Layered coding: Difference between revisions
Layered Scalable Video Technology / Coding |
Adam7 algorithm, Bitrate peeling Hierarchical modulation JPEG 2000 AV1 § Scalable video coding |
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== See also == |
== See also == |
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* [[LCEVC|MPEG-5 Part 2 / Low Complexity Enhancement Video Coding / LC EVC]] - technique of similar approach |
* [[LCEVC|MPEG-5 Part 2 / Low Complexity Enhancement Video Coding / LC EVC]] - technique of similar approach |
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* [[Scalable Video Coding]] - technique of similar approach |
* [[Scalable Video Coding]] - [[H.264|MPEG-4]] specific technique of similar approach |
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* [[Scalability]] |
* [[Scalability]] |
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* [[Adam7 algorithm]], used in [[Portable Network Graphics#Interlacing|PNG interlacing]] |
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* [[Bitrate peeling]] |
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* [[AV1#Quality and efficiency|AV1]] codec with Scalable approach mode |
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* [[Hierarchical modulation]] |
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| ⚫ | * '''Scalable Video Technology''' umbrella of codecs, including: [[AV1#Software implementations|SVT-AV1]], [[VP9#Encoding|SVT-VP9]] and [[High Efficiency Video Coding#cite_ref-HEVCJuly2014R1008_160-0|SVT-HEVC]] encoders |
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* [[JPEG 2000]] |
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* [[AV1#Scalable video coding|AV1 § Scalable video coding]] codec with [[AV1#Quality and efficiency|Scalable]] approach mode |
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| ⚫ | |||
* Look up [[High Efficiency Video Coding#Concept|HEVC]] for '''[[High Efficiency Video Coding#Concept|Scalability Extensions]]''' ('''[[High Efficiency Video Coding#Standardization|SHVC]]''') |
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* [[Computer compatibility]] |
* [[Computer compatibility]] |
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Revision as of 18:46, 19 November 2021
Layered Coding is a type of data compression for digital video or digital audio where the result of compressing the source video data is not just one compressed data stream, as in other types of compression, but multiple streams, called layers, allowing decompression even if some layers are missing.
Overview
With layered coding, multiple data streams or layers are created when compressing the original video stream. This is in contrast to other types of compression, where the result is typically a single data stream.
During decompression, all layers can be combined to recreate the original video stream. Additionally, the stream can be decoded even if some layers are missing (though usually a layer hierarchy has to be respected, with a base layer that must available). If layers are missing, the resulting stream will have reduced visual quality, but will still be usable.[1]
Use cases
Layered coding is helpful when the same video stream needs to be available in different qualities, for example for adaptive bitrate streaming. Without layered coding, the source video stream must be encoded multiple times to obtain compressed streams with different qualities and bitrates. Layered coding allows only encoding a single time, because streams with different qualities can be obtained by discarding layers.
Related technologies
Layered coding is similar to multiple description coding in that both produce multiple compressed streams that can be combined.[2] However, with multiple description coding the different streams are independent of each other, so any subset can be decoded, providing additional flexibility.
Scalable Video Coding is a video compression standard that makes use of layered coding.
See also
- MPEG-5 Part 2 / Low Complexity Enhancement Video Coding / LC EVC - technique of similar approach
- Scalable Video Coding - MPEG-4 specific technique of similar approach
- Scalability
- Adam7 algorithm, used in PNG interlacing
- Bitrate peeling
- Hierarchical modulation
- JPEG 2000
- AV1 § Scalable video coding codec with Scalable approach mode
- Scalable Video Technology umbrella of codecs, including: SVT-AV1, SVT-VP9 and SVT-HEVC encoders
- Look up HEVC for Scalability Extensions (SHVC)
- Computer compatibility
References
- ^ "A Review of Multiple Description Coding Techniques for Error-Resilient Video Delivery" (PDF).
{{cite web}}: CS1 maint: url-status (link) - ^ Chakareski, J.; Han, S.; Girod, B. (2005-04-01). "Layered coding vs. multiple descriptions for video streaming over multiple paths". Multimedia Systems. 10 (4): 275–285. doi:10.1007/s00530-004-0162-3. ISSN 1432-1882. S2CID 165714.