SMPTE 421M
E771972
SMPTE 421M is the formal SMPTE standard that defines the VC-1 video compression format used for high-definition video encoding and distribution.
All labels observed (2)
| Label | Occurrences |
|---|---|
| SMPTE 421M canonical | 3 |
| SMPTE 421M: VC-1 Compressed Video Bitstream Format and Decoding Process | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9002132 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: SMPTE 421M Context triple: [VC-1, fullName, SMPTE 421M]
-
A.
SMPTE ST 2022
SMPTE ST 2022 is a family of standards from the Society of Motion Picture and Television Engineers that defines the transport of professional audio, video, and ancillary data over IP networks, including methods for encapsulation, error correction, and redundancy.
-
B.
SMPTE ST 2067
SMPTE ST 2067, also known as the Interoperable Master Format (IMF), is a standardized framework for file-based digital cinema and television mastering that enables efficient versioning, distribution, and archiving of audiovisual content.
-
C.
SMPTE ST 12
SMPTE ST 12 is a widely used SMPTE standard that defines timecode formats for synchronizing audio, video, and other media in film and television production.
-
D.
SMPTE ST 2059
SMPTE ST 2059 is a professional media industry standard that defines how to use IEEE 1588 Precision Time Protocol to synchronize clocks and signals across IP-based audio, video, and broadcast systems.
-
E.
SMPTE ST 2110
SMPTE ST 2110 is a suite of standards that defines the transport of professional media (video, audio, and ancillary data) over IP networks in real-time production environments.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: SMPTE 421M Target entity description: SMPTE 421M is the formal SMPTE standard that defines the VC-1 video compression format used for high-definition video encoding and distribution.
-
A.
SMPTE ST 2022
SMPTE ST 2022 is a family of standards from the Society of Motion Picture and Television Engineers that defines the transport of professional audio, video, and ancillary data over IP networks, including methods for encapsulation, error correction, and redundancy.
-
B.
SMPTE ST 2067
SMPTE ST 2067, also known as the Interoperable Master Format (IMF), is a standardized framework for file-based digital cinema and television mastering that enables efficient versioning, distribution, and archiving of audiovisual content.
-
C.
SMPTE ST 12
SMPTE ST 12 is a widely used SMPTE standard that defines timecode formats for synchronizing audio, video, and other media in film and television production.
-
D.
SMPTE ST 2059
SMPTE ST 2059 is a professional media industry standard that defines how to use IEEE 1588 Precision Time Protocol to synchronize clocks and signals across IP-based audio, video, and broadcast systems.
-
E.
SMPTE ST 2110
SMPTE ST 2110 is a suite of standards that defines the transport of professional media (video, audio, and ancillary data) over IP networks in real-time production environments.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
SMPTE standard
ⓘ
VC-1 specification ⓘ video coding standard ⓘ |
| abbreviation | SMPTE 421M ⓘ |
| alsoKnownAs |
VC-1 standard
ⓘ
linked to:
VC-1 video codec
|
| appliesTo |
high-definition video
ⓘ
interlaced video ⓘ progressive video ⓘ standard-definition video ⓘ |
| category | moving picture coding ⓘ |
| compatibleWith |
Windows Media Video 9
ⓘ
linked to:
WMV
|
| compressionType | lossy compression ⓘ |
| defines |
VC-1
ⓘ
conformance requirements for VC-1 bitstreams ⓘ conformance requirements for VC-1 decoders ⓘ entropy coding methods for VC-1 ⓘ inter-frame prediction tools for VC-1 ⓘ intra-frame prediction tools for VC-1 ⓘ loop filtering tools for VC-1 ⓘ picture layer syntax for VC-1 ⓘ sequence layer syntax for VC-1 ⓘ transport-independent bitstream format ⓘ |
| field |
digital video
ⓘ
video compression ⓘ |
| focus | efficient compression of high-definition video ⓘ |
| fullName |
SMPTE 421M: VC-1 Compressed Video Bitstream Format and Decoding Process
ⓘ
linked to:
SMPTE 421M
|
| organization | SMPTE ⓘ |
| publisher | Society of Motion Picture and Television Engineers ⓘ |
| region | international ⓘ |
| relatedStandard |
H.264
ⓘ
MPEG-2 Part 2 ⓘ
linked to:
H.262
MPEG-4 AVC ⓘ
linked to:
H.264
|
| specifies |
compressed video bitstream syntax for VC-1
ⓘ
decoding process for VC-1 ⓘ |
| standardizes | VC-1 video compression format ⓘ |
| supports |
advanced profile of VC-1
ⓘ
main profile of VC-1 ⓘ simple profile of VC-1 ⓘ |
| usedFor |
video distribution
ⓘ
video encoding ⓘ |
| usedIn |
broadcast applications
ⓘ
high-definition optical disc formats ⓘ streaming media ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: SMPTE 421M Description of subject: SMPTE 421M is the formal SMPTE standard that defines the VC-1 video compression format used for high-definition video encoding and distribution.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: SMPTE 421M