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wowza008 [2014/02/03 19:59] minetech |
wowza008 [2014/02/03 20:25] (현재) minetech |
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| + | MPEG-2 같은 계열은 | ||
| + | 원하는 용도별로 정의된 기능 집합을 **프로파일(Profile)**로 구분하여 정의하고 | ||
| + | Codec의 처리능력과 메모리 용량을 구분짓는 기준규격으로 **레벨(Level)**이 정의된다. | ||
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| + | 이들은 화면 해상도와 프레임 속도에 영향을 준다. | ||
| + | H.264을 준수하는 기기 또는 비트 스트림 자체는이 프로파일과 레벨에 따라 기기의 성능과 비트 스트림을 디코딩하는 데 필요한 성능을 표시하는 경우가 많다. | ||
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| == Profiles == | == Profiles == | ||
| - | The standard defines 21 sets of capabilities, which are referred to as ''profiles'', targeting specific classes of applications. | + | The standard defines 21 sets of capabilities, which are referred to as //profiles//, targeting specific classes of applications. |
| Profiles for non-scalable 2D video applications include the following: | Profiles for non-scalable 2D video applications include the following: | ||
| + | |||
| **Constrained Baseline Profile (CBP)** | **Constrained Baseline Profile (CBP)** | ||
| Primarily for low-cost applications, this profile is most typically used in videoconferencing and mobile applications. It corresponds to the subset of features that are in common between the Baseline, Main, and High Profiles. | Primarily for low-cost applications, this profile is most typically used in videoconferencing and mobile applications. It corresponds to the subset of features that are in common between the Baseline, Main, and High Profiles. | ||
| 줄 14: | 줄 22: | ||
| **Main Profile (MP)** | **Main Profile (MP)** | ||
| - | This profile is used for standard-definition digital TV broadcasts that use the MPEG-4 format as defined in the DVB standard.<ref>{{cite web|url=http**//www.etsi.org/deliver/etsi_ts/101100_101199/101154/01.09.01_60/ts_101154v010901p.pdf |title=TS 101 154 ? V1.9.1 ? Digital Video Broadcasting (DVB)** Specification for the use of Video and Audio Coding in Broadcasting Applications based on the MPEG-2 Transport Stream |format=PDF |date= |accessdate=2010-05-17}}</ref> It is not, however, used for high-definition television broadcasts, as the importance of this profile faded when the High Profile was developed in 2004 for that application. | + | This profile is used for standard-definition digital TV broadcasts that use the MPEG-4 format as defined in the DVB standard.[[http://www.etsi.org/deliver/etsi_ts/101100_101199/101154/01.09.01_60/ts_101154v010901p.pdf |Digital Video Broadcasting (DVB)]] It is not, however, used for high-definition television broadcasts, as the importance of this profile faded when the High Profile was developed in 2004 for that application. |
| **High Profile (HiP)** | **High Profile (HiP)** | ||
| 줄 35: | 줄 43: | ||
| For camcorders, editing, and professional applications, the standard contains four additional [[Intra-frame]]-only profiles, which are defined as simple subsets of other corresponding profiles. These are mostly for professional (e.g., camera and editing system) applications: | For camcorders, editing, and professional applications, the standard contains four additional [[Intra-frame]]-only profiles, which are defined as simple subsets of other corresponding profiles. These are mostly for professional (e.g., camera and editing system) applications: | ||
| - | **High 10 Intra Profile: The High 10 Profile constrained to all-Intra use. | ||
| - | **High 4{{!:}}2{{!:}}2 Intra Profile: The High 4:2:2 Profile constrained to all-Intra use. | ||
| - | **High 4{{!:}}4{{!:}}4 Intra Profile: The High 4:4:4 Profile constrained to all-Intra use. | ||
| - | **CAVLC 4{{!:}}4{{!:}}4 Intra Profile: The High 4:4:4 Profile constrained to all-Intra use and to CAVLC entropy coding (i.e., not supporting CABAC). | ||
| - | As a result of the [[Scalable Video Coding]] (SVC) extension, the standard contains five additional ''scalable profiles'', which are defined as a combination of a H.264/AVC profile for the base layer (identified by the second word in the scalable profile name) and tools that achieve the scalable extension: | + | **High 10 Intra Profile** |
| + | The High 10 Profile constrained to all-Intra use. | ||
| + | |||
| + | **High 4:2:2 Intra Profile** | ||
| + | The High 4:2:2 Profile constrained to all-Intra use. | ||
| + | |||
| + | **High 4:4:4 Intra Profile** | ||
| + | The High 4:4:4 Profile constrained to all-Intra use. | ||
| + | |||
| + | **CAVLC 4:4:4 Intra Profile** | ||
| + | The High 4:4:4 Profile constrained to all-Intra use and to CAVLC entropy coding (i.e., not supporting CABAC). | ||
| + | |||
| + | As a result of the [[Scalable Video Coding]] (SVC) extension, the standard contains five additional //scalable profiles//, which are defined as a combination of a H.264/AVC profile for the base layer (identified by the second word in the scalable profile name) and tools that achieve the scalable extension: | ||
| **Scalable Baseline Profile** | **Scalable Baseline Profile** | ||
| Primarily targeting video conferencing, mobile, and surveillance applications, this profile builds on top of the Constrained Baseline profile to which the base layer (a subset of the bitstream) must conform. For the scalability tools, a subset of the available tools is enabled. | Primarily targeting video conferencing, mobile, and surveillance applications, this profile builds on top of the Constrained Baseline profile to which the base layer (a subset of the bitstream) must conform. For the scalability tools, a subset of the available tools is enabled. | ||
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| Primarily targeting production applications, this profile is the Scalable High Profile constrained to all-Intra use. | Primarily targeting production applications, this profile is the Scalable High Profile constrained to all-Intra use. | ||
| - | As a result of the [[Multiview Video Coding]] (MVC) extension, the standard contains two ''multiview profiles'': | + | As a result of the [[Multiview Video Coding]] (MVC) extension, the standard contains two //multiview profiles//: |
| **Stereo High Profile** | **Stereo High Profile** | ||
| This profile targets two-view [[stereoscopic]] 3D video and combines the tools of the High profile with the inter-view prediction capabilities of the MVC extension. | This profile targets two-view [[stereoscopic]] 3D video and combines the tools of the High profile with the inter-view prediction capabilities of the MVC extension. | ||
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| |Separate color plane coding |No |No |No |No |No |No |No |No |Yes | |Separate color plane coding |No |No |No |No |No |No |No |No |Yes | ||
| |Predictive lossless coding |No |No |No |No |No |No |No |No |Yes | |Predictive lossless coding |No |No |No |No |No |No |No |No |Yes | ||
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wowza008.1391425176.txt.gz · 마지막으로 수정됨: 2014/02/03 19:59 저자 minetech
