MPEG founders had originally intended to develop the four versions: MPEG1-MPEG4, so as to apply to different bandwidth and quality requirements of digital imaging. Abandoned as a result of MPEG3 after, so there are only three versions of the existing MPEG: MPEG-1, MPEG-2, MPEG-4. Generally speaking, MPEG in three better than the other compression / decompression program. First of all, it is at the beginning as an international standard to study the development, so, MPEG has good compatibility. Secondly, MPEG algorithm can provide better than any other of the compression ratio up to 200:1. More importantly, MPEG in the provision of high compression ratio at the same time, a small loss of data.
MPEG-1
MPEG-1 was enacted in 1992, standards for industrial design, applied to different bandwidth devices such as CD-ROM, Video-CD, CD-i. It can be the standard for SIF resolution (for NTSC system for 352X240; for PAL system for 352X288) for the image compression, transmission rate of 1.5Mbits/sec, second player 30 with CD (mean CD) sound quality, quality VHS-level and very basic. MPEG encoding rates up to 4-5Mbits / sec, but with the rate of improvement, the decoded image quality decreased.
MPEG-1 has also been used for digital telephone network video transmission, such as asymmetric digital subscriber line (ADSL), video-on-demand (VOD), and education networks. At the same time, MPEG-1 can also be used as recording media or in the transmission of audio INTERNET.
MPEG-2
MPEG-2 was enacted in 1994, the design goal is high-level industry-standard image quality and higher transmission rates. MPEG-2 can provide transmission rates in the inter-3-10Mbits/sec, its under the NTSC standard resolution up to 720X486, MPEG-2 is also available and can provide broadcast quality video and CD quality-class. MPEG-2 audio coding can be provided in and around the two surround channels, as well as a heavier bass channel, and up to seven-channel sound (DVD can be 8 kinds of language voice of reason). MPEG-2 as a result of the design of ingenious in dealing with, making the majority of MPEG-2 decoder can also play MPEG-1 format data, such as VCD.
At the same time, MPEG-2 as a result of excellent performance, has been able to apply to HDTV, make the original intention for HDTV design MPEG-3, have not been abandoned born. (MPEG-3 requirements of transmission rate in the inter-20Mbits/sev-40Mbits/sec, but this will have a slight distortion of the screen). In addition to the designation as the DVD standard, MPEG-2 can also be used for broadcasting, cable television networks, cable networks and direct broadcast satellite (DirectBroadcastSatellite) to provide broadcast quality digital video.
MPEG-2, another feature is that it could provide a broader scope of changes in compression ratio in order to adapt to different screen quality, storage capacity, and bandwidth requirements.
For end-users, because the resolution of the existing restrictions on TV, MPEG-2 brought about by the high-definition picture quality (such as the DVD screen) on television effects are not obvious to their audio characteristics (such as the heavier bass, multi - channel sound, etc.) more eye-catching.
MPEG-4
MPEG Group of Experts on the experts is the development of MPEG-4 work. MPEG-4 standard is mainly used in video-telephone (videophone), video e-mail (VideoEmail) and e-news (Electronicnews) and so on, requiring a lower level of its transmission rate, in between 4800-64000bits/sec resolution 176X144.
MPEG-4 using a very narrow bandwidth, the frame-reconstruction techniques, compression and transmission of data, the data in order to at least get the best image quality.
And MPEG-1 and MPEG-2 compared to, MPEG-4 is characterized by its more suitable for interactive AV services, and remote monitoring. MPEG-4 is the first so that you become active from a passive (no longer just a watch that allows you to join them, that is interactive) dynamic image standards. Another feature is its integrated; source said MPEG-4 attempts to man-made objects and natural objects of integration (within the meaning of visual effects). MPEG-4 is designed to have wider adaptability and scalability.
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MPEG-1
MPEG-1 was enacted in 1992, standards for industrial design, applied to different bandwidth devices such as CD-ROM, Video-CD, CD-i. It can be the standard for SIF resolution (for NTSC system for 352X240; for PAL system for 352X288) for the image compression, transmission rate of 1.5Mbits/sec, second player 30 with CD (mean CD) sound quality, quality VHS-level and very basic. MPEG encoding rates up to 4-5Mbits / sec, but with the rate of improvement, the decoded image quality decreased.
MPEG-1 has also been used for digital telephone network video transmission, such as asymmetric digital subscriber line (ADSL), video-on-demand (VOD), and education networks. At the same time, MPEG-1 can also be used as recording media or in the transmission of audio INTERNET.
MPEG-2
MPEG-2 was enacted in 1994, the design goal is high-level industry-standard image quality and higher transmission rates. MPEG-2 can provide transmission rates in the inter-3-10Mbits/sec, its under the NTSC standard resolution up to 720X486, MPEG-2 is also available and can provide broadcast quality video and CD quality-class. MPEG-2 audio coding can be provided in and around the two surround channels, as well as a heavier bass channel, and up to seven-channel sound (DVD can be 8 kinds of language voice of reason). MPEG-2 as a result of the design of ingenious in dealing with, making the majority of MPEG-2 decoder can also play MPEG-1 format data, such as VCD.
At the same time, MPEG-2 as a result of excellent performance, has been able to apply to HDTV, make the original intention for HDTV design MPEG-3, have not been abandoned born. (MPEG-3 requirements of transmission rate in the inter-20Mbits/sev-40Mbits/sec, but this will have a slight distortion of the screen). In addition to the designation as the DVD standard, MPEG-2 can also be used for broadcasting, cable television networks, cable networks and direct broadcast satellite (DirectBroadcastSatellite) to provide broadcast quality digital video.
MPEG-2, another feature is that it could provide a broader scope of changes in compression ratio in order to adapt to different screen quality, storage capacity, and bandwidth requirements.
For end-users, because the resolution of the existing restrictions on TV, MPEG-2 brought about by the high-definition picture quality (such as the DVD screen) on television effects are not obvious to their audio characteristics (such as the heavier bass, multi - channel sound, etc.) more eye-catching.
MPEG-4
MPEG Group of Experts on the experts is the development of MPEG-4 work. MPEG-4 standard is mainly used in video-telephone (videophone), video e-mail (VideoEmail) and e-news (Electronicnews) and so on, requiring a lower level of its transmission rate, in between 4800-64000bits/sec resolution 176X144.
MPEG-4 using a very narrow bandwidth, the frame-reconstruction techniques, compression and transmission of data, the data in order to at least get the best image quality.
And MPEG-1 and MPEG-2 compared to, MPEG-4 is characterized by its more suitable for interactive AV services, and remote monitoring. MPEG-4 is the first so that you become active from a passive (no longer just a watch that allows you to join them, that is interactive) dynamic image standards. Another feature is its integrated; source said MPEG-4 attempts to man-made objects and natural objects of integration (within the meaning of visual effects). MPEG-4 is designed to have wider adaptability and scalability.
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