A total of 51.44 million people watched in more than 200 countries and regions; Zhejiang Satellite TV and Oriental Satellite TV 55 cities had a total rating of 2.39, ranking first in the market at the same time; 63% of users watching the party in the Youku live broadcast room participated in the interaction; Weibo 6.82 billion Main topic reading; 2019 Tmall Double 11 Carnival Night (hereinafter referred to as "Cat Night"), once again created a miracle.
Alibaba Cloud Video Cloud has been escorting Cat Night for 5 consecutive years. Every year, Cat Night live broadcast will be technologically updated. In the 2019 Cat Night, the 4K HD OB van was used for signal transmission and Dolby Atmos for the first time, so that the audience in front of the screen heard the sound, "more real than the audience on site". While users are engaged in shopping spree, they also gain a double enjoyment in audiovisual perception.
In order to better present the ultra-high-definition and Dolby Atmos online live broadcast effect, Alibaba Cloud Video Cloud innovatively applies SRT technology to Cat Evening live broadcast, and uses dual-channel SRT backhaul technology to ensure that if the main signal source is abnormal , After switching to the standby path, it can continue to maintain the synchronization of the front and back pictures, and truly achieve seamless switching, thereby ensuring the high-quality transmission of important program sources in a complex network, and reducing the delay by 30% compared to traditional RTMP transmission , thereby delaying cats The exciting content is delivered to the user's screen at a lower cost, more stable, faster and more completely.
SRT (Secure Reliable Transport) is an open source network transmission technology that can transmit data streams in real time and accurately in a complex network environment. It uses UDP protocol at the transport layer, with SRT's powerful data recovery capabilities, plus the UDP protocol itself The characteristics of fast speed and low overhead finally realize the safe, stable and fast transmission effect of SRT.
Compared with other video streaming formats (such as RTMP, HLS and DASH), SRT has more simplified interoperability, handles long network delays, supports multiple stream types, supports multiple concurrent streams, enhances firewall traversal, and signal time Features such as accuracy, low cost, and extensive alliance support.
In order to achieve the compatibility of SRT with the existing live broadcast system, the Alibaba Cloud video cloud team has carried out a number of technical transformations and optimizations in a short time:
- 1. For each SRT connection, a new UDP Socket file descriptor is used to support the hot upgrade function of the program.
- . The STREAM ID option when implementing SRT connection establishment to distinguish different video streams, support multiple SRT video stream access without opening UDP ports, and can ensure the security of the system.
- The SRT stream is directly connected to the Alibaba Cloud Live CDN system for transcoding and distribution.
Through the above optimization, SRT is quickly integrated into TENGINE / NGINX and live CDN system through AXP (Application Exchange Platform, Alibaba Cloud Video Cloud's high-performance multi-UDP protocol transmission platform), which is the first time in the industry that SRT is perfectly integrated in TENGINE / NGINX In the system, it finally provides a strong technical guarantee for the perfect presentation of Maowan.
Using SRT can also achieve point-to-point one-way high-quality high-security transmission and video interaction, point-to-multipoint transmission, video streaming protocol conversion and distribution. SRT has been successfully used in Maowan, following Alibaba Cloud video cloud ultra-low latency live broadcast service RTS After another powerful supplement.
In the field of live broadcasting, Alibaba Cloud Video Cloud has gathered many trump cards, and can easily meet the high-quality live broadcast needs of different scenes such as large-scale event live broadcast, e-commerce live broadcast, large-scale event live broadcast, game live broadcast, educational live broadcast, and corporate live broadcast. Media processing and distribution capabilities for large-scale live broadcasts held simultaneously. On the day of supporting Cat Evening, the live broadcast of several major events such as the League of Legends S9 Global Finals, CBA Professional League, Taobao Live Streaming also ran smoothly on the Alibaba Cloud Video Cloud platform.
