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战斗力 鹅
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注册时间 2009-2-12
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本帖最后由 الطائر 于 2014-11-15 05:53 编辑
喷了,只是制造 VCD Player,居然就成了 VCD 的发明人?

In mid-1993, Philips and JVC agreed to the Video CD specifications as later defined in the 'White Book'. The current version of the Video CD standard is 2.0 and has been published not only by Philips & JVC, but also by Sony and Matsushita (with Technics, National, Pioneer, Panasonic and others).
Video CD is a Compact Disc format which can store video sequences and high quality stereo sound in up to 98 A/V tracks. An A/V track contains play items which can be video, audio, or (up to 2,000) still images with or without audio. You can read the whole specifications over here.
What is MPEG?
A Video CD is designed to store digital video sequences in the MPEG-1 format. MPEG stands for Motion Picture Expert Group, which has defined the current compression method for digital video. Due to the high compression of the video data, it is possible to record up to 70 minutes of full-screen video and high-quality audio on a CD.
The Moving Picture Experts Group (MPEG) is a working group of authorities that was formed by ISO and IEC to set standards for audio and video compression and transmission.[1] It was established in 1988 by the initiative of Hiroshi Yasuda (Nippon Telegraph and Telephone) and Leonardo Chiariglione,[2] group Chair since its inception. The first MPEG meeting was in May 1988 in Ottawa, Canada.[3][4][5] As of late 2005, MPEG has grown to include approximately 350 members per meeting from various industries, universities, and research institutions. MPEG's official designation is ISO/IEC JTC1/SC29 WG11 – Coding of moving pictures and audio (ISO/IEC Joint Technical Committee 1, Subcommittee 29, Working Group 11).[6][7][8][9]
Cooperation with other groups
Joint Video Team
Joint Video Team (JVT) is joint project between ITU-T SG16/Q.6 (Study Group 16 / Question 6) – VCEG (Video Coding Experts Group) and ISO/IEC JTC1/SC29/WG11 – MPEG for the development of new video coding recommendation and international standard.[6][10] It was formed in 2001 and its main result has been H.264/MPEG-4 AVC (MPEG-4 Part 10).[11]
Joint Collaborative Team on Video Coding
Joint Collaborative Team on Video Coding (JCT-VC) is a group of video coding experts from ITU-T Study Group 16 (VCEG) and ISO/IEC JTC 1/SC 29/WG 11 (MPEG). It was created in 2010 to develop High Efficiency Video Coding, a new generation video coding standard that further reduces (by 50%) the data rate required for high quality video coding, as compared to the current ITU-T H.264 / ISO/IEC 14496-10 standard.[12][13] JCT-VC is co-chaired by Jens-Rainer Ohm and Gary Sullivan.
Standards
The MPEG standards consist of different Parts. Each part covers a certain aspect of the whole specification.[14] The standards also specify Profiles and Levels. Profiles are intended to define a set of tools that are available, and Levels define the range of appropriate values for the properties associated with them.[15] Some of the approved MPEG standards were revised by later amendments and/or new editions. MPEG has standardized the following compression formats and ancillary standards:
MPEG-1 (1993): Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s (ISO/IEC 11172). The first MPEG compression standard for audio and video. It is commonly limited to about 1.5 Mbit/s although the specification is capable of much higher bit rates. It was basically designed to allow moving pictures and sound to be encoded into the bitrate of a Compact Disc. It is used on Video CD and can be used for low-quality video on DVD Video. It was used in digital satellite/cable TV services before MPEG-2 became widespread. To meet the low bit requirement, MPEG-1 downsamples the images, as well as uses picture rates of only 24–30 Hz, resulting in a moderate quality.[16] It includes the popular MPEG-1 Audio Layer III (MP3) audio compression format.
MPEG-2 (1995): Generic coding of moving pictures and associated audio information (ISO/IEC 13818). Transport, video and audio standards for broadcast-quality television. MPEG-2 standard was considerably broader in scope and of wider appeal – supporting interlacing and high definition. MPEG-2 is considered important because it has been chosen as the compression scheme for over-the-air digital television ATSC, DVB and ISDB, digital satellite TV services like Dish Network, digital cable television signals, SVCD and DVD Video.[16] It is also used on Blu-ray Discs, but these normally use MPEG-4 Part 10 or SMPTE VC-1 for high-definition content.
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