H.261
E695764
H.261 is an early international video compression standard developed by the ITU-T for real-time video conferencing over ISDN and similar networks.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
ITU-T Recommendation
ⓘ
video compression standard ⓘ |
| alsoKnownAs | Px64 ⓘ |
| approvedInYear | 1990 ⓘ |
| bitrateRange | 64 kbit/s to 2 Mbit/s multiples of 64 kbit/s ⓘ |
| category | lossy compression ⓘ |
| colorSpace | YCbCr ⓘ |
| compressionType | temporal and spatial redundancy reduction ⓘ |
| designedForNetwork | ISDN NERFINISHED ⓘ |
| developedBy |
CCITT
NERFINISHED
ⓘ
ITU-T NERFINISHED ⓘ |
| domain | digital video coding ⓘ |
| firstPublishedInYear | 1990 ⓘ |
| influenced |
H.263
NERFINISHED
ⓘ
H.264 NERFINISHED ⓘ MPEG-1 Video NERFINISHED ⓘ MPEG-2 Video NERFINISHED ⓘ |
| intendedUseCase | real-time interactive communication ⓘ |
| latencyCharacteristic | low-latency coding suitable for conversational services ⓘ |
| primaryUseEra | 1990s ⓘ |
| region | international standard ⓘ |
| replacedBy |
H.263
NERFINISHED
ⓘ
H.264 NERFINISHED ⓘ |
| scanFormat | interlaced video support via progressive source coding tools ⓘ |
| standardizedBy | ITU-T Study Group 15 NERFINISHED ⓘ |
| standardNumber | ITU-T Recommendation H.261 NERFINISHED ⓘ |
| status | largely obsolete ⓘ |
| supportsAudioAssociation | often used with ISDN audio codecs in conferencing systems ⓘ |
| supportsBitrateMultiple | p x 64 kbit/s ⓘ |
| supportsChromaFormat | 4:2:0 planar ⓘ |
| supportsColorSampling | 4:2:0 ⓘ |
| supportsErrorResilienceFeatures | limited compared to later standards ⓘ |
| supportsFrameRate | up to 30 frames per second ⓘ |
| supportsPictureFormat |
CIF 352x288
ⓘ
QCIF 176x144 ⓘ |
| supportsResolution |
CIF
NERFINISHED
ⓘ
QCIF ⓘ |
| targetApplication |
video conferencing
ⓘ
video telephony ⓘ |
| usesBlockSize | 8x8 DCT blocks ⓘ |
| usesCompressionType | block-based hybrid video coding ⓘ |
| usesEntropyCoding | variable-length coding ⓘ |
| usesGOPStructure | sequences of intra and inter pictures ⓘ |
| usesMacroblockStructure | 16x16 luma macroblocks ⓘ |
| usesMotionCompensation | inter-frame motion-compensated prediction ⓘ |
| usesPictureTypes |
inter-coded pictures
ⓘ
intra-coded pictures ⓘ |
| usesTransform | discrete cosine transform ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.