Tags: ITU-T MPEG-4 H.264
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(i) The standards developed by ITU-T (International Telecommunication Union Standardization Sector) for video conferencing are:
1. H.320 Protocol (for group-based conferences on ISDN): Proposed and adopted in 1990, it is the first international standard protocol. H.320 was adopted, making it a widely accepted standard for ISDN conference television.
2. H.323 protocol (implemented in video conferencing over IP networks): H.323, proposed in March 1997, provides multimedia communication standards for existing packet network PBNs (such as IP networks), and is currently the most widely used protocol. .
Hardware-based video conferencing systems basically adopt this technical standard, which ensures that terminals and MCUs produced by all manufacturers can be interconnected. A considerable portion of the equipment of each manufacturer is compatible with two standards, while the latest equipment uses the H.323 standard.
(2) MPEG-4 standard:
MPEG is the English abbreviation of Moving Pictures Experts Group. This expert group was jointly established by ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) in 1988, and is dedicated to the standardization of moving images and their accompanying audio coding.
Compared with other standards, MPEG-4 has a higher compression ratio, saves storage space, and has better image quality. It is especially suitable for transmitting video under conditions of low bandwidth and maintaining image quality. Software-based video conferencing systems basically adopt this technical standard.
(3) H.264 standard:
It combines the H.263 protocol and the MPEG-4 protocol in the H.323 protocol, and solves the problem that the current software-based video conferencing MPEG-4 standard cannot be compatible with the H.323 protocol terminal, which makes it the best video at present. Compression protocol.
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