How to choose the "primary and secondary" of the protocol during the development of live broadcast

The streaming media transmission protocol is also one of the necessary "projects" in the live broadcast development process. The commonly used streaming media protocols in the live broadcast mainly include RTP, RTCP, RTSP, RTMP, and HLS. Each of these transmission protocols has its own advantages and disadvantages, and is suitable for different live broadcast environments and needs. The most commonly used streaming media transmission protocol for Cloud Leopard's live broadcast system is RTMP. Some customers have asked us why we don't use HLS as the commonly used streaming media transmission protocol, so today I will explain why we only use the HLS protocol as an auxiliary use.

<!--[if !supportLists]-->1. <!--[endif]-->The definition of two protocols

RTMP is the current industry standard protocol for encoder output. Basically all encoders (cameras and the like) support RTMP protocol.

HLS is a streaming media network transmission protocol based on HTTP proposed by Apple. It belongs to slice transmission and has a large delay.

2. Advantages of HLS

The HLS transmission protocol is mainly used in the ios system to provide audio and video live and on-demand solutions for ios devices. Of course, now HLS can also support the Android system. Since the data is transmitted through the HLS protocol, there is no need to consider the issue of the firewall, and the duration of the segmented file is very short, and the client can quickly select and switch the code rate to adapt to the playback under different bandwidth conditions. In fact, overall, the biggest advantage of HLS is that Apple only provides native support for HLS on its own IOS system, which means that HLS needs to be used when developing ios.

3. Disadvantages of HLS

The biggest disadvantage of the HLS transmission protocol is the high delay, generally around 10-15 seconds. For apps such as live streaming that require high real-time interactivity, if the HLS transmission protocol is used, it may bring a certain delay to the live broadcast, and the user will also have a poor live viewing experience when watching, so in development When broadcasting software, the transmission protocol with low latency is always selected.

<!--[if !supportLists]-->4. <!--[endif]--> Reasons for choosing RTMP as primary HLS as secondary

The RTMP protocol is currently the most widely used streaming media transmission protocol for live broadcasting platforms. Because of the low latency of the RTMP protocol (about 1-5 seconds), RTMP is more suitable for live broadcasting than the HLS protocol. In addition, the RTMP support is very complete, so that the flash can play RTMP streams continuously for a long time, and the stability is also guaranteed. The reason for using the HLS protocol as an auxiliary is that HLS is the most stable in the ios system. Although it can also be used in the Android system now, RTMP is relatively suitable for live broadcasting. Therefore, when developing a live broadcast system that requires high real-time and interactivity, the RTMP protocol is selected and the HLS protocol is used as an auxiliary protocol. At present, the HLS protocol is mainly used in mobile phone wap pages and WeChat watch pages.

From the above content, it is not difficult to see that in the process of live broadcast development, it is very important to choose a suitable transmission protocol. Due to the limitations of the HLS protocol and the shortcomings of high latency, we only use the HLS protocol as an auxiliary. Of course, if it is not very demanding on real-time and interactivity, such as on-demand, it is completely possible to use the HLS protocol. But for the current live broadcast market, RTMP is the most commonly used transmission protocol.

 

 

 

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. ( The range is diameter ) 0.1W ~ 5W FM Transmitter ：100M ~1KM 5W ~15W FM Ttransmitter : 1KM ~ 3KM 15W ~ 80W FM Transmitter : 3KM ~10KM 80W ~500W FM Transmitter : 10KM ~30KM 500W ~1000W FM Transmitter : 30KM ~ 50KM 1KW ~ 2KW FM Transmitter : 50KM ~100KM 2KW ~5KW FM Transmitter : 100KM ~150KM 5KW ~10KW FM Transmitter : 150KM ~200KM How to contact us for the transmitter? Call me +8618078869184 OR Email me [email protected] 1.How far you want to cover in diameter ? 2.How tall of you tower ? 3.Where are you from ? And we will give you more professional advice. 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 . At the same time we also have to make sure our products system with a very reasonable price.   We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .   FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected] Our Factory We have modernization of the factory . You are welcome to visit our factory when you come to China. At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us . 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