Codecs

This section documents the code-points used to identify codecs, or sample (access unit) formats. These are the four-character codes of sample entries (sample descriptions) in ISO media files.

There is also a table of boxes that are stored in the sample entries for various track types.

Requests for a code-point in this area should identify the specification of the coding system, as well as the specification where the code-point is defined. The definition of the code-point should document the sample (access unit) format as well as the sample entry (sample description) format. Note that extra boxes (atoms) within the sample entry, which are specific to that coding system, need not be, and usually are not, registered.

Requests for a code-point in this area will normally also cause an objectTypeIndication to be allocated, so that the coding system can be used in MPEG-4 systems. Please indicate if this is not desirable.

Note well: the existence of an ObjectType identification here does not document in which contexts, if any, that code-point may be used. The documentation must be consulted.

Sample Entry Codes Registered to ISO

see below for QuickTime code points

code
description
handler
specification
ObjectType
2dcc
2D cartesian coordinates
Metadata
Metrics
3glo
3GPP Location
Metadata
3GPP
3gor
3GPP Orientation
Metadata
3GPP
3gvo
3GPP Video Orientation
Metadata
3GPP
6vpt
Dynamic viewport data
Volumetric visual media
V3C-SYS
a3d1
3D-AVC track with 3D-AVC NAL units only
Video
NALu Video
a3d2
3D-AVC track with 3D-AVC NAL units only
Video
NALu Video
a3d3
3D-AVC track with 3D-AVC NAL units only
Video
NALu Video
a3d4
3D-AVC track with 3D-AVC NAL units only
Video
NALu Video
a3ds
Auro-Cx 3D audio
Audio
Auro
0xAF
ac-3
AC-3 audio
Audio
ETSI AC-3
0xA5
ac-4
AC-4 audio
Audio
ETSI AC-4
0xAE
alac
Apple lossless audio codec
Audio
Apple
alaw
a-Law
Audio
QT
av01
AOM Video Codec
Video
AV1-ISOBMFF
avc1
Advanced Video Coding
Video
NALu Video
0x21
avc2
Advanced Video Coding
Video
NALu Video
0x21
avc3
Advanced Video Coding
Video
NALu Video
0x21
avc4
Advanced Video Coding
Video
NALu Video
0x21
avcp
Advanced Video Coding Parameters
Video
NALu Video
0x22
avst
2nd Generation Audio Video Coding Standard of China (AVS Two)
Video
Avs2
avs3
3nd Generation Audio Video Coding Standard of China
Video
Avs3
camm
Camera motion metadata track
Video
CamMotion
cavs
AVS2-P3 codec
Audio
GB-T-20090-9
0xF0
dav1
AV1-related Dolby Vision consistent with av01
Video
Dolby Vision
dra1
DRA Audio
Audio
DRA
0xA7
drac
Dirac Video Coder
Video
Dirac
0xA4
dts+
Enhancement layer for DTS layered audio
Audio
DTS
dts-
Dependent base layer for DTS layered audio
Audio
DTS
dtsc
Core Substream
Audio
DTS-HD
0xA9
dtse
Extension Substream containing only LBR
Audio
DTS-HD
0xAC
dtsh
Core Substream + Extension Substream
Audio
DTS-HD
0xAA
dtsl
Extension Substream containing only XLL
Audio
DTS-HD
0xAB
dtsx
DTS-UHD profile 2
Audio
DTS-UHD
0xB2
dtsy
DTS-UHD profile 3 or higher
Audio
DTS-UHD
0xB3
dva1
AVC-based Dolby Vision derived from avc1
Video
Dolby Vision
dvav
AVC-based Dolby Vision derived from avc3
Video
Dolby Vision
dvh1
HEVC-based Dolby Vision derived from hvc1
Video
Dolby Vision
dvhe
HEVC-based Dolby Vision derived from hev1
Video
Dolby Vision
dyol
Dynamic overlay parameters
Metadata
OMAF
dyvm
Dynamic spatial region data
Volumetric visual media
V3C-SYS
dyvp
Dynamic viewpoint parameters
Metadata
OMAF
ec-3
Enhanced AC-3 audio
Audio
ETSI AC-3
0xA6
ec+3
