Boxes (Atoms)
This sub-section documents the structural atom or box types for the file formats. All files in this family are structured as a series of boxes (also known as atoms). Each box has a size and a four-character-code type. Boxes may contain other boxes.
User-data types are in a separate table below.
ISO family codes
See below for additional QuickTime codes.
code | description | specification |
|---|---|---|
2dqr | 2D region quality ranking | OMAF |
2dss | spatial relationship 2D source | OMAF |
ainf | Asset information to identify, license and play | DECE |
assp | alternative startup sequence properties | ISO |
auxi | Auxiliary track type information | HEIF |
avcn | AVC NAL Unit Storage Box | DECE |
bidx | Box Index | ISO-Partial |
bloc | Base location and purchase location for license acquisition | DECE |
bmdm | Buffer Model Description | JPXS |
bpcc | Bits per component | JPEG2000 |
brob | Brotli-compressed box | JPEG XL |
buff | Buffering information | NALu Video |
bxml | binary XML container | ISO |
ccid | OMA DRM Content ID | OMA DRM 2.1 |
ccst | Coding constraints box | HEIF |
cdef | type and ordering of the components within the codestream | JPEG2000 |
cinf | complete track information | ISO |
clip | Reserved | ISO |
cmap | mapping between a palette and codestream components | JPEG2000 |
co64 | 64-bit chunk offset | ISO |
coif | composition information | OMAF |
coin | Content Information Box | DECE |
colr | specifies the colourspace of the image | JPEG2000 |
covi | coverage information | OMAF |
crgn | Reserved | ISO |
crhd | reserved for ClockReferenceStream header | MP4v2 |
csgp | compact sample to group | ISO |
cslg | composition to decode timeline mapping | ISO |
cstb | corrected wall clock start time | ONVIF |
ctab | Reserved | ISO |
ctts | (composition) time to sample | ISO |
cvru | OMA DRM Cover URI | OMA DRM 2.1 |
dihd | Data Integrity Hash | ISO-Partial |
dinf | data information box, container | ISO |
dint | Data Integrity | ISO-Partial |
dmon | Mastering Display Metadata | JPXS |
dref | data reference box, declares source(s) of media data in track | ISO |
dsgd | DVB Sample Group Description Box | DVB |
dstg | DVB Sample to Group Box | DVB |
edts | edit list container | ISO |
elst | an edit list | ISO |
emsg | event message | DASH |
evti | Event information | ATSC 3.0 A337 |
etyp | extended type and type combination | ISO |
Exif | Exif Metadata | JPXS |
fdel | File delivery information (item info extension) | ISO |
feci | FEC Informatiom | ISO |
fecr | FEC Reservoir | ISO |
fidx | Box File Index | ISO-Partial |
fiin | FD Item Information | ISO |
fire | File Reservoir | ISO |
fovd | fisheye omnidirectional video | OMAF |
fovi | fisheye video essential info | OMAF |
fpar | File Partition | ISO |
free | free space | ISO |
frma | original format box | ISO |
frpa | Front Part | ISO-Partial |
ftyp | file type and compatibility | ISO |
fvsi | fisheye video supplemental info | OMAF |
gitn | Group ID to name | ISO |
grpi | OMA DRM Group ID | OMA DRM 2.0 |
grpl | Groups list box | ISO |
hdlr | handler, declares the media (handler) type | ISO |
hmhd | hint media header, overall information (hint track only) | ISO |
hpix | Hipix Rich Picture (user-data or meta-data) | Hipix |
icnu | OMA DRM Icon URI | OMA DRM 2.0 |
ID32 | ID3 version 2 container | id3v2 |
idat | Item data | ISO |
ihdr | Image Header | JPEG2000 |
iinf | item information | ISO |
iloc | item location | ISO |
imap | Reserved | ISO |
imda | Identified media data | ISO |
imif | IPMP Information box | ISO |
infe | Item information entry | ISO |
infu | OMA DRM Info URL | OMA DRM 2.0 |
iods | Object Descriptor container box | MP4v2 |
ipco | ItemPropertyContainerBox | ISO |
iphd | reserved for IPMP Stream header | MP4v2 |
