Frame rate: FPS (how many frames per second); and GOP (how many I frames per second)
Bit rate: the size of the data encoded by the encoder per second, in Kbps. For example, 800kbps represents that the encoder generates 800KB (or 100kb) of data per second.
Resolution: the number of pixels contained in the unit inch; VGA: Video Graphics Array (video image resolution)
The three factors affect the quality of live broadcast
Frame rate: affects the fluency of the picture, which is proportional to the fluency of the picture: the larger the frame rate is, the smoother the picture is; the smaller the frame rate is, the more dynamic the picture is. If the code rate is a variable, the frame rate will also affect the volume. The higher the frame rate is, the more pictures pass per second. The higher the code rate is, the larger the volume is. Frame rate is the number of frames of pictures transmitted in one second, which can also be understood as the number of times that the graphics processor can refresh every second.
Resolution: affects the image size, which is proportional to the image size: the higher the resolution, the larger the image; the lower the resolution, the smaller the image.
definition
In the case of a certain bit rate, the resolution is inversely proportional to the definition: the higher the resolution, the less clear the image; the lower the resolution, the clearer the image.
The higher the code rate, the clearer the image; the lower the code rate, the less clear the image.
About the amount of data in a video stream:
If the bit rate is 10MB / s, it means that there is 10M bit video data in one second. For 1080p video in YUV422 format, one frame image is 1920x108x8 / 1024 / 1024= 31.64mbit, 30 frames per second, there is 949.2mb/s, which shows that the amount of data is so large that it can't be spread on the Internet without compression, so we must go through video compression processing, don't think 1080p video must be high-definition, and the definition is closely related to the video bit rate. For 1080p video, the bit rate of Blu ray video is 20MB / s, and most of the downloaded video bit rate It's 10MB / s. the bit rate of some IPcamera / UAVs is 2-8mb / s, while the bit rate of many video websites is even lower than 5m / S. in fact, sometimes it's not as clear as the high bit rate 720p.
Good image quality is the balance among resolution, frame rate and code rate
The larger the bit rate, the better
If we don't limit the bit rate, the higher the resolution, the finer the image quality; the higher the frame rate, the smoother the video, but the corresponding bit rate will also be very large, because more data is needed to carry higher clarity and fluency per second. This is a good thing for cloud service providers (revenue is proportional to traffic), but it may mean more expenses for you.
The frame rate should not exceed 24
If you limit a bit rate, such as 800kbps, the higher the frame rate, the encoder must increase the compression ratio of a single frame, that is, reduce the image quality to carry enough frames. If the video source comes from the camera, 24fps is already the limit of the naked eye, so the general 20 frame FPS can achieve a good user experience.
Some friends who have played 3D games may say that the higher the frame rate of the game, the smoother it is. Here we should pay attention not to confuse the scene: the goal of the game in pursuit of high frame rate is to make the motion effect rendered by the 3D model closer to the real motion track as much as possible, so the higher the frame rate, the better. But for the camera, its target is the real world objects, there is no refresh rate in the real world, so this theory is not applicable.
Resolution does not rise blindly
If a bit rate is limited, such as 800kbps, the higher the resolution is, the more "difficult" the encoder will be. It can be imagined that it has to break the wall to make up the wall. It can carry enough pixels by reducing color information or introducing mosaic as a "fish eye mixed ball" means. Therefore, the same 2G movie file, 1080p image quality version may not be as clear as 720p image quality version.
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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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