H.264 encoding four image quality levels
D1 is a standard format for displaying a digital television system, is divided into the following five kinds of specifications:
D1: 480i format (525i): 720 × 480 (horizontal 480 lines, interlaced), and the same definition NTSC analog television line frequency of 15.25kHz, corresponding to what we call 4CIF (720 × 576)
D2: 480P format (525p): 720 × 480 (horizontal line 480, progressive scan), compared to clear many D1 interlaced and progressive-scan DVD specifications the same line frequency of 31.5kHz
D3: 1080i format (1125i): 1920 × 1080 (horizontal 1080 lines, interlaced scanning), the most employed a relaxing HD resolution, a resolution of 1920 × 1080i / 60Hz, line frequency of 33.75kHz
D4: 720p format (750p): 1280 × 720 (horizontal line 720, progressive scan), although the resolution is lower than the D3, but because of progressive scan, with respect to the market more people feel 1080I (actual successive line 540) visual effects more clearly. But personal feeling, in the case of a maximum resolution of 1920 × 1080, D3 D4 feel more than clear, especially on expressive writing, a resolution of 1280 × 720p / 60Hz, line frequency of 45kHz
D5: 1080p format (1125p): 1920 × 1080 (1080 horizontal lines, progressive scan), the highest standard household high-definition video, a resolution of 1920 × 1080P / 60Hz, line frequency 67.5KHZ.
Where D1 and D2 standard is the highest standard we generally analog TV, and can not be said of the high definition, 1080i standard D3 is the basic standard for high-definition television, it is compatible with 720p format, and D5 of 1080P only standard on the professional, not the civilian level, 60HZ given above field frequency only under ideal conditions, and its line frequency 67.5KHZ, there is no such Gaohang frequency of the advent of television, actually in the professional field of 1080P field frequency only 24HZ, 25HZ and 30HZ.
It should be noted that is, D terminal is a special interface unique to Japan, with almost no domestic television such an interface, most are component inputs, component inputs and supports up to D4, in theory, certainly not HDMI (pure digital signal, high support to 1080P) the highest resolution, but at 1920: 1080 the following resolution on TV, generally not very different.
H.264 There are four quality levels, namely BP, EP, MP, HP:
1, BP-Baseline Profile: basic quality. Support I / P frame, supports only non interlaced (Progressive) and CAVLC; 2, EP-Extended profile: Advanced quality. Support I / P / B / SP / SI-frame, supports only non-interlaced (Progressive) and CAVLC; 3, MP-Main profile: main picture quality. Providing I / P / B-frame, non interlaced support (Progressive) and interleaved (Interlaced), also supports CABAC and CAVLC is supported; 4, HP-High profile: High quality. On the basis of the main Profile adds 8x8 intra-prediction, custom quantization, lossless video coding and more YUV format;
H.264 HP wants to illustrate the difference with H.264 MP talked about the necessary technological development of the H.264. JVT completed in 2003 H.264 essential part of the standard-setting work, include Baseline profile, Extended profile and Main profile, include different coding tools. After they completed the JVT H.264 FRExt (ie: Fidelity Range Extensions) extensions (Amendment) development work, including High profile (HP), High 10 profile (Hi10P), High 4: 2: 2 profile (Hi422P), High 4: 4: 4 profile (Hi444P) 4 Ge profile.
H.264 Baseline profile, Extended profile Main profile and sample data are for 8, 4: 2: 0 format video sequence, extending it to FRExt 8 to 12 sample data, the video format is 4: 2: 0 , 4: 2: 2 and 4: 4: 4, set up a High profile (HP), High 10 profile (Hi10P), High 4: 2: 2 profile (Hi422P), High 4: 4: 4 profile (Hi444P) 4 a profile, this profile are four to Main profile basis.
In the same configuration, High profile (HP) savings ratio Main profile (MP) 10% of the code flow, than the MPEG-2 MP save 60% of the traffic code has better coding performance. According to different application areas, Baseline profile and more used in real-time communications, Main profile and more used in streaming media, High profile is more used in the field of broadcasting and storage
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