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RDO can be metric-based, optimizing to score well on metrics like ",(0,o.kt)("a",{parentName:"p",href:"/docs/metrics/PSNR"},"PSNR")," or ",(0,o.kt)("a",{parentName:"p",href:"/docs/metrics/SSIM"},"SSIM"),"."),(0,o.kt)("h2",{id:"perceputal--psychovisual--psychoacoustic"},"Perceputal / Psychovisual / Psychoacoustic"),(0,o.kt)("p",null,'"Psychovisual quality" (for videos), "Psychoacoustic quality" (for audio), or "perceptual quality" is a term used to describe the perception of quality of a distorted video by the human visual system. The goal of any multimedia codec is to minimize data while maintaining perceived quality, and optimizing around human perception theoretically yields the best performance even within a limited set of coding techniques (like when using an older codec). Our model of human perception continues to evolve, and there is currently no such thing as a perfect model of the human visual system available. 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High energy compaction means the DCT is able to represent a signal with a small number of significant coefficients, in this case mainly in the lower frequencies."))}u.isMDXComponent=!0}}]); \ No newline at end of file diff --git a/assets/js/bc8b8418.e6c96851.js b/assets/js/bc8b8418.e6c96851.js deleted file mode 100644 index 19e195ca4..000000000 --- a/assets/js/bc8b8418.e6c96851.js +++ /dev/null @@ -1 +0,0 @@ -"use strict";(self.webpackChunkcodec_wiki=self.webpackChunkcodec_wiki||[]).push([[4704],{3905:(e,t,a)=>{a.d(t,{Zo:()=>d,kt:()=>h});var o=a(7294);function i(e,t,a){return t in e?Object.defineProperty(e,t,{value:a,enumerable:!0,configurable:!0,writable:!0}):e[t]=a,e}function r(e,t){var a=Object.keys(e);if(Object.getOwnPropertySymbols){var o=Object.getOwnPropertySymbols(e);t&&(o=o.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),a.push.apply(a,o)}return a}function n(e){for(var t=1;t=0||(i[a]=e[a]);return i}(e,t);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(e);for(o=0;o=0||Object.prototype.propertyIsEnumerable.call(e,a)&&(i[a]=e[a])}return i}var l=o.createContext({}),c=function(e){var t=o.useContext(l),a=t;return e&&(a="function"==typeof e?e(t):n(n({},t),e)),a},d=function(e){var t=c(e.components);return o.createElement(l.Provider,{value:t},e.children)},u="mdxType",m={inlineCode:"code",wrapper:function(e){var t=e.children;return o.createElement(o.Fragment,{},t)}},p=o.forwardRef((function(e,t){var a=e.components,i=e.mdxType,r=e.originalType,l=e.parentName,d=s(e,["components","mdxType","originalType","parentName"]),u=c(a),p=i,h=u["".concat(l,".").concat(p)]||u[p]||m[p]||r;return a?o.createElement(h,n(n({ref:t},d),{},{components:a})):o.createElement(h,n({ref:t},d))}));function h(e,t){var a=arguments,i=t&&t.mdxType;if("string"==typeof e||i){var r=a.length,n=new Array(r);n[0]=p;var s={};for(var l in t)hasOwnProperty.call(t,l)&&(s[l]=t[l]);s.originalType=e,s[u]="string"==typeof e?e:i,n[1]=s;for(var c=2;c{a.r(t),a.d(t,{assets:()=>l,contentTitle:()=>n,default:()=>m,frontMatter:()=>r,metadata:()=>s,toc:()=>c});var o=a(7462),i=(a(7294),a(3905));const r={title:"Terminology",sidebar_position:2},n="Terminology",s={unversionedId:"introduction/terminology",id:"introduction/terminology",title:"Terminology",description:"When learning about encoding technology, it is important to understand the vast terminology that is often used to describe concepts that are often not very complex to understand.",source:"@site/docs/introduction/terminology.md",sourceDirName:"introduction",slug:"/introduction/terminology",permalink:"/docs/introduction/terminology",draft:!1,editUrl:"https://github.com/av1-community-contributors/codec-wiki/tree/main/docs/introduction/terminology.md",tags:[],version:"current",sidebarPosition:2,frontMatter:{title:"Terminology",sidebar_position:2},sidebar:"tutorialSidebar",previous:{title:"Prologue",permalink:"/docs/introduction/prologue"},next:{title:"Spotting