1. Personal opinion (difficult and easy to live broadcast)
Difficulty in live broadcast: I personally think that if you want to start live broadcast from scratch, it is definitely a great player in the world, because there are so many technical difficulties in the live broadcast, such as video/audio processing and graphics processing. , Video/audio compression, CDN distribution, instant messaging and other technologies, each technology is enough for you to learn for several years.
Live Streaming: There are already big talents in various fields, and many awesome frameworks have been packaged. We only need to use the frameworks written by others to quickly build a live broadcast app, which is the legendary standing on the shoulders of big cattle Programming.
Second, understand the live broadcast
1. A complete live streaming app function (from 落影 loyinglin sharing)
1. Chat
Private chat, chat room, light up, push, blacklist, etc.
2. Gift
Ordinary gifts, luxury gifts, red envelopes, rankings, third-party recharge, in-app purchases, gift dynamic updates, cash withdrawals, etc.;
3. Live broadcast list
Follow, popular, latest, classified live broadcast user list, etc.;
4. Live broadcast by yourself
Recording, streaming, decoding, playback, beautification, heartbeat, background switching, host to administrator operation, administrator to user, etc.;
5. Room logic
Create room, enter room, exit room, close room, switch room, room manager settings, room user list, etc.;
6. User logic
Ordinary login, third-party login, registration, search, modify personal information, watch list, fan list, forget password, view personal information, income list, follow and check, search, etc.;
7. Watch the live broadcast
Chat information, scrolling barrage, gift display, loading interface, etc.;
8. Statistics
APP business statistics, third-party statistics, etc.;
9. Super tube
Banned, hidden, audited, etc.;
2. The principle of a complete live streaming app
Live broadcast principle: Push the video recorded by the host to the server, and then the server will distribute it to the audience for viewing.
Live streaming: push streaming (collection, beauty processing, encoding, push streaming), server processing (transcoding, recording, screenshot, pornography), player (pull streaming, decoding, rendering), interactive system (chat room) , Gift system, praise)
3. A complete live streaming app implementation process
1. Acquisition, 2. Filter processing, 3. Encoding, 4. Push streaming, 5. CDN distribution, 6. Pull streaming, 7. Decoding, 8. Play, 9. Chat interaction
(2)
4. A complete live broadcast app architecture (3)
5. Technical points of a complete live broadcast app (4)
3. Understand streaming media (streaming media is required for live broadcast)
Streaming media development: the network layer (socket or st) is responsible for transmission, the protocol layer (rtmp or hls) is responsible for network packaging, the encapsulation layer (flv, ts) is responsible for the encapsulation of codec data, and the coding layer (h.264 and aac) is responsible for the image , Audio compression.
Frame: Each frame represents a still image
GOP: (Group of Pictures) picture group, a GOP is a group of continuous pictures, each picture is a frame, a GOP is a collection of many frames
The live data is actually a set of pictures, including I-frames, P-frames, and B-frames. When the user watches them for the first time, they will look for the I-frames, and the player will go to the server to find the nearest I-frames and feed them back to the user. Therefore, GOP Cache increases the end-to-end latency because it must get the nearest I frame. The longer the GOP Cache length, the better the picture quality
Bit rate: The amount of data displayed per second after the picture is compressed.
Frame rate: The number of pictures displayed per second. Affects the smoothness of the picture and is directly proportional to the smoothness of the picture: the larger the frame rate, the smoother the picture; the lower the frame rate, the more jumpy the picture.
Due to the special physiological structure of the human eye, if the frame rate of the picture being viewed is higher than 16, it will be considered to be coherent. This phenomenon is called persistence of vision. And when the frame rate reaches a certain value, if it increases again, it is not easy for the human eye to perceive a significant increase in fluency.
Resolution: (rectangular) the length and width of the picture, that is, the size of the picture
Data per second before compression: frame rate X resolution (unit should be several bytes)
Compression ratio: The amount of data per second/bit rate before compression (For the same video source and using the same video encoding algorithm, then: the higher the compression ratio, the worse the picture quality.)
Video file format: the suffix of the file, such as .wmv, .mov, .mp4, .mp3, .avi,
Main use, according to the file format, the system will automatically determine which software to open,
Note: Modify the file format at will, it will not have much impact on the file itself, such as changing avi to mp4, the file is still avi.
Video encapsulation format: a container for storing video information. Streaming encapsulation can include TS, FLV, etc., indexed encapsulation includes MP4, MOV, AVI, etc.,
Main function: A video file often contains images and audio, as well as some configuration information (such as the association of images and audio, how to decode them, etc.): these contents need to be organized and packaged according to certain rules.
Note: You will find that the packaging format is the same as the file format, because the suffix of the general video file format uses the name of the corresponding video packaging format, so the video file format is the video packaging format.
|
|
|
|
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
|
|
|
|
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
-
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.
---------------------------------------------------------------------
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
|
---------------------------------------------------------------------
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
---------------------------------------------------------------------
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.
|
|
|
|
* 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.
|
|
|
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: |
|
