- 精华
- 0
- 帖子
- 56
- 威望
- 0 点
- 积分
- 59 点
- 种子
- 0 点
- 注册时间
- 2007-1-13
- 最后登录
- 2020-1-5
|
发表于 2009-9-22 13:53 · 澳大利亚
|
显示全部楼层
Ok, 我们让数据说话，以下是正版blu-ray discs tech specification. 楼主，您的到版光盘如果能做到以下的标准的话，本人马上致以万二分的歉意，并收回之前说过的任何正版优于到版的言论，当然，也请提供Sony Certified Lab analysis report to verify your ground.
以下数据截取于Wikipedia.
Technical specifications
Type Physical size Single layer capacity Dual layer capacity
Standard disc 12 cm, single-sided 25 GB / 23866 MiB / 25025314816B 50 GB / 47732 MiB / 50050629632 B
Mini disc size 8 cm, single-sided 7.8 GB / 7430 MiB / 7791181824B 15.6 GB / 148605 MiB / 15582363648 B
High-definition video may be stored on Blu-ray ROM discs with up to 1920×1080 pixel resolution at up to 60 frames per second interlaced or 24 frames per second progressive.
Resolution Frame rate Aspect ratio Codec
1920×1080 59.94-i, 50-i 16:9
1920×1080 24-p, 23.976-p 16:9
1440×1080 59.94-i, 50-i 16:9 MPEG-4 AVC / SMPTE VC-1 only
1440×1080 24-p, 23.976-p 16:9 MPEG-4 AVC / SMPTE VC-1 only
1280×720 59.94-p, 50-p 16:9
1280×720 24-p, 23.976-p 16:9
720×480 59.94-i 4:3/16:9
720×576 50-i 4:3/16:9
Laser and optics
Blu-ray Disc uses a "blue" (technically violet) laser, operating at a wavelength of 405 nm, to read and write data. Conventional DVDs and CDs use red and near-infrared lasers, at 650 nm and 780 nm, respectively.
The blue-violet laser's shorter wavelength makes it possible to store more information on a 12 cm CD/DVD-size disc. The minimum "spot size" on which a laser can be focused is limited by diffraction, and depends on the wavelength of the light and the numerical aperture of the lens used to focus it. By decreasing the wavelength, increasing the numerical aperture from 0.60 to 0.85, and making the cover layer thinner to avoid unwanted optical effects, the laser beam can be focused to a smaller spot. This allows more information to be stored in the same area. For Blu-ray Disc, the spot size is 580 nm. In addition to the optical improvements, Blu-ray Discs feature improvements in data encoding that further increase the capacity. (See Compact Disc for information on optical discs' physical structure.)
Hard-coating technology
Since the Blu-ray Disc data layer is closer to the surface of the disc compared to the DVD standard, it was at first more vulnerable to scratches. The first discs were housed in cartridges for protection, resembling Professional Discs introduced by Sony in 2003.
Using a cartridge would increase price of already expensive media, so hard-coating of the pickup surface was chosen instead. TDK was the first company to develop a working scratch-protection coating for Blu-ray Discs. It was named Durabis. In addition, both Sony and Panasonic's replication methods include proprietary hard-coat technologies. Sony's rewritable media are spin-coated, using a scratch-resistant and antistatic coating. Verbatim's recordable and rewritable Blu-ray Discs use their own proprietary hard-coat technology, called ScratchGuard.
All Blu-Ray Disc media is required to use hard-coating. DVD media is not required to be scratch-resistant, but since development of the technology some companies like Verbatim implemented hard-coating for more expensive lineups of recordable DVDs.
Recording speed
Drive speed Data rate Write time for Blu-ray Disc (minutes)
Mbit/s MB/s Single-Layer Dual-Layer
1× 36 4.5 90 180
2× 72 9 45 90
4× 144 18 23 45
6× 216 27 15 30
8× 288 36 12 23
12×* 432 54 8 15
* Theoretical
Software standards
Codecs
The BD-ROM specification mandates certain codec compatibilities for both hardware decoders (players) and movie software (content). For video, all players are required to support MPEG-2 Part 2, H.264/MPEG-4 AVC, and SMPTE VC-1. MPEG-2 is the codec used on regular DVDs, which allows backwards compatibility. MPEG-4 AVC was developed by MPEG and VCEG. VC-1 is a codec that was mainly developed by Microsoft. BD-ROM titles with video must store video using one of the three mandatory codecs; multiple codecs on a single title are allowed.