ipma | ItemPropertyAssociation | ISO |
ipmc | IPMP Control Box | ISO |
ipro | item protection | ISO |
iprp | Item Properties Box | ISO |
iref | Item reference | ISO |
j2kH | JPEG 2000 header info | J2KHEIF |
j2kP | JPEG 2000 prefix | J2KHEIF |
jbrd | JPEG bitstream reconstruction data | JPEG XL |
jP$20$20 | JPEG 2000 Signature | JPEG2000 |
jp2c | JPEG 2000 contiguous codestream | JPEG2000 |
jp2h | Header | JPEG2000 |
jp2i | intellectual property information | JPEG2000 |
jumb | JPEG Universal Metadata Box Format (JUMBF) | JPEG Systems |
JXL$20 | JPEG XL Signature | JPEG XL |
jxll | JPEG XL Level | JPEG XL |
jxlc | JPEG XL Codestream | JPEG XL |
jxli | JPEG XL Frame Index | JPEG XL |
jxlp | JPEG XL Partial Codestream | JPEG XL |
jpvi | JPEG XS Video Information | JPXS |
jpvs | JPEG XS Video Support | JPXS |
jptp | JPEG XS Video Transport Parameter | JPXS |
JXS$20 | JPEG XS Signature | JPXS |
jxpl | JPEG XS Profile and Level | JPXS |
kmat | Reserved | ISO |
leva | Leval assignment | ISO |
load | Reserved | ISO |
loop | Looping behavior | |
lrcu | OMA DRM Lyrics URI | OMA DRM 2.1 |
m7hd | reserved for MPEG7Stream header | MP4v2 |
matt | Reserved | ISO |
md5i | MD5IntegrityBox | HEIF |
mdat | media data container | ISO |
mdhd | media header, overall information about the media | ISO |
mdia | container for the media information in a track | ISO |
mdri | Mutable DRM information | OMA DRM 2.0 |
meco | additional metadata container | ISO |
mehd | movie extends header box | ISO |
meof | media offset | OMAF |
mere | metabox relation | ISO |
mesh | mesh box | OMAF |
meta | Metadata container | ISO |
mfhd | movie fragment header | ISO |
mfra | Movie fragment random access | ISO |
mfro | Movie fragment random access offset | ISO |
minf | media information container | ISO |
mjhd | reserved for MPEG-J Stream header | MP4v2 |
mmvi | multimap video | V3C-SYS |
moof | movie fragment | ISO |
moov | container for all the meta-data | ISO |
movd | mesh omnidirectional video | OMAF |
mstv | MVC sub track view box | NALu Video |
mvcg | Multiview group | NALu Video |
mvci | Multiview Information | NALu Video |
3dpr | MVDDepthResolutionBox | NALu Video |
mvex | movie extends box | ISO |
mvhd | movie header, overall declarations | ISO |
mvra | Multiview Relation Attribute | NALu Video |
nmhd | Null media header, overall information (some tracks only) | ISO |
ochd | reserved for ObjectContentInfoStream header | MP4v2 |
odaf | OMA DRM Access Unit Format | OMA DRM 2.0 |
odda | OMA DRM Content Object | OMA DRM 2.0 |
odhd | reserved for ObjectDescriptorStream header | MP4v2 |
odhe | OMA DRM Discrete Media Headers | OMA DRM 2.0 |
odrb | OMA DRM Rights Object | OMA DRM 2.0 |
odrm | OMA DRM Container | OMA DRM 2.0 |
odtt | OMA DRM Transaction Tracking | OMA DRM 2.0 |
ohdr | OMA DRM Common headers | OMA DRM 2.0 |
otcf | OMAF timed text configuration | OMAF |
otyp | Original file type | ISO |
ovly | overlay configuration | OMAF |
padb | sample padding bits | ISO |
paen | Partition Entry | ISO |
pclr | palette which maps a single component in index space to a multiple- component image | JPEG2000 |
pdat | Partial Data | ISO-Partial |
pdin | Progressive download information | ISO |
pfhd | Partial File Header | ISO-Partial |
pfil | Partial File | ISO-Partial |
pitm | primary item reference | ISO |
ploc | Partial Segment Location | ISO-Partial |
pnot | Reserved | ISO |
povd | projected omnidirectional video | OMAF |
prfr | projection format | OMAF |
prft | Producer reference time | ISO |
pseg | Partial Segment | ISO-Partial |
pshd | Partial Segment Header | ISO-Partial |
pssh | Protection system specific header | ISO Common Encryption |
ptle | Partial Top Level Entry | ISO-Partial |
res$20 | grid resolution | JPEG2000 |
resc | grid resolution at which the image was captured | JPEG2000 |
