1. Collection
Audio collection The audio collection process mainly uses equipment to collect the analog signals in the environment into PCM-encoded raw data, and then encode and compress the data into MP3 and other formats for distribution. Common audio compression formats are: MP3, AAC, HE-AAC, Opus, FLAC, Vorbis (Ogg), Speex and AMR.
Image acquisition The image acquisition process is mainly captured by cameras and other equipment into YUV-encoded raw data, which is then encoded and compressed into H.264 and other format data for distribution. Common video packaging formats are: MP4, 3GP, AVI, MKV, WMV, MPG, VOB, FLV, SWF, MOV, RMVB, WebM, etc.
2. Treatment
After the video or audio is collected, the original data is obtained. In order to enhance some on-site effects or add some additional effects, we generally process it before encoding and compressing it.
Video beauty, watermark, path, customization
Audio mixing, noise reduction, special effects, customization
3. Coding and packaging
1. Coding
For streaming media transmission, encoding is very important. Its encoding performance, encoding speed, and encoding compression ratio will directly affect the user experience and transmission cost of the entire streaming media transmission.
Common video encoders:
1) H.264/AVC
2) HEVC/H.265
3) VP8
4) VP9
5) FFmpeg
Audio encoder: Mp3, AAC, etc.
2. Package
Mix and encapsulate the multimedia content (video, audio, subtitle, chapter information, etc.) generated by the encoder
Several common packaging formats:
1) AVI format (.avi suffix)
2) DV-AVI format (.avi suffix)
3) QuickTime File Format format (suffix .mov)
4) MPEG format (the file extension can be .mpg .mpeg .mpe .dat .vob .asf .3gp .mp4 etc.)
5) WMV format (suffix .wmv .asf)
6) Real Video format (suffix .rm .rmvb)
7) Flash Video format (.flv suffix)
8) Matroska format (suffix .mkv)
9) MPEG2-TS format (suffix .ts)
Currently, we mainly use FLV and MPEG2-TS formats in streaming media transmission, especially live broadcasts, which are used in RTMP/HTTP-FLV and HLS protocols respectively.
Four. Push to the server
There are three main push protocols:
RTSP (Real Time Streaming Protocol): Real Time Streaming Protocol, a multimedia streaming protocol used to control sound or video, jointly proposed by Real Networks and Netscape;
RTMP (Real Time Messaging Protocol): Real Time Messaging Protocol is an open protocol developed by Adobe for audio, video and data transmission between Flash players and servers;
HLS (HTTP Live Streaming): is an HTTP-based streaming media transmission protocol implemented by Apple Inc.;
RTMP is the current mainstream streaming media transmission protocol, which is widely used in the field of live broadcast. Most live broadcast products on the market adopt this protocol.
The RTMP protocol is based on TCP and is a network protocol designed for real-time data communication. It is mainly used for audio, video and data communication between the flash/AIR platform and the streaming media/interactive server supporting the RTMP protocol. Software that supports this agreement includes Adobe Media Server/Ultrant Media Server/red5, etc.
It has three variants:
RTMP works as a plaintext protocol on top of TCP, using port 1935;
RTMPT is encapsulated in the HTTP request and can traverse the firewall;
RTMPS is similar to RTMPT, but uses HTTPS connection;
The RTMP protocol is like a container used to hold data packets. These data can be data in AMF format or video/audio data in FLV. A single connection can transmit multiple network streams through different channels. The packets in these channels are transmitted in fixed-size packets.
V. Server streaming distribution
The function of the streaming media server is to be responsible for the publishing and rebroadcasting and distribution of live streaming.
Six. Player streaming
Mainly to realize the display of live programs on the terminal. Because the transport protocol used here is RTMP, any player that supports the RTMP streaming protocol can be used, such as:
Computer: VLC, etc.
Mobile terminal: Vitamio and ijkplayer, etc.
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Copyright statement: This article is the original article of the CSDN blogger "Yuan Jiao Shou", following the CC 4.0 BY-SA copyright agreement. Please attach the original source link and this statement for reprinting.
Original link: https://blog.csdn.net/xxtt0524/article/details/70332403
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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 .
At Fair
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.
Where is Fmuser ?
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 .
Contact: Sky Blue
Cellphone: +8618078869184
WhatsApp: +8618078869184
Wechat: +8618078869184
E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620
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English: We accept all payments , such as PayPal, Credit Card, Western Union, Alipay, Money Bookers, T/T, LC, DP, DA, OA, Payoneer, If you have any question , please contact me [email protected] or WhatsApp +8618078869184
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PayPal.  www.paypal.com
We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet .
Every of our item list page bottom on top have a paypal logo to pay.
Credit Card.If you do not have paypal,but you have credit card,you also can click the Yellow PayPal button to pay with your credit card.
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But if you have not a credit card and not have a paypal account or difficult to got a paypal accout ,You can use the following:
Western Union.  www.westernunion.com
Pay by Western Union to me :
First name/Given name: Yingfeng
Last name/Surname/ Family name: Zhang
Full name: Yingfeng Zhang
Country: China
City: Guangzhou
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T/T . Pay by T/T (wire transfer/ Telegraphic Transfer/ Bank Transfer)
First BANK INFORMATION (COMPANY ACCOUNT):
SWIFT BIC: BKCHHKHHXXX
Bank name: BANK OF CHINA (HONG KONG) LIMITED, HONG KONG
Bank Address: BANK OF CHINA TOWER, 1 GARDEN ROAD, CENTRAL, HONG KONG
BANK CODE: 012
Account Name : FMUSER INTERNATIONAL GROUP LIMITED
Account NO. : 012-676-2-007855-0
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Second BANK INFORMATION (COMPANY ACCOUNT):
Beneficiary: Fmuser International Group Inc
Account Number: 44050158090900000337
Beneficiary's Bank: China Construction Bank Guangdong Branch
SWIFT Code: PCBCCNBJGDX
Address: NO.553 Tianhe Road, Guangzhou, Guangdong,Tianhe District, China
**Note: When you transfer money to our bank account, please DO NOT write anything in the remark area, otherwise we won't be able to receive the payment due to government policy on international trade business.
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* It will be sent in 1-2 working days when payment clear.
* We will send it to your paypal address. If you want to change address, please send your correct address and phone number to my email [email protected]
* If the packages is below 2kg,we will be shipped via post airmail, it will take about 15-25days to your hand.
If the package is more than 2kg,we will ship via EMS , DHL , UPS, Fedex fast express delivery,it will take about 7~15days to your hand.
If the package more than 100kg , we will send via DHL or air freight. It will take about 3~7days to your hand.
All the packages are form China guangzhou.
* Package will be sent as a "gift" and declear as less as possible,buyer don't need to pay for "TAX".
* After ship, we will send you an E-mail and give you the tracking number.
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For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
Name: Liu xiaoxia
Address: 305Fang HuiLanGe HuangPuDaDaoXi 273Hao TianHeQu Guangzhou China.
ZIP:510620
Phone: +8618078869184
Please return to this address and write your paypal address,name,problem on note: |
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