Mixi, who challenged low -delay transmission, built infrastructure with the latest standard SMPTE 2110 for IP video transmission

Mixi "Tipstar" app screen

Live videos distributed by Tipstar will be sent to the data center from more than 43 bicycle racing and auto racing sites nationwide.It is processed and transmitted to the studio as a video material.In addition, the program will be delivered to users via the cloud.The key to this base network is the capacity that processes a large amount of racing images held simultaneously all over the country and low delay.Due to the characteristics of studios, home at home, or AI, editing is a particularly important requirement for ensuring real -time.It is important not only to deliver high -quality images stably, but also to reduce these requirements at low cost.This is the first time that Mixi has been working on video distribution services in earnest.According to the director of Junpei Yoshino of the Development Headquarters Infrastructure, it is a series of challenges."There was no know -how about video transmission technology. Creating the base infrastructure and the application creation was a pretty challenging initiative for Mixi."

Mr. Junpei Yoshino, Director of the Infrastructure Division of Mixi Development Headquarters

Figure 1 shows how the video data is transmitted on the service base of the Tipstar, which applies the familiar "software style" to the video.The race video, which is the material of the program, is transmitted by optical or LTE line from the bicycle race track to the data center.Expensive dedicated lines are not used, and costs are reduced by sending compressed data on the best effort line.Initially, the service was quickly launched using an LTE line, which does not require a line pull -in work, and gradually replaced it with an optical line.

Chart 1 Tipstar image of video transmission

The material video received at the data center is unmanned with a video processing server, transmitted to the studio and used for program shooting.The mechanism during this time is the most distinctive part, and the system has evolved even after the release of the service.I was particular about the software of video processing and editing, and non -compression / low -delay transmission by IP.Instead of using dedicated equipment for video editing or data transmission, a system is composed of general servers, network equipment and software.In the transmission standard, in the world of broadcasting and commercial video images, SDI (Serial Digital Interface), which transmits non -compressed digital video signals with coaxial cables, is the mainstream, but this has been abolished."I wanted to process everything with servers and network devices we were used to," says Yoshino:"I would like to try various things while editing video with software, but it is hard to do with a machine for video. Because the SDI cable is more difficult to check normal than IP, and it is replaced in the event of a problem.We cannot do it from remotely. We have something that is not in our habits, such as having to put expensive equipment to switch images. By applying the software industry style to images, we are.In addition to the video processing and efficiency you want to do, "removal SDI" also leads to simplification and low cost of the video transmission system.Mixi chose the IP transmission standard "SMPTE ST 2110" to achieve live video transmission by IP.