Judging whether a set of one-to-one live broadcast source code is good or not, the quality is not up to standard, and the user experience is nothing more than the four aspects of delay, successful playback rate, first screen time consumption, and picture quality and clarity.
Next, the editor will explain them one by one.
1. Delays Latency refers to the time difference between sending and receiving under a stable network, that is, the content viewed on the playback end is the video content a few seconds ago, and the impact is more obvious for application scenarios that require relatively high latency. In the one-to-one live broadcast, the delays caused are nothing more than the following: 1. Physical delay: Insufficient network bandwidth or network jitter may cause this delay.
2. Logical delay: The live broadcast process is generally longer, and there are many forwarding modules. Each forwarding will cause network delay. The more forwarding links, the greater the delay.
3. Cumulative delay: The server generally opens up a buffer. When the network status is poor, the server will accumulate the live data packets.
When the network status is restored, the data packets that have been accumulated before will be sent together. Go out, so sometimes in a certain period of time, the live broadcast screen will appear "sudden acceleration", which is the performance of cumulative delay. As long as the above delay conditions are adjusted to the ms level through technical adjustments, the delay can be controlled within a reasonable range. 2. Successfully played The usability of the one-to-one live broadcast source code includes two aspects: one is to play successfully, and the other is to play continuously without jamming. The user can pull to the stream normally, play and watch, and the picture quality must not be abnormal. Specific requirements as follows:
1. Able to obtain video data.
2. Avoid delays in data acquisition.
3. Put an end to screen abnormalities, such as blurred, black and green screens.
If the frame rate is too low, the upload is blocked, or the downlink is not good, the above situation may be caused. To optimize these problems, you can only optimize from the streaming end and the playback end, such as choosing a better quality network, reasonable video encoding parameter settings, A suitable buffer size can avoid the above situation reasonably. Third, the first screen time-consuming The key indicator of the first screen time-consuming is the length of the first frame, which is defined as the time it takes to see the picture with the naked eye after the first on-demand playback. Technically, it refers to the time it takes for the player to decode the first frame to render the display screen. Generally speaking, "seconds to open" means that after clicking play, you can see the play screen within one second. The faster the first screen opens, the better the user experience. The time-consuming reasons for the first screen are mainly caused by DNS resolution, caching, and network delays. Fourth, the picture quality In the process of one-to-one live video encoding and decoding, there can be no significant distortion, and the quality and clarity of the picture need to be maintained to achieve the most basic user experience. The most basic principle is to make the bit rate slightly larger while ensuring that other parameters remain unchanged, so that the better the picture quality and the clearer the picture. At the same time, it is necessary to ensure the balance between the bit rate, resolution and frame rate to save costs. The above is the quality measurement index of one-to-one live broadcast source code. As for the problems that arise, the editor did not explain too much in this article. Later, I will answer further in other articles, and more articles of this type will be released in the future. Everyone, please pay attention.
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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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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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