51.44 million viewers in more than 200 countries and regions; Zhejiang SATELLITE TV, Dragon TV 55 cities total audience rating of 2.39, firmly ranked the first segment of the market; 63% of users watching the party in youku live broadcast room participated in the interaction; 6.82 billion views of main topics on Weibo; The 2019 Tmall Double 11 Carnival night (hereinafter referred to as “cat night”), once again created a miracle.
Ali Cloud video cloud has been escorting the cat night for 5 consecutive years. Every year, the cat night live will bring out the new technology. In 2019 cat Night, the first use of 4K HIGH-DEFINITION broadcast car signal transmission and Dolby panoramic sound, so that the audience in front of the screen to hear the voice, “than the audience is real”. At the same time, the user is engaged in shopping carnival, but also the double enjoyment of the audio-visual perception.
In order to better present the online live broadcast effect of ultra-high definition and Dolby panoramic sound, Ali Cloud video innovatively applies SRT technology to cat night broadcast. Through the dual-channel SRT back transmission technology, it ensures that the synchronization of the front and back pictures can be maintained after the switch to the standby channel if the main channel signal source is abnormal, so as to achieve a truly seamless switch. This ensures the high-quality transmission of important program sources in the complex network, and reduces the delay by 30% compared to the traditional RTMP transmission, so that the cat-night highlights can be delivered to the user screen at a lower cost, more stable, faster and more complete.
Secure Reliable Transport (SRT) is an open source network transmission technology that can transmit data streams in a complex network environment in real time and accurately. It uses UDP protocol at the Transport layer. With the powerful data recovery capability of SRT and the high speed and low cost of UDP, SRT has the advantages of high speed and low cost. Finally, the safe, stable and fast transmission effect of SRT is realized.
Compared to other video streaming formats such as RTMP, HLS, and DASH, SRT features simplified interoperability, handles long network delays, supports multiple stream types, supports multiple concurrent streams, enhanced firewall traversal, accurate signal timing, low cost, and extensive federation support.
In order to realize the compatibility between SRT and existing live broadcasting system, ali Cloud video cloud team has carried out a number of technical transformation and optimization in a short period of time: 1. A new UDP Socket file descriptor is used for each SRT connection to support program hot upgrade. 2. Implement the STREAM ID option during SRT connection to distinguish different video streams and support multiple SRT video streams without opening more UDP ports, ensuring system security. 3.SRT streams are directly connected to Aliyun Live CDN system for transcoding and distribution.
SRT can also be used to realize point-to-point one-way high quality and high security transmission and video interaction, point-to-multipoint transmission, and video streaming protocol conversion and distribution. SRT has been successfully applied to Alibaba Video Cloud, which is another powerful supplement after RTS, the ultra-low delay live streaming service of Ali Cloud.
In the field of live broadcasting, Aliyun video cloud has accumulated a number of trump cards, which can calmly cope with the demand for high-quality live broadcasting of different scenes such as large-scale events live broadcasting, e-commerce live broadcasting, large-scale events live broadcasting, games live broadcasting, education live broadcasting, enterprise live broadcasting, etc., and has the media processing and distribution capability of multiple large-scale live broadcasting simultaneously. On the day of the support for Maomin, the live broadcast of league of Legends S9 Global Finals, CBA professional League, Taobao Live and other major events also smoothly ran to aliyun video cloud platform.
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