33: @@
 == Brands ==
-Some (but not all) boxes/atoms-based formats use an "<code>ftyp</code>" box, and along with it a concept called "brands". A brand is a four-letter code representing a format or subformat. Each file has a ''primary brand'', and also a ''compatibility list'' of brands. A brand's presence in the compatibility list indicates that a decoder which supports that brand can usefully decode the file in some way, even if it doesn't fully support it. This can be useful, though it makes it more complicated to explain just exactly what format a given file is in.
+Some (but not all) boxes/atoms-based formats use an "<code>ftyp</code>" box, and along with it a concept called "brands". A brand is a [[FourCC|four-letter code]] representing a format or subformat. Each file has a ''primary brand'', and also a ''compatibility list'' of brands. A brand's presence in the compatibility list indicates that a decoder which supports that brand can usefully decode the file in some way, even if it doesn't fully support it. This can be useful, though it makes it more complicated to explain just exactly what format a given file is in.
 * [http://www.mp4ra.org/filetype.html List of registered brands]
 == UUID boxes ==

@@ Line 11: / Line 11: @@
 A file consists of a sequence of one or more boxes. Some boxes contain data, and some contain other boxes. The only way to tell which is which is to have knowledge of the specific application format.
-A box begins with a header of either 8 or (rarely) 16 bytes. The first four bytes of the header are a field we'll call ''size32''. The next four are the ''Box Type'' code, usually corresponding to four ASCII characters. Sometimes the Box Type field is followed by an 8-byte ''size64'' field. Following the header is the payload data.
+A box begins with a header of either 8 or (rarely) 16 bytes. The first four bytes of the header are a field we'll call ''size32''. The next four are the ''Box Type'' code, usually corresponding to [[FourCC|four ASCII characters]]. Sometimes, the Box Type field is followed by an 8-byte ''size64'' field. Following the header is the payload data.
 The ''size'' fields use big-endian [[Endianness|byte order]]. They include the size of the header. The size of a box's payload data is determined as follows:

@@ Line 52: / Line 52: @@
 |-
 |<code>33c7a4d2-b81d-4723-a0ba-f1a3e097ad38</code> || [[IPTC]]
 |-
 |<code>96a9f1f1-dc98-402d-a7ae-d68e34451809</code> || [[GeoJP2]] World File Box || GeoJP2 specification
 |-
 |<code>b14bf8bd-083d-4b43-a5ae-8cd7d5a6ce03</code> || [[GeoJP2]] GeoTIFF Box || GeoJP2 specification
 |-
 |<code>be7acfcb-97a9-42e8-9c71-999491e3afac</code> || [[XMP]] || XMP specification
 |}