1. Blu-ray and HD DVD
Blu-ray that we are familiar with "blue-ray" disc, referred to as BD. In fact, from a technical point of view, BD and HD DVD have a 405nm wavelength of blue laser to read and write, is not it should be called "blue-ray" mean? Oh, as to why one called HD DVD and anohter called Blu-ray, left to go to Google.
2. Approach: HD Remux, HDRe, HDRip (BD similar)
2.1 HD Remux, referred to as Remux, usually refers to BD or HD DVD discs in video and audio content to non-destructive way to extract and package to a specific format (usually TS) files inside the treatment. It has not been any way of re-encoding, video and audio about "authentic." However, the film will not have the original disk Remux playback menu and footage, but the film has a large capacity in the current network environment require a longer download time.
2.2 HDre to the capacity, to obtain a better picture and sound quality on balance, will be re-encoded HD video streaming approach. It does not re-encode the audio stream, so they can maintain a good quality performance. HDre processing of the film at least, above the level of resolution to 720p, and therefore belong to the ranks of high-definition video.
2.3 HDRip video and audio streams are carried out re-encoding, the volume further reduced, the performance of less quality in 720p, better than DVDRip, but the volume is also close to the latter. A complete HDRip movies generally take up 2GB to 4GB storage space, ease of communication between audio and video enthusiasts. Of course, the picture quality than 720p to almost, HDRip are often classified as "SD" in the ranks.
3. Common resolutions: 720p, 1080i, 1080p, a1080, a720, 816p
The first three are used to identify key indicators of high-definition video resolution. Among them, the figures follow the i and p are the Interlace scan (interlaced) and Progressive scan (progressive scan) of the abbreviation, and the figures reflect the high-definition video vertical resolution. Refers to as 720p 1280 * 720 progressive scan, 1080i is 1920 * 1080 interlaced scanning, which is a horizontal resolution of the signal source in accordance with conventional methods abbreviated naming convention. To more than 720p resolution, high-definition source barriers to entry, 720p standard also known as the HD standard, and 1080i/1080p known as Full HD (Full HD) standard.
Part of the film's resolution of a720 and a1080, is the use of morphing technology to achieve higher picture quality. a1080 generally include 1080 and 1280 * 1440 * 1080 in two sizes, the vertical resolution of 1080p standards are met, the horizontal expansion through play, to achieve close to the clarity of Full HD. a720 generally use 960 * 720 size, but also lower to 852 * 720. The 816p resolution is not a standard, it is time to do re-encoding, in order to effectively use, reduced capacity, the use of AVS software will cut down the black side. 1920 * 1080 resolution, such as the ratio of 1.78:1, the film, the actual content was 2.35:1 wide screen, remove the black edges was in 1980 * 816. Deformation techniques can also be used to reduce the horizontal pixels to 1440, and finally became a 1440 * 816.
4. Video encoding: H.264, VC-1, MPEG-2, X264
Currently, the BD and HD DVD is widely used on high-definition video encoding formats are H.264, VC-1 and MPEG-2 three, from the compression ratio and performance requirements for the hardware to sort it, H.264> VC -1> MPEG-2, while the image quality is not absolute, in general, VC-1 is quite good. H.264 is the ITU-T (International Telecommunication Union) and ISO / IEC MPEG joint development, often referred to as AVC. Now there is a format called the X264 is actually a variant of H.264, which provides a free, open source encoder, common in HDre and HDRip format. Simply put, H.264 is a standard, and X264 is a specific implementation of this standard product. VC-1 is a dominated by Microsoft encoding format, the hardware performance on demand and video size to achieve a better balance, and MPEG-2 as a more mature technology base in the field of early high-definition wide range of applications.
5. Track format: DD5.1, DD Plus, Dolby TrueHD, DTS, DTS HD, LPCM
5.1 DD5.1: the traditional Dolby DIGItal 5.1 (Dolby Digital 5.1, AC-3), it can provide three-dimensional first-line entry-level multi-channel experience. DD5.1 ??is very high compression ratio, coding rate is low (only up to 640Kbps), in high-definition audio enthusiast applications inevitably stretched. Small footprint, ease of network transmission is the DD5.1 ??track two major advantages.
5.2 DTS: DTS is "Digital Theatre SySTem" abbreviation, are lossy compression techniques. Compared with DD5.1??, DTS encoding rate of 1.5Mbps or more, to achieve better audio playback.
5.3 DD Plus: Dolby Digital Plus, you can also write "DD +", which is common in high-definition audio technology applications, it has a 7.1 or above, the number of channels, a wider range of code rates up to 6Mbps. DD Plus can do both sound quality and volume, high-definition has been widely recognized by the industry for high-definition broadcast-level applications.
5.4 Dolby TrueHD: It uses a 100% lossless compression encoding, the encoding rate up to 18Mbps full-band and eight-channel 24bit/96kHz. As the coding rate is higher, Dolby TrueHD audio track storage space, bandwidth requirements for transmission is quite amazing, difficult to apply to broadcast systems are.
5.5 DTS-HD: DTS-HD 7.1-channel technology as a starting point, can support up to 32 channels of surround sound playback, the sampling rate from 8kHz to 192kHz, coding rate of up to 1.5Mbps. Dolby TrueHD DTS HD is the most powerful competitors in the HD video market has good prospects.
5.6 LPCM: LPCM is linear pulse code modulation (Linear Pulse Code ModulatiON) acronym, is a continuous linear sampling method to the analog signal into a digital signal of audio technology. LPCM audio without any compression, which ensure good sound quality, it also brings a large amount of data.
Package format: TS AVI MKV WMV
We usually more than four terms will be interpreted as high-definition video file extensions, but more precisely, this should be the four most common high-definition video package format. In theory, packaging formats and video coding formats and audio formats do not exist necessarily linked. Now, TS format has become the most widely used package online format, "Remux" new sources often see its shadow. Moreover, some of the more high-end audio technology, such as DTS-HD, TS format can only be packaged together. For AVI, is the most familiar form of a package, but are lagging behind the specifications, compatibility with the emerging video coding is poor. MKV and WMV source of the film is relatively abundant, but in general are not as good as TS format, and, PowerDVD does not support the MKV container format.
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