For the current young people, chasing, brushing video has become the main leisure way.
Video can demonstrate the content to be expressed in the most intuitive dynamic form, showing unique artistic views through the rendering of color and sound, so that the audience will be satisfied.
However, when you chase, everyone must have encountered video card to need buffering, especially in the most exciting, this uncomfortable feelings are not submerged.
In this case, everyone is generally thought is the problem of network speed. In fact, this is not the network speed problem, and the deeper cause may be related to video coding.
Want to watch videos, upgrade broadband is not the only way, upgrade a network speed requires more expenses, and the problem is not necessarily resolved.
The major video platforms will be smoothly played while maintaining the quality of the screen while maintaining a different coding in order to make the video smooth play.
At present, the video website is mainly based on the three codes of H.264, H.265 and AV1. So if you can understand the video coding adopted by the video platform, you can make a significant increase in the smoothness of video viewing.
Next, the author will introduce three codes of H.264, H.265 and AV1.
H.264 encoding: currently using the most wide video coding
H.264 Coding is currently mainstream video coding, currently main electronic devices support H.264 encoding, using scope of application scenarios, digital TV, security monitoring, video conferencing, and other application scenarios.
That is to say, the video of our online chart, the downloaded video, most of the genuine video encoding of H.264 is used.
One reason for H.264 is reused is a nice compression ratio, providing better image quality on the same bandwidth conditions.
H.264 is currently using the most wide video coding method, and the currently supported equipment is also the most.
Mainstream computer hardware, smartphone, HD set-top box, game host, online video website support H.264 decoding. All devices can be played without burden, so the current situation is still mainstream encoding in video.
H.265: Smaller, faster, clearer
Although the H.264 encoding is still mainstream, with the improvement of video quality, the problem has gradually appeared, H.264 is gradually improving on high-resolution video, especially in suppressing 4K ultra HD video. H.264 encoding tends to form a large-capacity file.
According to the calculation, a 4K ultra HD movie is made using H.264 encoding. Its capacity exceeds 10GB, so huge data is not conducive to the transmission of network online video, the current civil bandwidth speed, during playback, Attractive phenomenon of carton and buffering.
In order to transmit a higher quality video in a limited network bandwidth, it is necessary to have a higher compression efficiency. So in 2012, ITU announced H.265 encoding.
This package is technically improved on the basis of H.264, mainly increasing compression ratios, reducing real-time delay.
The most important upgrade of H.265 encoding is to increase the compression efficiency of video coding, and the H.264 encoding can compress the same picture quality video than half of the capacity.
For example, a 1080p resolution film generates a video capacity at H.264 encoding is 1GB, if compressed with H.265 encoding, the capacity only needs 500MB. Smaller capacity is naturally more convenient to transfer on the network.
And the H.265 standard has also added support for 4K or even 8K ultra HD video when developed. At present, it is H.265 encoding when this video website is playing 4K video.
At present, the H.265 encoding is supported by most video websites, and the mainstream video sites such as Youku, Potato, B stations support H.265 video uploads and play.
Since it is possible to reduce the delay, it is also popular in some live platforms, and the domestic tiger teeth, Bilibili starts support H.265 encoding in live streams.
However, the hardware support device is slightly less than H.264, and some smartphones, set-top boxes, smartphones, and smartphones, unable to perform hardware decoding of H.265.
However, the products sold in the past two years began to support H.265 hardware decoding, where the sale of PS5 has supported hardware decoding of H.265 encoded.
AV1: Free open source really fragrant H.265 times pressure
Although the H.265 encoding is gradually popular in the video industry, it is necessary to spend a lot of licensing costs every year using H.265 encoding. This is a unclear burden.
In such a context, the AV1 encoding is born, the encoding is dominated by Google, which features the same video resolution, frame rate, bit rate, in addition to high freighter, with H.265, in the case of H.265 The entire video capacity can also be compressed by 20%, which means that AV1 encoding can further reduce online video to bandwidth requirements.
According to the test report of Streaming Media EAST, AV1 is in the same picture quality in three coding compared with H.265, H.264, and VP9, and the code rate is the lowest.
What is the benefit of reducing the code rate? In the process of video production, shooting high-resolution materials can effectively improve the clarity of the picture, but in the process of video stream distribution, it is necessary to improve the code rate to maintain video. Quality, once it reduces the code rate picture, it will become blurred.
The advantage of AV1 coding is to maintain the clarity of the screen in the case of reducing the video code rate. For the video website, it is not necessary to choose between the entangled bandwidth and the image quality, which can bring higher quality video services to the audience. Iqiyi, which has been adopted by AV1, has increased by 5 times the coding speed of AV1.
Although we are currently 1080p, 4K is even higher than 10K online popularity, if you want to watch these video content in the future, then in addition to high-bandwidth network, high compression rate coding reduces video The core advantage of the amount of data is reflected.
In addition, in hardware support, it is currently in the leading position, smart phone, computer, and gaming machines, and current AV1 codes only IRIS XE core graphics cards in Intel Tiger Lake 11 Retriord, NVIDIA RTX 30 Series and UNAVATIN 1000 Series Support.
However, AV1 open source is free of charge, and is popular with many companies. Currently Google expresses the Android TV series products starting from March 31 this year to start supporting AV1 coding and applies to any Android 10 and Android 11 devices.
On the TV, Sony this year's new Bravia XR series TV will also support AV1 coding. I believe that there will be more and more hardware support in the future.
At present, online video at home and abroad is mainly 1080p. In the future, with the popularity efficiency of 4K ultra HD video, the H.265 and AV1 encoding of the transmission pressure is gradually favored. The online video website may be dominated by these two major codes.
Editor in charge: Psy, Read more
Our other product:
