In live streaming, due to network limitations, the picture will be blurred or stuck. These problems are often related to the set parameters. It is not that the larger the value, the better. Reasonable adjustment of parameters in different application scenarios and different network environments can maximize the needs of live broadcast. Ucast can remotely control the Ucast device through the mobile phone APP or applet, inquire about the device status and set various parameters in real time during the live broadcast.
If you want to adjust the parameters, you must first understand the meaning of the parameters:
Resolution
Resolution is the size of a picture's pixels, common ones are 480, 720, 1080, etc. The larger the resolution, the clearer the picture, and the larger the memory required for an image.
Bit rate
kbps (kilobit per second) is a measure of speed, and it can also be written as kb/s. The unit of video bit rate is kbps, kilobits per second. When streaming through the network, the lower the bit rate setting, the less the content to be transmitted and the less network fluctuations will be affected, but the picture quality will decrease. The higher the relative bit rate setting, the better the picture quality, but the higher the network requirements. Setting a bit rate that is too high when the network is unstable can easily cause a freeze.
Frame rate (FPS)
The video picture is composed of countless pictures, each picture is a frame, the number of pictures is called the number of frames, the number of pictures per second is called the frame rate, commonly known as FPS. The frame rate is very important for video. For video consistency, the minimum is generally 30. The larger the frame rate, the smoother the video looks and the greater the amount of storage required, but after exceeding a critical point, the human eye cannot distinguish the difference.
Bit rate type
CBR: The abbreviation of Constant BitRate, which means constant (fixed) bit rate, which means that the bit rate of the file per second is fixed. The characteristic of CBR is that the code rate is stable, and the fixed code stream control can reduce the influence of network jitter, and it is suitable for web live broadcast.
VBR: The abbreviation of Variable BitRate, which means variable bit rate, which means that the bit rate of the file can be changed per second. The characteristic of VBR is that the code rate fluctuates greatly, but it saves space and is mainly used for storage. It can also be used under very good network conditions.
Encoding Profile
From high to low: High, Main, Baseline
High: The level adds 8x8 internal prediction, custom quantization, lossless video coding and more YUV formats (such as 4:4:4) on the basis of Main for broadcasting and video disc storage (Blu-ray movies), high-definition TV application.
Main: Level provides I/P/B frames, supports non-interlaced (Progressive) and interlaced (Interlaced), and also provides support for CAVLC and CABAC, used for mainstream consumer electronic product specifications, such as live video encoders, portable video playback , PSP and Ipod, etc.
Baseline: Level supports I/P frame, only supports non-interlaced (Progressive) and CAVLC, generally used for low-level or need additional fault tolerance applications, such as video calls, mobile phone video, etc.
Key frame interval
Video is composed of dozens or even hundreds of pictures per second, forming a continuous picture, but in a short period of time, most pictures are actually similar. It is completely possible to store only part of the pictures and calculate the pictures dynamically during playback, so we Find a way to reduce the size of the video.
In actual application, these pictures are grouped, and several frames form a group, and one picture is kept in each group. Each group is called a GOP, and a complete picture reserved in the GOP is called a key frame. Knowing the key frame, the key frame interval is easy to understand, which means how many seconds to encounter a key frame.
Increasing the length of the GOP is beneficial to reduce the volume. But the GOP length cannot be too large, too large will cause the picture of the rear frame of the GOP to be distorted, and the recovery time will be longer after the frame is dropped, and the picture must be restored until the next key frame. If the GOP is too small, the size of the generated code stream will exceed the set bit rate, and it will also cause network choppiness and playback lag.
At last
The rough meaning of the parameters should be understood. Open the Ucast APP or applet, and click "More Settings"> "Live Streaming Settings" to set the device. Due to various factors such as application scenarios and network environment, we cannot give a standard parameter to set up all situations.
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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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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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