Video Artifacts",permalink:"/docs/introduction/video-artifacts"}},l={},c=[{value:"Bitstream",id:"bitstream",level:2},{value:"Elementary stream",id:"elementary-stream",level:2},{value:"Muxing",id:"muxing",level:2},{value:"Codec",id:"codec",level:2},{value:"Filter",id:"filter",level:2},{value:"Muxer/Demuxer",id:"muxerdemuxer",level:2},{value:"Bitstream filter",id:"bitstream-filter",level:2},{value:"Container",id:"container",level:2},{value:"MP4 / M4V",id:"mp4--m4v",level:4},{value:"MOV",id:"mov",level:4},{value:"MKV / MKA / MKS / MK3D",id:"mkv--mka--mks--mk3d",level:4},{value:"WebM",id:"webm",level:4},{value:"Transcoding",id:"transcoding",level:2},{value:"RDO",id:"rdo",level:2},{value:"Perceputal / Psychovisual / Psychoacoustic",id:"perceputal--psychovisual--psychoacoustic",level:2}],d={toc:c},u="wrapper";function m(e){let{components:t,...a}=e;return(0,i.kt)(u,(0,o.Z)({},d,a,{components:t,mdxType:"MDXLayout"}),(0,i.kt)("h1",{id:"terminology"},"Terminology"),(0,i.kt)("p",null,"When learning about encoding technology, it is important to understand the vast terminology that is often used to describe concepts that are often not very complex to understand."),(0,i.kt)("h2",{id:"bitstream"},"Bitstream"),(0,i.kt)("p",null,"A ",(0,i.kt)("em",{parentName:"p"},"bitstream")," or ",(0,i.kt)("em",{parentName:"p"},"bit stream")," is a media file, the kind that is played in a media player. It consists of a ",(0,i.kt)("a",{parentName:"p",href:"#container"},"container")," wrapping multiple ",(0,i.kt)("a",{parentName:"p",href:"#elementary-stream"},"elementary streams")),(0,i.kt)("h2",{id:"elementary-stream"},"Elementary stream"),(0,i.kt)("p",null,"An elementary stream is an audio, video, or subtitle track. Basically, it's the compressed data you want to ",(0,i.kt)("a",{parentName:"p",href:"#muxing"},"mux")," into the container."),(0,i.kt)("h2",{id:"muxing"},"Muxing"),(0,i.kt)("p",null,"Putting elementary streams into a container, which preserves them without making any changes to the data."),(0,i.kt)("h2",{id:"codec"},"Codec"),(0,i.kt)("p",null,"A codec (",(0,i.kt)("strong",{parentName:"p"},"co"),"der/",(0,i.kt)("strong",{parentName:"p"},"dec"),"oder) is the piece of code that actually encodes the data you put in. It takes as input and produces as output an elementary stream. More information is provided ",(0,i.kt)("a",{parentName:"p",href:"/docs/introduction/prologue/#what-is-a-codec"},"in the prologue"),"."),(0,i.kt)("h2",{id:"filter"},"Filter"),(0,i.kt)("p",null,"A filter is a piece of code you can apply to the data to make something about it different, for instance sharpening, removing artifacts, shakiness, denoising, scaling, overlay, etc."),(0,i.kt)("h2",{id:"muxerdemuxer"},"Muxer/Demuxer"),(0,i.kt)("p",null,"The pieces of code that ",(0,i.kt)("a",{parentName:"p",href:"#muxing"},"mux")," or do the reverse, getting elementary streams from the container."),(0,i.kt)("h2",{id:"bitstream-filter"},"Bitstream filter"),(0,i.kt)("p",null,"A bitstream filter is a filter that is directly applied to the ",(0,i.kt)("a",{parentName:"p",href:"#bitstream"},"bitstream")," in order to change something about the container, for instance, convert frame types, or corrupt some packets."),(0,i.kt)("h2",{id:"container"},"Container"),(0,i.kt)("p",null,"A container is a format for putting one or more elementary streams into one file, which is then called a ",(0,i.kt)("a",{parentName:"p",href:"#bitstream"},"bitstream"),"."),(0,i.kt)("p",null,'A video container is a digital file format that holds video and audio data, as well as additional information such as subtitles, metadata, and chapter markers. 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