[Photo] Chengdu Sobey: high SD integrated solutions
Sobey integrated solutions high SD Chengdu Sobey Digital Technology Co., Ltd. Wong, greedy, deputy chief engineer
First, the Chinese began to HD Radio and Television Development
Present, the Chinese radio and television production industry has gradually editorial content development of the transition to high definition. Levels began to try to set up universal high-definition television program production systems, small-volume pre-and post-purchase HD equipment for high-definition broadcast material and program reserves. However, as the main broadcast is still SD, so television equipment procurement, the first thing to consider is how the existing SD-compatible materials and programs from the SD to HD to achieve a smooth transition. And each station has been built a small high-definition network, the lack of compatibility with existing SD system, systems solutions, often only a single network, eager and existing SD-compatible network and stand-alone. At the same time, with a large number of low-cost standard definition equipment (such as Sony's XDCAMHD) advent, HD technology threshold started to decrease and more and more popular, but also need well-integrated solutions.
Current TV stations in the procurement of high-definition equipment and characteristics of the factors considered are: reserve technology, programs and materials; try to inputs, to explore the development of lines; protection that is input, taking into account the existing network upgrade; for the definition of Taiwan make technical and operational reserve.
Existing HD application environments summarized in the following areas:
High-quality production: HD television and movies, all for the pure high-definition in the field;
high-end packaging, mainly produced in high-definition;
High-end quality production: TV program production, maximize the use of high-definition;
sports programs, if possible, the use of high-definition;
TV variety show, broadcast SD material, but as far as possible to consider retaining high-definition;
Mid-quality production: news feature shows, standard definition broadcast high-definition material, but also consider the reservation;
Low-cost production: social news programs, and SD broadcast but had begun to consider HDV;
Education, Standard Definition broadcast but have begun to use HDV.
Birth above the existing high-definition editing mode urgency of the needs, namely:
Users will try to acquire and to retain high-definition material;
XDCAMHD and HDV cameras offer a new low-cost high-definition source material;
Inevitably occur HD / HDV / SD mixed;
Broadcast in SD-based; hope to simultaneously produce HD programs, and preservation;
Maximize the use of low-cost HD programming and is compatible with SD; if the conditions are about to deploy to the desktop editing system.
Based on the above factors, Sobey company that: Integration of high SD would be the best development path. It must also have high SD on the carrying capacity; both a high and SD editing capabilities; the same time with high SD automatic conversion ability; the same time with high SD hybrid editing capabilities; both a high standard definition programming output capability; support SD / HD-compatible AVIT interface; achieve Mixed low-cost production of high SD; high SD of the best cost-effective mixed environments.
Second, Sobey high SD editing core technology integration
Sobey SD in the high editorial aspects of the integration of core technologies adequate reserves, specifically the following four key areas: format and bit rate, up and down converter, special effects and compositing, Text and others.
Formats and bit rate The following model describes the application of our existing areas of the corresponding practical video encoding format and bit rate of the test understanding of:
Format and bit rate model Based on the above analysis, we believe that non-code editing HD material will mainly use the following format and bit rate:
Uncompressed 4:4:4 / 4:2:2: suitable for high-end programming, such as high-definition movies, packaging, etc.
MPEG2IFrame4: 2:2:150 M? 200M, is characterized by high occupancy stream for high-end programming, including dramas, sports, etc.
MPEG2LongGOP4: 2:2:50 M moderate stream, but it needs LongGOP efficient editing support for mid-program production: TV drama, sports and news
MPEG2LongGOP4: 2:0 (1440X1080i): 18M, 25M, 35M low bit rate, need LongGOP efficient editing support for low-end programming: news, education, etc.
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