Gurong Jiang: The current use IPTV Coding Standard Puzzles-IPTV, codec, AVS-HC network broadcasting

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On: Gu Rongjiang Present in the IPTV business, audio and video codec technology choices presents the three pillars of the state, that MPEG4ASP, H.264 and AVS. Three criteria for selection will be an important influence the formation of IPTV industry.

Â Tripod Present in the IPTV business, audio and video codec technology choices presents the three pillars of the state, that MPEG4ASP, H.264 and AVS. Including MPEG4 and H.264 are international standards related organizations, AVS is the national standard. IPTV industry chain as an important part of China Telecom and China Netcom, telecom operators such as audio and video codec technology for the development of similar ideas, are pushing H.264, AVS also shown for the wait and see attitude, saying that the future may IPTV equipment manufacturers will be asked to support AVS.

Compared to H.264 and AVS technical standards, MPEG4ASP streaming and IPTV applications in the market, the earliest start time, the highest level of industrialization, it was at this stage of the IPTV equipment provider of the most widely supported. In addition, the IPTV industry chain in China, another important aspect of Radio and Television Department (content operators) also tend to MPEG4. Among the three, AVS industrialization least, H.264 followed.

From a market point of view, MPEG2 product technology the most mature IPTV market in the most widely used abroad, also domestic digital broadcast television market acceptance and wide application. Microsoft's VC-1 or WM9 because foreign manufacturers are standard, regardless of industry or from the IPTV digital broadcast TV industry perspective, both national standardization organizations are not recognized, it will not get strong support from domestic operators .

Standards development First, we need to know about all the domestic IPTV industry standard meaning. IPTV industry standard now refers primarily to national standards, industry standards and enterprise standards. The national standard by the standardization of administrative departments (National Standardization Management Committee) formulated and promulgated, developing industry standards promulgated by the competent ministries, while the enterprise standard developed by the companies themselves. National standards, industry standards can be divided into mandatory standards and voluntary standards.

IPTV industry currently no national standards for IPTV. MII relevant departments IPTV industry standards are being developed, the standard IPTV in the future may become the national standard. AVS is recommended national standards for audio and video codec technology, the standard will be recommended in the IPTV industry standards and references. China Netcom and China Telecom's IPTV set standards for all companies belonging to IPTV standards. If the broadcasting sector should develop industry standards related to IPTV, then they will be on the IPTV standard audio and video codec technology options a significant impact.

Precisely, the current domestic IPTV industry in audio and video codec technology format war, mainly in IPTV standards to select which video codec technology issues, and for the choice of audio codec technology, the current industry not too much debate and careful consideration. In the IPTV system, video and audio codec technologies are relatively independent, such as: the current IPTV system equipment of different vendors to support MPEG1 LAYER 2 (MP2), MPEG1 LAYER3 (MP3), MPEG2 AAC, MPEG4AAC various audio codec technology one kind or several kinds of audio formats.

Foreign or local ? Audio and video encoding and decoding digital audio and video technique is the key technology is widely used, involves a digital TV, IPTV, mobile TV, VCD / DVD player, and other types of digital media devices and other industries. Based on simple economic reasons, to use foreign standards for audio and video codec technology will not only pay huge royalties, and standards as the most upstream industry chain directly affects the chip, software, front-end devices, storage, transmission, terminal equipment, the entire industry chain. As the AVS standard with independent intellectual property rights, not only to Chinese companies to avoid royalties distress, and charged with the protection and promotion of domestic digital audio and video related to the healthy development of the strategic role of industry. It is in this context, in February 2006 was officially promulgated AVS audio video coding standard for the country, and the part following the video, audio, mobile video systems, digital rights management component will have been completed and approved, published. Based on technical, economic, IPTV policy, industry protection and many other reasons, the domestic IPTV industry Alto choice of video codec technologies not only to the IPTV equipment providers, telecom operators, content providers, chip providers, operators with content , Ministry of Information Industry, China AVS standards organizations and other sectors closely related.

State Ministry of Information Industry as the IPTV industry standard-setter, its standard-setting work to protect the health of the domestic development of the whole industry chain and promote the best social benefits for the purpose, and the AVS Working Group itself received a Ministry of Information Industry The focus of support, it can be expected as the IPTV industry standard pronunciation AVS video codec technology, the basic choice. AVS is currently in from standardization to the process of industrialization, based on AVS codec chip encoder, set-top boxes, etc. are not product oriented.

AVS standard just as the promulgation of a large-scale product of yet, we have easy to understand why MPEG4 more at this stage has been broadcasting sector and the support of IPTV equipment providers. And AVS, H.264 comparison, MPEG4 coding and decoding devices and streaming media server applications become more mature and wide to MPEG4 format to store the content more widely. However, MPEG4 despite an early start, but the vigorous development of MPEG4, or Relying largely on the domestic IPTV market launch.

As for H.264, in addition to its technical nature, pushing the domestic telecom operators H.264 Another important reason is that evaded the MPEG4 H.264 patent fees to the operators, but also That is way H.264 patent fees charged to disperse the original enveloped in one fell swoop in the domestic telecom operators charge MPEG4 head shadow. So even in H.264 MPEG4 more expensive than the cost of the case, H.264 to domestic telecom operators are still exhilarated by a field day.

2002 , MPEG-LA announced the MPEG4 patent costs, in addition to the fixed costs of codecs, but also according to playing time content owners and content providers to charge the appropriate fees. For the domestic IPTV industry, in addition to content operators, IPTV operators are also required to pay fees related to patents.

This has created a stir in the industry, and directly into the promotion of H.26

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