withdrawn, unused, do not use (was enhanced AC-3 audio with JOC)
Audio
Deprecated
enca
Encrypted/Protected audio
Audio
ISO
encf
Encrypted/Protected font
Font
ISO
encm
Encrypted/Protected metadata
Metadata
ISO
encs
Encrypted Systems stream
(various)
ISO
enct
Encrypted Text
Text
ISO
encv
Encrypted/protected video
Video
ISO
evc1
Essential Video Coding
Video
NALu Video
evm1
Essential Video Coding slice base track
Video
NALu Video
evs1
Essential Video Coding slice component track without parameter sets
Video
NALu Video
evs2
Essential Video Coding slice component track that may contain parameter sets
Video
NALu Video
fdp$20
File delivery hints
Hint
ISO
FFV1
An open lossless intra-frame video codec
Video
FF Video Codec
fLaC
Free Lossless Audio Codec (FLAC)
Audio
FLAC
g719
ITU-T Recommendation G.719 (2008)
Audio
ITU G.719
0xA8
g726
ITU-T Recommendation G.726 (1990)
Audio
SDV
hev1
HEVC video with parameter sets in the Sample Entry or samples
Video
NALu Video
0x23
hev2
HEVC video with constrained extractors and/or aggregators and parameter sets in the Sample Entry or samples
Video
NALu Video
0x23
hev3
HEVC video with extractors and/or aggregators and parameter sets in the Sample Entry or samples
Video
NALu Video
0x23
hvc1
HEVC video with parameter sets only in the Sample Entry
Video
NALu Video
0x23
hvc2
HEVC video with constrained extractors and/or aggregators and parameter sets only in the Sample Entry
Video
NALu Video
0x23
hvc3
HEVC video with extractors and/or aggregators and parameter sets only in the Sample Entry
Video
NALu Video
0x23
hvt1
HEVC tile tracks
Video
NALu Video
hvt2
HEVC slice segment data track
Video
NALu Video
hvt3
HEVC Tile Track with Slice Segment Header Info
Video
NALu Video
icpv
Incomplete video
Video
ISO
invo
Initial viewing orientation
Metadata
OMAF
invp
Initial viewpoint
Metadata
OMAF
ixse
DVB Track Level Index Track
Metadata
DVB
j2ki
Sequence of JPEG 2000 Contiguous Codestream boxes as defined in Rec. ITU-T T.800 | ISO/IEC 15444-1
Video
J2KHEIF
jxsm
Video and image sequences coded to the JPEG-XS coding format
Video
JPXS
lhe1
Layered HEVC
Video
NALu Video
lht1
Layered HEVC tile tracks
Video
NALu Video
lhv1
Layered HEVC
Video
NALu Video
m2ts
MPEG-2 transport stream for DMB
Hint
DMB-MAF
m4ae
MPEG-4 Audio Enhancement
Audio
MP4v2
0x40, others
mebx
Timed metadata multiplex
Metadata
ISO
mett
Text timed metadata that is not XML
Metadata
ISO
metx
XML timed metadata
Metadata
ISO
mha1
MPEG-H Audio (single stream, unencapsulated)
Audio
MPEG-H
mha2
MPEG-H Audio (multi-stream, unencapsulated)
Audio
MPEG-H
mhm1
MPEG-H Audio (single stream, MHAS encapsulated)
Audio
MPEG-H
mhm2
MPEG-H Audio (multi-stream, MHAS encapsulated)
Audio
MPEG-H
mjp2
Motion JPEG 2000
Video
MJ2
mjpg
JPEG image sequences
Video
HEIF
mlix
DVB Movie level index track
Metadata
DVB
mlpa
MLP Audio
Audio
Dolby MLP
mp4a
MPEG-4 Audio
Audio
MP4v1
0x40, others
mp4s
MPEG-4 Systems
(various)
MP4v1
various
mp4v
MPEG-4 Visual
Video
MP4v1
0x20, others
mvc1
Multiview coding
Video
NALu Video
mvc2
Multiview coding
Video
NALu Video
mvc3
Multiview coding
Video
NALu Video
mvc4
Multiview coding
Video
NALu Video
mvd1
MVD stream
Video
NALu Video
mvd2
MVD stream
Video
NALu Video
mvd3
MVD stream
Video
NALu Video
mvd4
MVD stream
Video
NALu Video
ocpc
Object centre points correspondence between viewpoints
Metadata
OMAF
oksd
OMA Keys
Metadata
OMA DRM XBS
Opus
Opus audio coding
Audio
Opus
0xAD
pm2t
Protected MPEG-2 Transport
Hint
ISO
prtp
Protected RTP Reception
Hint
ISO
raw$20
Uncompressed audio
Audio
