How to build a live broadcast platform

Friends who need to build a live video platform don’t come to see it, the freshly released source code for live video is here!
As we all know, to build a live broadcast platform, a complete set of live video source code is the key. Taking Cloud Leopard's live video source code as an example, the editor will introduce you to how to build a live broadcast platform.
The first step, PC end video and audio collection
Currently the hottest and most trafficked games are terminal games, such as League of Legends, Sword Spirit, World of Tanks, DOTA2, Kart, Dream Three Kingdoms, Monster Hunter, Perfect World, Cross Fire, World of Warcraft, Fantasy Westward Journey, Hearthstone, etc. For large-scale games, it is necessary to perfectly capture the game screen and audio on the PC side.
The mainstream image on the PC side is currently 1080P high-definition resolution, and it is mainly a motion picture. The amount of data is very large. How to collect these data efficiently and encode and compress in real time, and at the same time have higher compression efficiency to save the platform The cost of data bandwidth at the end is a problem that needs to be considered in detail.

The second step, mobile video and audio collection
In addition to the live broadcast of PC-side games, we also have to do mobile-side games and outdoor scenes. Therefore, it is imperative to develop mobile-side live broadcast tools.
The current two major mobile phone operating systems are Google’s Android and Apple’s ios. The development languages ​​and development frameworks of the two major operating systems are quite different. Android system uses Java language for application layer development, while Apple's iOS system uses Object-C language for development. The two platforms have their own different development interfaces and features, and the applications on the two platforms do not have any compatibility, so we must form two APP development teams to complete this matter.
The third step, content publishing and transcoding
After the front-end equipment collects and processes the live video and audio content, it first pushes it to the origin server of the platform. We deploy the origin server in the local operator's backbone node room in Beijing (close distance for easy maintenance). The source server adopts a multi-machine cluster hot backup mechanism to prevent a source site server from affecting the stable operation of the entire platform after it goes down.
The source site server is connected to a professional disk array storage device. When the source site server receives the data, it first copies N copies and forwards it to the N secondary CDN nodes below, and copies one copy to the transcoding server at the same time. The transcoding server performs real-time transcoding of each stream received, mainly converting the high-definition bit stream into a standard-definition bit stream to a small-screen mobile terminal. The mobile terminal receiving the small-definition small bit stream not only meets its own small-screen resolution requirements , At the same time, it can reduce the decoding capability requirements of the mobile terminal and effectively save bandwidth costs.
At the same time, the transcoding server saves the real-time live streaming recording to the disk array for later on-demand playback.
The fourth step, streaming media release
Streaming media release is also very important to the entire platform, because the final service for end users is the streaming media servers distributed throughout the network. The stability and performance of the streaming media servers determine the end user experience. And the operating cost of the platform. Based on the previous experience of IPTV, the technical route we chose in this project is still self-developed. Of course, it is based on the previous IPTV streaming server. The core technical points have the following improvements:
1. The streaming media server is still implemented in C language to ensure the highest operating efficiency;
2. Change the previous multi-process model to an asynchronous IO model to improve the concurrent processing performance of the server;
3. Added support for RTMP and HLS protocols on the protocol layer;
4. Introduce the distributed architecture of Hadoop to facilitate large-scale distributed deployment, scheduling and fault tolerance;
Through these improvements, the overall performance of the streaming media server will have another qualitative leap.
The fifth step, CDN content distribution
CDN is a lot of content, but there are also many CDN service providers on the market. It shouldn’t be difficult to find one that suits you. In terms of protocol selection, we support RTMP and HTTP protocols according to the characteristics of live and on-demand applications. , UDP protocol these three types.
Finally, there is the player side, PC, Android, and iOS. The development of the live video source code itself requires a lot of time, energy and cost. If you are not prepared, it is recommended not to make the live video source code by yourself. After all, the market is excellent. The live video source code is still very rich

 

 

 

How far(long) the transmitter cover? The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far. EXAMPLE 5W FM Transmitter use in the city and hometown: I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile). I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile). I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft). Below are the approximate range of different power FM Transmitters. 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About Us FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.   We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.   Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.   We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . 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