Currently, new TVs have basically been equipped with 4K resolution, and 4K resolution displays are also among the few. The popularity of 4K display devices is so fast, but did you really see 4K content through them? I think the answer given by most readers is negative. Before answering why, we must understand that what is 4K?
4K is actually a standard for video resolution. Usually, the screen resolution of TV broadcast reaches 40,962,160, which is 4096 effective pixels in the horizontal direction, and 2160 effective pixels in the vertical direction are even Ultra HD, which is 4K resolution. The resolution of Full HD 1080P video we often say is 19201080, which is only a quarter of the 4K ultra HD resolution. It can be seen that the 4K resolution can bring unprecedented visual impact, and the exquisiteness and clarity of the picture will far exceed that of Full HD.
Ultra HD
Then some readers may have questions, because in addition to 4096216 resolution, 38402160's 4K resolution may be our most common, is this false 4K? actually not. The former (40962160) resolution is mainly applied in the field of digital cinema, while the latter (38402160) resolution is mostly used on 4K TVs or 4K displays, that is, on consumer-grade products. TVs or monitors with 38402160 resolution are also called UHDTV standard products. , all belong to the category of 4K resolution.
4K movie theater
4K was first appeared in theaters. In order to make the picture more clear, a lot of content in the movie field has been photographed and played back with 4K technical standards for a long time. What really makes 4K a hot topic is the emergence of 4K TV technology. With the continuous advancement of TV manufacturing technology, TV screens are becoming larger, coupled with the continuous upgrading of display technology, Quantum dots, OLED and other materials have been put into the screen manufacturing, making the user's definition of the TV has become higher and higher. Claim.
People are currently talking about 4K and pursuing 4K, but we can see very little 4K content. Judging from the current development trend, it may take some time for 4K to fully popularize in China. What factors are limiting the popularity of 4K?
What exactly affects the development of 4K
Let’s talk about the live broadcast of 4K signals. The readers of the two days concerned about the Olympic news may have noticed that the 2016 Rio Olympic Games in Brazil achieved the first 8K live live broadcast in the world. Although the 4K ultra-high-definition live broadcasting plan was cancelled, it still will There are recordings and broadcasts, this year's French European Cup also has some 4K live broadcast signals. 8K Let's put aside for the time being, because this is even more distant from us. And when we buy a 4K TV, we can really only watch the Olympic Games once every four years. Once every four years, do we have a European Cup?
Rio Olympics Live 8K
The scarcity of 4K resources has become an indisputable fact. We must know that the completion of 4K live broadcasting or a complete 4K movie production requires that 4K standards be met in recording, acquisition, production, and transcoding equipment. With high-definition, the cost of 4K equipment is even higher. In fact, recording and acquisition are better said that now there is a whole set of equipment, and then the production and transcoding need to face four times the amount of information in Full HD, but also to carry out more accurate editing, rendering, color synthesis, lyrics, Transcoding and a series of operations, and to ensure that the content is output without delay. In addition, in the final transmission link, although there are currently solutions, the stability of technology and equipment is still not fully mature, and the cost is also huge.
4K live broadcast equipment
Let’s talk about watching 4K sources via the Internet. Users who use Internet TV may have noticed that many Internet TVs have launched 4K areas, including 4K film sources or movie trailers. Mixed with the pseudo-4K or 1080P movie feature, the number of 4K standards that can really meet is extremely rare. It can be said that the current 4K televisions can see most of the video content that is 1080P or lower in definition through the Internet.
4K required bandwidth
The scarcity of 4K sources in the real sense is only one aspect. The more important factor is the problem of network bandwidth. In general, watching 4K quality TV programs requires 6M/S traffic, that is, the transmission rate per second for bandwidth is 6M/S=6144kb/s. According to the 1M broadband transmission rate of 1Mb/s=10001000b/s=1000Kb/s=1000/8KB/s=125KB/s, the bandwidth of the 4K image quality should be at least 6144÷125≈50M, so the transmission of 1 channel 4K TV needs more than 50M of bandwidth. At the same time, this calculation is only a theoretical value, which may be higher in real environments. The proportion of the total number of broadband users above 20M in China is only 21.1%, so it may take some time to see the true 4K source through the Internet.