resd | default grid resolution at which the image should be displayed | JPEG2000 |
rinf | restricted scheme information box | ISO |
rotn | rotation box | OMAF |
rosc | sphere region configuration | OMAF |
rvif | recommended viewport information | OMAF |
rwpk | region-wise packing | OMAF |
saio | Sample auxiliary information offsets | ISO |
saiz | Sample auxiliary information sizes | ISO |
sbgp | Sample to Group box | ISO |
schi | scheme information box | ISO |
schm | scheme type box | ISO |
sdep | Sample dependency | NALu Video |
sdhd | reserved for SceneDescriptionStream header | MP4v2 |
sdtp | Independent and Disposable Samples Box | ISO |
sdvp | SD Profile Box | SDV |
segr | file delivery session group | ISO |
seii | SEI information box | NALu Video |
senc | Sample specific encryption data | ISO Common Encryption |
sgpd | Sample group definition box | ISO |
sidx | Segment Index Box | ISO |
sinf | protection scheme information box | ISO |
skip | free space | ISO |
smhd | sound media header, overall information (sound track only) | ISO |
sprg | sub-picture region | OMAF |
srmb | System Renewability Message | DVB |
srmc | System Renewability Message container | DVB |
srpp | STRP Process | ISO |
srqr | sphere region quality ranking | OMAF |
ssix | Sub-sample index | ISO |
sstl | SVC sub track layer box | NALu Video |
stbl | sample table box, container for the time/space map | ISO |
stco | chunk offset, partial data-offset information | ISO |
stdp | sample degradation priority | ISO |
sthd | Subtitle Media Header Box | ISO |
stmg | MVC sub track multiview group box | NALu Video |
strd | Sub-track definition | ISO |
stri | Sub-track information | ISO |
stsc | sample-to-chunk, partial data-offset information | ISO |
stsd | sample descriptions (codec types, initialization etc.) | ISO |
stsg | Sub-track sample grouping | ISO |
stsh | shadow sync sample table | ISO |
stss | sync sample table (random access points) | ISO |
stsz | sample sizes (framing) | ISO |
stti | Sub track tier box | NALu Video |
stts | (decoding) time-to-sample | ISO |
styp | Segment Type Box | ISO |
stz2 | compact sample sizes (framing) | ISO |
subs | Sub-sample information | ISO |
suep | signer identity information | ONVIF |
sumi | supplemental surveillance meta information | MPEG-VSAF |
surl | Source URL | ISO-Partial |
swtc | Multiview Group Relation | NALu Video |
tenc | Track Encryption | ISO Common Encryption |
tfad | Track fragment adjustment box | 3GPP |
tfdt | Track fragment decode time | ISO |
tfhd | Track fragment header | ISO |
tfma | Track fragment media adjustment box | 3GPP |
tfra | Track fragment radom access | ISO |
tibr | Tier Bit rate | NALu Video |
tiri | Tier Information | NALu Video |
tkhd | Track header, overall information about the track | ISO |
traf | Track fragment | ISO |
trak | container for an individual track or stream | ISO |
tref | track reference container | ISO |
trep | track extension properties | ISO |
trex | track extends defaults | ISO |
trgr | Track grouping information | ISO |
trik | Facilitates random access and trick play modes | DECE |
trun | track fragment run | ISO |
tstb | TileSubTrackGroupBox | NALu Video |
ttyp | track type and compatibility | ISO |
tyco | type and-combination | ISO |
udta | user-data | ISO |
uinf | a tool by which a vendor may provide access to additional information associated with a UUID | JPEG2000 |
UITS | Unique Identifier Technology Solution | Universal Music Group |
ulst | a list of UUID’s | JPEG2000 |
url$20 | a URL | JPEG2000 |
uuid | user-extension box | ISO |
v3sc | V3C spatial region collection | V3C-SYS |
vmhd | video media header, overall information (video track only) | ISO |
vpbb | Volumetric media bounding box | V3C-SYS |
vssn | viewing space | OMAF |
vunt | V3C unit header | V3C-SYS |
vvhd | volumetric visual media header | ISO |
vwdi | Multiview Scene Information | NALu Video |
wmpi | segment position in the watermark pattern | DASH-IF watermarking |
xml$20 | XML container | ISO |
xml$20 | a tool by which vendors can add XML formatted information | JPEG2000 |
!mof | Compressed movie fragment | ISO |
!mov | Compressed movie | ISO |
!six | Compressed segment index | ISO |
!ssx | Compressed subsegment index | ISO |
iroi | SVC region of interest box | NALu Video |
ldep | Tier dependency box | NALu Video |
rrgn | SVC rect region box | NALu Video |
svdr | SVC dependency range | NALu Video |
svip | Initial parameter sets box for tiers | NALu Video |
svpr | Priority range | NALu Video |
tran | SVC lightweight transcoding | NALu Video |
vipr | View priority Box | NALu Video |
sdp$20 | SDP information | ISO |
stvi | Stereo Video Box | ISO |
User-data Codes
code | description | specification |
|---|---|---|
ades | description of the content for accessibility purposes (similar to the HTML alt attribute); formatted as for the cprt user-data item | Apple |
albm | Album title and track number for media | 3GPP |
alou | Album loudness base | ISO |
angl | Name of the camera angle through which the clip was shot | Apple |
auth | Author of the media | 3GPP |
clfn | Name of the clip file | Apple |
clid | Identifier of the clip | Apple |
clsf | Classification of the media | 3GPP |
cmid | Identifier of the camera | Apple |
cmnm | Name that identifies the camera | Apple |
coll | Name of the collection from which the media comes | 3GPP |
cprt | copyright etc. | ISO |
date | Date and time, formatted according to ISO 8601, when the content was created. For clips captured by recording devices, this is typically the date and time when the clip’s recording started. | Apple |
dscp | Media description | 3GPP |
gnre | Media genre | 3GPP |
hinf | hint information | ISO |
hnti | Hint information | ISO |
hpix | Hipix Rich Picture (user-data or meta-data) | Hipix |
kind | Track kind | ISO |
kywd | Media keywords | 3GPP |
loci | Media location information | 3GPP |
ludt | Track loudness container | ISO |
manu | Manufacturer name of the camera | Apple |
modl | Model name of the camera | Apple |
orie | Orientation information | 3GPP |
perf | Media performer name | 3GPP |
prmd | Production metadata box | Youtube |
reel | Name of the tape reel | Apple |
rtng | Media rating | 3GPP |
scen | Name of the scene for which the clip was shot | Apple |
shot | Name that identifies the shot | Apple |
slno | Serial number of the camera | Apple |
strk | Sub track information | ISO |
thmb | Thumbnail image of the media | 3GPP |
titl | Media title | 3GPP |
tlou | Track loudness base | ISO |
tsel | Track selection | ISO |
urat | User 'star' rating of the media | 3GPP |
yrrc | Year when media was recorded | 3GPP |
swre | Name and version number of the software that generated this movie | Apple |
QuickTime Codes
code | description | specification |
|---|---|---|
albm | Album title and track number (user-data) | 3GPP |
auth | Media author name (user-data) | 3GPP |
clip | Visual clipping region container | QT |
clsf | Media classification (user-data) | 3GPP |
cprt | copyright etc. (user-data) | ISO |
crgn | Visual clipping region definition | QT |
csgm | Compact sample to group used in QuickTime File Format | QT |
ctab | Track color-table | QT |
dcfD | Marlin DCF Duration, user-data atom type | OMArlin |
elng | Extended Language Tag | QT |
imap | Track input map definition | QT |
kmat | Compressed visual track matte | QT |
load | Track pre-load definitions | QT |
matt | Visual track matte for compositing | QT |
pnot | Preview container | QT |
wide | Expansion space reservation | QT |