Shallow talk about system of true conference of high-definition clear video and

The standard of conference of high definition video

In high-definition encode / before decipher technology arises, video conference data is to be based on global trade pattern (CIF) has code. International Telecommunication Union - telegraphic standard ministry (ITU-T) established video standard, call H.261 and H.263. H.261 standard defined QCIF and CIF format only. Format of 1/4 CIF (QCIF) is used at lowermost data to lead only (1000 64 / second and lower) the conference, had used rarely at present. Since H.263 standard since releasing, more is used " complete resolution " (the definition is 16CIF) format (4CIF and 16CIF) be used stage by stage. Because use this kind of level when, the limitation of computation and broadband, the general resolution that is used at conference of completely dynamic video remains CIF to arrive 4CIF.

ITU-T adopted video to reduce new standard recently, this method reduced the size of whole video file, thereby the file is OK more economic ground passes the network with smaller size to join (lower data is led / broadband) undertake transmission. Now, ITU-T suggests conference of high definition video uses H.264 video level, this standard occupies transmission rate to provide high quality picture through comparing small number. Now, h.264 already became HD-DVD (high-definition DVD) and conference of broadcast, wired, video and the compulsive level that consume electronic product.

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