Apple’s fall event showcased the iPhone’s largest display yet, with an ultra-retina display that was sharper and more spectacular than previous iphones. With the continuous development of video technology, a variety of information elements interact with us through a piece of screen, whether it is a mobile phone, a hand screen, a TV, a LIQUID crystal or an OLED, but there are always two core keywords “bigger and clearer”, video from 480P to 4K, and then to 8K, the definition is constantly upgraded. This is the basic human desire to see more of the real world from the screen.
8K is leading a new round of technological change. Following the completion of the world’s first 8K Internet live broadcast at the Shenzhen Cloud Conference, Ali Cloud completed the first APPLICATION demonstration of 5G+8K video technology in telemedicine at the 2018 Hangzhou Cloud Conference with the top technology ecology partners in the field of ultra HD video at home and abroad. Ali Cloud’s 8K ultra HD live broadcasting technology has also been transformed.
At the scene of the general assembly, the broadcast of the 8 k camera is responsible for the collection, after local real-time encoding, 5 g network will be subtle surface symptoms in patients with ocular hd video footage, uplink transmission to ali cloud Shanghai broadcast center for real-time processing, through the ultra low delay distribution of transmission, real-time decoding of live video through 8 k player rendering, In the end, it was presented clearly and delicately in front of the ophthalmologist of Run Run Shaw Hospital. Combined with the information exchange of the telemedicine platform, the remote consultation between experts and patients was completed.
This is the first time for Aliyun to display end-to-end 8K live broadcasting solution to the public in an all-round way, from the collection of 8K video to the terminal playback, combining with the return images of Run Run Shaw Hospital and the application scenario of remote consultation.
8K video resolution is as high as 7680×4320. Currently, IMAX screens in general cinemas in China are 4K, that is to say, 8K is four times that of IMAX. In order to match the changes brought by the resolution, the bit rate was set at 120M BPS and the frame rate was 60 FPS during this live broadcast, and HEVC coding was adopted to make the video source truly possess the characteristics of 8K.
In order to ensure the true 8K live broadcast, Ali Cloud has made a number of technical improvements and optimization in the live broadcast server:
Optimize the real-time transmission link of ultra-high bit rate: the bit rate of 8K original video is 4 times that of 4K. In order to ensure the real-time performance of 8K live broadcast, Ali Cloud extends its support for HEVC on RTMP, so that it can enjoy the high compression rate of HEVC and obtain the real-time performance of RTMP. Compressed live rate is as high as more than hundred megabits per second, with 5 g + ali cloud VPC high-speed channel uplink, CDN downward combination can ensure the stability of live streaming transmission, from the cloud meeting live center, live to Shanghai and then to run run shaw hospital, the data transmission distance for more than 400 km, turn the complicated network environment among them, checked by actual measured, The delay of 8K live broadcast has been comparable to that of ordinary Internet live broadcast, and the overall experience is very clear and smooth.
Extended real-time processing capability of 8K live streaming: Through the optimization of Alicloud live streaming service, the system supports real-time slicing and recording of 8K live streaming, supports HLS, HTTP+FLV, RTMP and other streaming media protocols, and also supports moving back to watch 8K live streaming.
Perfect live full link monitoring: through full link monitoring, the whole link topology of 8K can be seen in real time, and real-time audio and video frame rate and bit rate can be monitored for processing nodes and transmission links in the link, so that the running status of the whole 8K is clear at a glance. The real-time frame rate and bit rate data of audio and video were also displayed on the big screen. The data curve fluctuated gently and the live broadcast was very stable.
Self-developed live streaming player with high bit rate HEVC: With content collection and cloud processing, how to play the video with so much data per second in the terminal? There are dedicated devices for decoding HEVC hardware, but most only support local files and the cost is very high. Is it possible to make 8K video play smoothly on regular computers at a lower cost (a simple upgrade to an existing PC)?
To this end, Ali Cloud developed the 8K player. Through the ultimate exploration of hard decoding on Windows platform and precise control of playback choreography, it achieved 99% utilization rate of hard decoding GPU, made maximum use of hard decoding capability, and perfectly supported real-time broadcasting of 120M BPS and 60FPS RTMP live streams in the live broadcast of the conference. And through the conference site and intelligent media booth for a long time running, stable performance, and the existing 8K TV is fully compatible.
With years of technology precipitation and several major events, Ali Cloud video cloud has built a super-large scale media processing and distribution platform. At present, it has the capacity of 120T bandwidth storage, more than 1500 nodes, CDN covering 70 countries and many edge computing nodes. On this platform, hundreds of millions of minutes of media are processed for clients every day, connected to 1 billion devices, and 100 exabytes of information is distributed annually.
Ali Cloud has been laying out and actively exploring 8K ecology, promoting the formulation of 8K industrial chain standards, and accelerating the implementation of 8K video service application solutions. At the meeting, Ali Cloud jointly established the 8K industrial alliance with a number of enterprises including BOCOM, China Unicom, Panasonic, Soxi Technology, Advantech, Youku and Zhondiane.com, covering the whole link of content collection, content production, cloud computing processing, content distribution and so on, to promote the rapid and healthy development of 8K production.
It is reported that the 2020 Japan Olympic Games will use satellite transmission for 8K live, Ali cloud adopts a pure Internet way, which will lead the faster development of 8K industry and landing in more fields, making 8K can be faster, more convenient, lower cost access to thousands of households.
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