MJ2
rcvp
Recommended viewport without indicating a viewpoint
Metadata
OMAF
resv
Restricted Video
Video
NALu Video
rm2t
MPEG-2 Transport Reception
Hint
ISO
rrtp
RTP reception
Hint
ISO
rsrp
SRTP Reception
Hint
ISO
rtcp
RTCP reception hint track
Hint
ISO
rtmd
Real Time Metadata Sample Entry(XAVC Format)
Metadata
Sony
rtp$20
RTP Hints
Hint
ISO
n/a
rv60
RealVideo Codec 11
Video
RealHD
0xB0
rvp2
Recommended viewport concerning one or more indicated viewpoints
Metadata
OMAF
s263
ITU H.263 video (3GPP format)
Video
3GPP
samr
Narrowband AMR voice
Audio
3GPP
sawb
Wideband AMR voice
Audio
3GPP
sawp
Extended AMR-WB (AMR-WB+)
Audio
3GPP
sbtt
Text subtitles
Subtitles
ISO
sevc
EVRC Voice
Audio
3GPP2
0xA0
sevs
Enhanced Voice Services (EVS)
Audio
3GPP
sm2t
MPEG-2 Transport Server
Hint
ISO
sqcp
13K Voice
Audio
3GPP2
0xE1
srtp
SRTP Hints
Hint
ISO
n/a
ssmv
SMV Voice
Audio
3GPP2
0xA1
stcp
SRTCP reception hint track
Hint
ISO
STGS
Subtitle Sample Entry (HMMP)
Subtitle Graphics
Sony
stmd
Metadata for ERP (equirectangular projection) regions
Metadata
OMAF
stpp
Subtitles (Timed Text)
Subtitles
ISO
stxt
Simple timed text
Text
ISO
svc1
Scalable Video Coding
Video
NALu Video
svc2
Scalable Video Coding
Video
NALu Video
svcM
SVC metadata
Metadata
NALu Video
tc64
64 bit timecode samples
Timecode
Apple
tmcd
32 bit timecode samples
Timecode
Apple
ttsl
Sphere location for timed text
Metadata
OMAF
twos
Uncompressed 16-bit audio
Audio
MJ2
tx3g
Timed Text stream
Text
3GPP
ulaw
Samples have been compressed using uLaw 2:1.
Audio
QT
unid
Dynamic Range Control (DRC) data
Metadata
DRC
urim
Binary timed metadata identified by URI
Metadata
ISO
v3a1
V3C atlas track with atlas parameter sets only in sample entries
Volumetric visual media
V3C-SYS
v3ag
V3C atlas track with atlas parameter sets in sample entries or samples
Volumetric visual media
V3C-SYS
v3c1
V3C atlas track with a single atlas and atlas parameter sets only in sample entries
Volumetric visual media
V3C-SYS
v3cb
V3C atlas base track with common atlas data
Volumetric visual media
V3C-SYS
v3cg
V3C atlas track with a single atlas and atlas parameter sets in sample entries or samples
Volumetric visual media
V3C-SYS
v3e1
V3C bitstream track with atlas parameter sets only in sample entries
Volumetric visual media
V3C-SYS
v3eg
V3C bitstream track with atlas parameter sets in sample entries or samples
Volumetric visual media
V3C-SYS
v3t1
V3C atlas tile track with atlas tile data
Volumetric visual media
V3C-SYS
vc-1
SMPTE VC-1
Video
SMPTE
0xA3
vp08
VP8 video
Video
VPxx
vp09
VP9 video
Video
VPxx
0xB1
vrsp
Viewing space
Metadata
OMAF
vvcN
Versatile Video Coding with non-VCL (Video Coding Layer) NAL (Network Abstraction Layer) units only
Video
NALu Video
vvc1
Versatile Video Coding with parameter sets only in sample entries
Video
NALu Video
vvi1
Versatile Video Coding with parameter sets in sample entries or samples
Video
NALu Video
vvs1
Versatile Video Coding (VVC) subpicture track that does not contain a conforming VVC bitstream
Video
NALu Video
wvtt
WebVTT data
Text
ISO-Text
encu
Encrypted/protected subtitles
Subtitles
ISO
encp
Encrypted/protected haptics
Haptics
ISO
enc3
Encrypted/protected volumetric visual
Volumetric visual media
ISO
iamf
Immersive Audio Model and Formats - Encapsulated IA Sequence
Audio
AOM-IAMF
ipcm
Integer based PCM format for audio
Audio
ISO-UNCA
fpcm
Floating-point based PCM format for audio
Audio
ISO-UNCA
cndm
Dynamic Metadata Sample Entry(XF-AVC S/XF-HEVC S File Format)
Video
Canon

