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.

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.

ISO Code Points (see below for QuickTime code points)

Code Abstract Type Defined in/by ObjectType
ac-3 AC-3 audio Audio ETSI 0xA5
alac Apple lossless audio codec Audio Apple
avc1 Advanced Video Coding Video AVC 0x20
avcp Advanced Video Coding Parameters Video AVC 0x20
drac Dirac Video Coder Video Dirac 0xA4
dra1 DRA Audio Audio DRA 0xA7
ec-3 Enhanced AC-3 audio Audio ETSI 0xA6
enca Encrypted/Protected audio Audio ISMAc, ISO
encs Encrypted Systems stream System ISO
enct Encrypted Text Text ISO
encv Encrypted/protected video Video ISMAc, ISO
g726 ITU-T Recommendation G.726 (1990) Audio SDV
mjp2 Motion JPEG 2000 Video MJ2
mp4a MPEG-4 Audio Audio MP4v1 0x40, others
mp4s MPEG-4 Systems (Var.) MP4V1 various
mp4v MPEG-4 Visual Video MP4V1 0x20, others
oksd OMA Keys Metadata OMA DRM XBS
raw$20 Uncompressed audio Audio MJ2
rtp$20 RTP Hints Hint ISO n/a
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
sevc EVRC Voice Audio 3GPP2 0xA0
sqcp 13K Voice Audio 3GPP2 0xE1
srtp SRTP Hints Hint ISO n/a
ssmv SMV Voice Audio 3GPP2 0xA1
text Textual meta-data with MIME type Metadata MPEG4
twos Uncompressed 16-bit audio Audio MJ2
tx3g Timed Text stream Text 3GPP
vc-1 SMPTE VC-1 Video SMPTE 0xA3
xml$20 XML-formatted meta-data Metadata MPEG4

QuickTime Code Points

Code Abstract Type Defined in/by
CFHD CineForm High-Definition (HD) wavelet codec Video CineForm
DV10 Digital Voodoo 10 bit Uncompressed 4:2:2 codec Video Digital Voodoo
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
HD10 Digital Voodoo 10 bit Uncompressed 4:2:2 HD codec Video Digital Voodoo
M105 Internal format of video data supported by Matrox hardware; pixel organization is proprietary Video Matrox
PNTG Apple MacPaint image format Video QT
QDM2 Qdesign music 2 Audio QT
QDMC Qdesign music 1 Audio QT
Qclp Qualcomm PureVoice Audio QT
SVQ1 Sorenson Video 1 video Video QT
SVQ3 Sorenson Video 3 video 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
WRLE Windows BMP image format Video QT
agsm GSM Audio QT
alaw a-Law Audio QT
civd Cinepak Video Video QT
drac Dirac Video Coder Video Dirac
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
fl32 32 bit float Audio QT
fl64 64 bit float Audio QT
flic Autodesk FLIC animation format Video QT
gif GIF image format Video QT
h261 ITU H.261 video Video QT
h263 ITU H.263 video (QuickTime format) Video QT
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
mjpa Motion-JPEG (format A) Video QT
mjpb Motion-JPEG (format B) Video QT
png W3C Portable Network Graphics (PNG) Video QT
rle$20 Apple animation codec Video QT
rpza Apple simple video 'road pizza' compression Video QT
tga 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