4K TV useless? This year may be a turning point
4K TV has been on the market for 4 years this year. There are more than 100 models of 4K ultra high-definition televisions on the market. However, it is very embarrassing that the 4K sources that the users can see so far are still rare and they have bought 4K TVs. But not seeing 4K content is a very sad thing, so that 4K ultra high definition television has its name. Currently, half of 2016 is over. One good news is that the dilemma of 4K is expected to improve in the second half of the year. The savior is Sony Pictures’ Blu-ray 4K film. Its listing means the arrival of the 4K era.
Sony Pictures
We all know that Blu-ray is Sony's leading high-definition standard. Sony, as the leader of the Blu-ray camp, relied on Sony Pictures and Sony PS3 game consoles to defeat the HD DVD camp and win the competition of the next-generation HD standards. In the era of 4K Blu-ray, Sony is naturally the most critical factor. Recently, Sony officially launched the first batch of 4K Blu-ray standard Blu-ray discs in Japan. However, if you want to play these 4K sources, you need to purchase the corresponding 4K Blu-ray disc players. Therefore, if you want to enter the 4K Ultra HD era in advance, you still need to pay a certain price. of.
Sony 4K Blu-ray Disc
At present, it is not confirmed how much the disc capacity of the disc, Blu-ray disc capacity has a variety of standards, 100GB, 200GB and higher capacity, in addition to the video resolution upgrade from 1080p to 4K, Dolby sound is also upgraded to panoramic sound With the track standard, the audiovisual experience has indeed improved dramatically.
Sony 4K Blu-ray Disc
Sony's first 4K ultra high definition Blu-ray discs have been officially launched on July 6th last month, and North American and European markets will be listed simultaneously. Interestingly, Japanese websites show that Sony 4K Blu-ray discs are not locked. This is a major breakthrough in the disc industry. Once the 4K Blu-ray discs begin to be on the market, it means that 4K resources can also be downloaded on the Internet, and the 4K era will kick off.
H.265 is an important factor in the popularization of 4K
We mentioned earlier that Sony Pictures’ Blu-ray 4K movie will officially kick off the 4K era. The 4K source will also become rich. However, to play these 4K sources, we need to purchase the corresponding 4K Blu-ray Disc player. The degree also increases the user's cost of use. If you want to watch 4K movies over the Internet, there is a key issue that needs to be addressed. That is, universal H.265 encoding technology.
High Efficiency Video Coding (High Efficiency Video Coding)
Although the H.265 coding technology has already appeared for the first time two years ago, it has not been widely applied to TV products and it has only gradually become popular this year. H.265 is a new video coding standard developed after the H.264 coding technology. H.265 uses advanced techniques to improve the relationship between code stream, coding quality, delay, and algorithm complexity. The optimized settings have been considerably improved compared to the previous H.264 standard. At present, China’s “Huawei†company has the most core patents and is the leader of the standard.
Need only normal bandwidth
And what does it have to do with watching 4K videos? The most important point is that H.265 coding technology is able to transmit higher quality network video under limited bandwidth. Only half of the original bandwidth is required to play the same quality video. This is the advantage of H.265 coding technology. We mentioned in the article that online viewing of 4K movies requires at least 50M of bandwidth. Once Internet video is encoded and compressed by H.265, the problem of poor viewing can be effectively mitigated.
The popularity of 4K is just around the corner
Fortunately, most of the current television products are able to support the decoding of H.265 video resources. Domestic Internet video companies have also begun to use H.265 encoding technology for video processing, in order to provide users with a smooth and high-quality video experience. . The popularity of 4K sources can be said to be inseparable from the support of HEVC (H.265) coding technology. In the long run, 8K is also the case. With the support of coding technology and 4K Blu-ray movies, the popularity of domestic 4K is just around the corner.
This article from the Tencent News client from the media does not represent Tencent News's views and positions.
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