Metadata Item Type Codes Registered to ISO

code
description
specification
auvd
Auxiliary Video descriptor
ISO
av01
AVIF image item
AVIF
avc1
AVC image item
HEIF
Exif
EXIF item
HEIF
evc1
EVC image item
HEIF
grid
Image item grid derivation
HEIF
hvc1
HEVC image item
HEIF
hvt1
HEVC tile image item
HEIF
iden
Image item identity derivation
HEIF
iovl
Image item overlay derivation
HEIF
j2k1
Contiguous Codestream box as specified in Rec. ITU-T T.800 | ISO/IEC 15444-1
J2KHEIF
jpeg
JPEG image item
HEIF
jxs1
Images coded to the JPEG-XS coding format
JPXS
lhv1
Layered HEVC image item
HEIF
mint
Data integrity item
HEIF
mime
Item identified by a MIME type
ISO
mski
Mask item
HEIF
rgan
Region item
HEIF
vvc1
VVC image item
HEIF

Box types contained in specific Sample Entries

code
description
handler
specification
3sib
MVD Scalability Information SEI Message Box
Video
NALu Video
6vpC
Viewport Configuration
Volumetric visual media
V3C-SYS
a3dC
A3DConfigurationBox
Video
NALu Video
auxi
AuxiliaryTypeInfoBox
Video
HEIF
av1C
AOM Video Codec Configuration
Video
AV1-ISOBMFF
avcC
AVC Configuration
Video
NALu Video
btrt
Bit-rate information
General
ISO
cclv
Content colour volume
Video
ISO
ccst
Coding Constraints
Video
HEIF
chnl
Channel layout
Audio
ISO
clap
Clean aperture
Video
ISO
clli
Content Light Level
Video
ISO
colr
Color information (see note below)
Video
ISO
CoLL
Content Light Level Box
Video
VPxx
dac3
Decoder specific info for AC-3 audio
Audio
ETSI AC-3
dac4
Decoder specific info for AC-4 audio
Audio
ETSI AC-4
dec3
Decoder specific info for Enhanced AC-3 audio
Audio
ETSI AC-3
dfLa
Free Lossless Audio Codec (FLAC) specific data
Audio
FLAC
dhec
Default HEVC extractor constructor box
Video
NALu Video
dmix
Downmix instructions
Audio
ISO
dmlp
Decoder specific info for MLP audio
Audio
Dolby MLP
dvcC
Dolby Vision Configuration
Video
Dolby Vision
dvvC
Dolby Vision Extended Configuration
Video
Dolby Vision
dvwC
Dolby Vision Extended Configuration 2
Video
Dolby Vision
ecam
Extrinsic camera parameters
Video
NALu Video
esds
Elementary stream descriptor
General
MP4v2
evcC
EVC configuration
Video
NALu Video
evsC
Configuration for EVC slice component track
Video
NALu Video
fiel
Field Coding
Video
MJ2
hvcC
HEVC Configuration
Video
NALu Video
hvtC
HEVC Tile Configuration
Video
NALu Video