The choice of codecs affects the producer's licensing/royalty costs as well as the title's maximum run time, due to differences in compression efficiency. Discs encoded in MPEG-2 video typically limit content producers to around two hours of high-definition content on a single-layer (25 GB) BD-ROM. The more-advanced video codecs (VC-1 and MPEG-4 AVC) typically achieve a video run time twice that of MPEG-2, with comparable quality.
MPEG-2 was used by many studios (including Paramount Pictures, which initially used the VC-1 codec for HD DVD releases) for the first series of Blu-ray discs, which were launched throughout 2006. Modern releases are now often encoded in either MPEG-4 AVC or VC-1, allowing film studios to place all content on one disc, reducing costs and improving ease of use. Using these codecs also frees a lot of space for storage of bonus content in HD (1080i/p), as opposed to the SD (480i/p) typically used for most titles. Some studios, such as Warner Bros., have released bonus content on discs encoded in a different codec than the main feature title. For example, the Blu-ray Disc release of Superman Returns uses VC-1 for the feature film and MPEG-2 for bonus content. Today, Warner and other studios typically provide bonus content in the video codec that matches the feature.
For audio, BD-ROM players are required to support Dolby Digital, DTS, and linear PCM. Players may optionally support Dolby Digital Plus and DTS-HD High Resolution Audio as well as lossless formats Dolby TrueHD and DTS-HD Master Audio. BD-ROM titles must use one of the mandatory schemes for the primary soundtrack. A secondary audiotrack, if present, may use any of the mandatory or optional codecs.
For users recording digital television programming, the recordable Blu-ray Disc standard's initial data rate of 36 Mbit/s is more than adequate to record high-definition broadcasts from any source (IPTV, cable/satellite, or terrestrial). BD Video movies have a maximum data transfer rate of 54 Mbit/s, a maximum AV bitrate of 48 Mbit/s (for both audio and video data), and a maximum video bitrate of 40 Mbit/s. This compares to HD DVD movies, which have a maximum data transfer rate of 36 Mbit/s, a maximum AV bitrate of 30.24 Mbit/s, and a maximum video bitrate of 29.4 Mbit/s.
Audio, video and other streams are multiplexed and stored on Blu-ray Video discs in a container format based on the MPEG-2 Transport stream. It is also known as BDAV MPEG-2 transport stream and can use filename extension .m2ts. Blu-ray Disc Video titles authored with menu support are in the BDMV (Blu-ray Disc Movie) format and contain audio, video, and other streams in BDAV container. There is also the BDAV (Blu-ray Audio/Visual) disc format, the consumer oriented alternative to the BDMV discs made for movie releases. BDAV disc format is used on BD-RE and BD-R discs for audio/video recording. Blu-ray employs the MPEG-2 transport stream recording method. That enables transport streams of digital broadcasts to be recorded as they are without altering the format.[60] It also enables flexible editing of a digital broadcast that is recorded as is and where the data can be edited just by rewriting the playback stream. Although it is quite natural, a function for high-speed and easy-to use retrieval is built in. Blu-ray Disc Video use MPEG-2 transport streams, compared to DVD's program streams. This allows multiple video programs to be stored in the same file so they can be played back simultaneously (e.g. with "Picture in picture" effect).
Java software support
Main article: BD-J
At the 2005 JavaOne trade show, it was announced that Sun Microsystems' Java cross-platform software environment would be included in all Blu-ray Disc players as a mandatory part of the standard. Java is used to implement interactive menus on Blu-ray Discs, as opposed to the method used on DVD video discs. DVDs use pre-rendered MPEG segments and selectable subtitle pictures, which are considerably more primitive and rarely seamless. At the conference, Java creator James Gosling suggested that the inclusion of a Java Virtual Machine, as well as network connectivity in some BD devices, will allow updates to Blu-ray Discs via the Internet, adding content such as additional subtitle languages and promotional features not included on the disc at pressing time. This Java Version is called BD-J and is a subset of the Globally Executable MHP (GEM) standard; GEM is the worldwide version of the Multimedia Home Platform standard. Most Blu-ray Discs that have BD-J menus do not allow a Blu-ray Disc player to automatically resume a movie from the point at which it was stopped. |
|
楼主: 发泡海绵
川公网安备 51019002005286号
楼主
