Audio and video encoder refers to a network transmission device that compresses digital video and processes audio and video data. In the process of network transmission, what is more important is whether there is a difference in the clarity of the video picture and the broadband in the process of video processing. Let's learn more about the basic knowledge of audio and video codecs:
1. Explain the basic knowledge of audio and video codecs in detail
(1) Frame rate: The so-called frame rate refers to how many images there are in one second, and a video is composed of one image. Therefore, there is a concept of frame rate in the acquisition and playback encoding. That is to say the frequency (rate) of the video on the display. The higher the acquisition frame rate, the better the degree of restoration.
(2) Bit rate: Bit rate is the concept of video transmission. It refers to the bit rate transmitted per second and how much data is sent in one second. In real-time applications, adaptive bandwidth has always been the goal of the encoder rate control algorithm. For the encoder, it is the concept of compression rate, such as the amount of binary data after a frame of video (an image) is encoded and compressed. In channel coding, a source data block with a size of K symbols is mapped into a codeword with a size of N symbols through coding, and then K/N becomes the code rate.
(3) Resolution: Resolution is video clarity, ultra-clear, high-definition and the like. The most common are:
①The code stream required for 720P (Super HD) source is 4M
②The code stream required for 1080P (full HD) source is 8M
③The code stream required for 4K (Ultra HD) source is 10M
(4) Lossy/lossless coding: In the digital compression technology, lossless and lossless coding applications can be seen everywhere, the information in the transmission process is not damaged by the coding method to completely restore the original information, which is lossless coding. Lossy coding is more common in image, video, audio, and other multimedia information compression. Because the original information of multimedia information is too large, it will lose undetectable information during the encoding process, and the lost data cannot be recovered, and the compression is relatively large.
(5) H.264/H.265 coding technology
H.264 encoding is a low-latency high-definition video image processing algorithm, the standard H.264 video compression algorithm; H.264 can achieve standard-definition digital image transmission at a speed lower than 2Mbps, while H.265 HighProfile can be used at a speed lower than 1.5Mbps Under the transmission bandwidth, 1080p full HD video transmission can be realized. Both H.264 encoding and H.265 encoding are video encoding formats. Compared with H.264, H.265 can transmit higher-quality network video under limited bandwidth, which means that only half of the bandwidth of the original H.264 encoding can transmit the same quality video.
2. The role of audio and video encoders
(1) Video encoders are mainly used in high-definition digital TV adjacent-frequency front-end systems, IPTV live broadcast systems and digital high-definition coding for web live broadcasts.
(2) As long as it is a digital video, it needs to be transmitted by a high-definition signal through a video encoder, and zero delay is better for live broadcast.
(3) The live encoder can receive HDMI high-definition digital signals from HDMI high-definition cameras, HDMI set-top boxes, and computer hosts through the HDMI video input interface. After the encoder receives the video signal, it can use the built-in professional video processor to encode the video information, and after the encoder processing is completed, it can be pushed to the live server through the WIFI network.
Video encoder: is a compression program.
Video decoder: is a decompression program.
3. Mainly used in scenes
Software and hardware supporting services under various environmental conditions such as video conferencing, security monitoring, medical teaching, classroom recording and broadcasting, and court hearing systems. In communications and networks, it is also suitable for real-time system control, industrial automation, real-time data acquisition, military systems, etc. that require high-speed computing, intelligent transportation, and aerospace.
4. Which audio and video codec is better?
The goal of video compression is to reduce the video data rate while ensuring the visual effect as much as possible. Video codecs require high stability and real-time transmission, it is best to choose professional factory direct sales, with professional R & D team technology. At the same time, there must be higher compatibility, and various types of network video codecs.
Supported protocols, and common RTMP/HLS/RTP/RTSP/NDI/SRT and other multi-protocol output.
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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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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.
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* 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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