icam
Intrinsic camera parameters
Video
NALu Video
jpgC
JPEG Configuration
Image Item and Image sequences
HEIF
leqi
Loudness equalization instructions
Audio
DRC
lhvC
Layered HEVC Configuration
Video
NALu Video
m4ds
MPEG-4 descriptors
General
NALu Video
maeI
MPEG-H Audio scene information
Audio
MPEG-H
maeM
MPEG-H Audio multi-stream signalling
Audio
MPEG-H
mdcv
mastering display colour volume
Video
ISO
mhaC
MPEG-H Audio Decoder Configuration
Audio
MPEG-H
mhaD
MPEG-H Audio dynamic range control and loudness
Audio
MPEG-H
mhaP
MPEG-H Audio profile and level compatibility set
Audio
MPEG-H
mvcC
MVC configuration
Video
NALu Video
mvcP
MVC priority assignment
Video
NALu Video
mvdC
MVCDConfigurationBox
Video
NALu Video
pasp
Pixel aspect ratio
Video
ISO
pdc1
Parametric DRC coefficients
Audio
DRC
pdi1
Parametric DRC instructions
Audio
DRC
prmr
Production metadata reference box
Video
Youtube
qlif
Layer quality assignments
Video
NALu Video
scrb
Scramble scheme information
Video
ISO
seib
Scalability information
Video
NALu Video
SmDm
Mastering Display Metadata Box
Video
VPxx
srat
Sampling rate
Audio
ISO
svcC
SVC configuration
Video
NALu Video
svcP
SVC priority assignments
Video
NALu Video
svmC
SVC information configuration
Metadata
NALu Video
txtC
Text stream configuration
Text
ISO
udc1
Basic DRC coefficients
Audio
DRC
udc2
Unified DRC coefficients
Audio
DRC
udex
Unified DRC configuration extension
Audio
DRC
udi1
Basic DRC instructions
Audio
DRC
udi2
Unified DRC instructions
Audio
DRC
ueqc
Equalization coefficients
Audio
DRC
ueqi
Equalization instructions
Audio
DRC
uriI
URI Information
Metadata
ISO
v3cC
V3C Configuration
Volumetric visual media
V3C-SYS
v3tC
V3C Atlas Tile Configuration
Volumetric visual media
V3C-SYS
vexu
Video Extended Usage
Video
Apple
vpcC
VP9 Codec Configuration
Video
VPxx
vsib
View scalability information
Video
NALu Video
vttC
WebVTTConfigurationBox
Text
ISO-Text
vvnC
VVC Network Abstraction Layer unit configuration
Video
NALu Video
vvcC
VVC video configuration
Video
NALu Video
vwid
View identifier
Video
NALu Video
vlab
WebVTT Source Label
Text
ISO-Text
cuvv
HDR Vivid Configuration
Video
UWA
pcmC
Uncompressed audio PCM configuration
Audio
ISO-UNCA

See the color information in the color types table for the contents of the color information box.

