The difference and scope of application of rtmp and rtsp

1. Video transmission
When receiving video from the network, the protocol (RTSP/RTMP/HTTP) must be resolved first, then the format (MKV, RMVB), and then the video (H264) and audio (AAC) format data must be decoded into images (RGB/ YUV) and sound (PCM), and then play synchronously according to the timestamp.

　　RTSP+RTP is mainly used for IPTV, the reason is that UDP is used to transmit data, and the transmission efficiency is relatively high when the network environment is relatively stable;

　　RTMP is mainly used for Internet audio and video transmission. It uses TCP transmission. Because the Internet environment is relatively poor, the use of RTMP ensures the quality of video transmission, but its transmission delay is relatively high and the transmission efficiency is relatively low.

The streaming media system using RTMP technology has a very obvious feature: it uses Flash Player as the player client, and Flash Player is now installed on nearly 99% of PCs in the world, so in general, watch the RTMP streaming system Video and audio do not need to install plug-ins. Users only need to open the webpage to watch streaming media directly, which is very convenient. Live broadcast services generally use RTMP as the streaming media protocol, FLV as the encapsulation format, H.264 as the video encoding format, and AAC as the audio encoding format. FLV is the packaging format used by RTMP, H.264 is the video coding standard with the highest coding efficiency in practical applications today, and AAC is the audio coding standard with the highest coding efficiency in practical applications today.

　　 librtmp is the realization of RTMP protocol, you can use librtmp to realize protocol analysis and data sending and receiving. The live broadcast server can be implemented based on nginx+rtmp; the live broadcast client uses librtmp to push the stream, and FFmpeg is responsible for encoding; the watching client uses VLC, because VLC itself can parse both the RTMP stream and the encoded video data.

Video compression is divided into lossy compression and lossless compression.
　　 Lossless compression is to use some compression algorithms to compress the video, but after the compression is completed, the original data can be restored truly;

　　 Lossy compression is the use of some characteristics of the human eye, discarding some specific data, but the video effect after compression is still in the range of specific data acceptable to the human eye.

The main principles of video compression coding are:
　　 Intra coding (transform coding and entropy coding): There is correlation between pixels. Image transformation to frequency domain can achieve decorrelation and energy concentration.

　　 Inter-frame coding (motion estimation and motion compensation): Divide the image into small blocks for prediction.

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]

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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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This is our participation in 2012 Global Sources Hong Kong Electronics Fair . Customers from all over the world finally have a chance to get together.

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You can search this numbers " 23.127460034623816,113.33224654197693 " in google map , then you can find our fmuser office .

FMUSER Guangzhou office is in Tianhe District which is the center of the Canton . Very near to the Canton Fair , guangzhou railway station, xiaobei road and dashatou , only need 10 minutes if take TAXI . Welcome friends around the world to visit and negotiate .

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