Sample Entry Codes Registered for QuickTime

code
description
handler
specification
agsm
GSM
Audio
QT
alaw
a-Law
Audio
QT
ap4h
Apple ProRes 4444 is an extremely high-quality version of Apple ProRes for 4:4:4:4 image sources (including alpha channels)
Video
QT
ap4x
Apple ProRes 4444 XQ is the highest-quality version of Apple ProRes for 4:4:4:4 image sources (including alpha channels)
Video
QT
apch
Apple ProRes 422 HQ is a higher-data-rate version of Apple ProRes 422 that preserves visual quality at the same high level as Apple ProRes 4444 but for 4:2:2 image sources
Video
QT
apcn
Apple ProRes 422 is a high-quality compressed codec tailored for multistream and real-time editing performance
Video
QT
apco
Apple ProRes 422 Proxy is an even more highly compressed codec than Apple ProRes 422 LT
Video
QT
apcs
Apple ProRes 422 LT is a more highly compressed codec than Apple ProRes 422
Video
QT
aprh
Apple ProRes RAW HQ additional quality at a higher data rate
Video
QT
aprn
Apple ProRes RAW
Video
QT
c608
CEA 608 Captions
Closed Caption
QT
c708
CEA 708 Captions
Closed Caption
QT
CFHD
CineForm High-Definition (HD) wavelet codec
Video
CineForm
civd
Cinepak Video
Video
QT
drac
Dirac Video Coder
Video
Dirac
DV10
Digital Voodoo 10 bit Uncompressed 4:2:2 codec
Video
Digital Voodoo
dvh5
DVCPRO-HD 1080/50i
Video
QT
dvh6
DVCPRO-HD 1080/60i
Video
QT
dvhp
DVCPRO-HD 720/60p
Video
QT
dvi$20
DVI (as used in RTP, 4:1 compression)
Audio
QT
DVOO
Digital Voodoo 8 bit Uncompressed 4:2:2 codec
Video
Digital Voodoo
DVOR
Digital Voodoo intermediate raw
Video
Digital Voodoo
DVTV
Digital Voodoo intermediate 2vuy
Video
Digital Voodoo
DVVT
Digital Voodoo intermediate v210
Video
Digital Voodoo
fl32
32 bit float
Audio
QT
fl64
64 bit float
Audio
QT
flic
Autodesk FLIC animation format
Video
QT
gif$20
GIF image format
Video
QT
h261
ITU H.261 video
Video
QT
h263
ITU H.263 video (QuickTime format)
Video
QT
HD10
Digital Voodoo 10 bit Uncompressed 4:2:2 HD codec
Video
Digital Voodoo
ima4
IMA (International Multimedia Assocation, defunct, 4:1)
Audio
QT
in24
24 bit integer uncompressed
Audio
QT
in32
32 bit integer uncompressed
Audio
QT
jpeg
JPEG image format
Video
QT
lpcm
Uncompressed audio (various integer and float formats)
Audio
QT
M105
Internal format of video data supported by Matrox hardware; pixel organization is proprietary
Video
Matrox
mjpa
Motion-JPEG (format A)
Video
QT
mjpb
Motion-JPEG (format B)
Video
QT
Opus
Opus audio coding
Audio
Opus
png$20
W3C Portable Network Graphics (PNG)
Video
QT
PNTG
Apple MacPaint image format
Video
QT
Qclp
Qualcomm PureVoice
Audio
QT
QDM2
Qdesign music 2
Audio
QT
QDMC
Qdesign music 1
Audio
QT
rle$20
Apple animation codec
Video
QT
rpza
Apple simple video 'road pizza' compression
Video
QT
Shr0
Generic SheerVideo codec
Video
BitJazz
Shr1
SheerVideo RGB[A] 8b - at 8 bits/channel
Video
BitJazz
Shr2
SheerVideo Y'CbCr[A] 8bv 4:4:4[:4] - at 8 bits/channel, in ITU-R BT.601-4 video range
Video
BitJazz
Shr3
SheerVideo Y'CbCr 8bv 4:2:2 - 2:1 chroma subsampling, at 8 bits/channel, in ITU-R BT.601-4 video range
Video
BitJazz
Shr4
SheerVideo Y'CbCr 8bw 4:2:2 - 2:1 chroma subsampling, at 8 bits/channel, with full-range luma and wide-range two's-complement chroma
Video
BitJazz
SVQ1
Sorenson Video 1 video
Video
QT
SVQ3
Sorenson Video 3 video
Video
QT
tga$20
Truvision Targa video format
Video
QT
tiff
Tagged Image File Format (Adobe)
Video
QT
ulaw
Samples have been compressed using uLaw 2:1.
Audio
QT
vdva
DV audio (variable duration per video frame)
Audio
QT
WRLE
Windows BMP image format
Video
QT