In recent years, with the increase in bandwidth requirements in video fields such as live broadcast and short video, and the intensification of competition in the CDN industry, many CDN companies have begun to develop in the direction of P2P-CDN. P2P-CDN has always been an excellent solution in reducing costs and accelerating video services.
Today, I will use the HLS protocol as an entry point to explain the P2P-CDN project-PrismCDN.
Live P2P-CDN is usually used to transmit FLV protocol video. Why did Paiyun develop P2P-CDN that supports HLS transmission protocol? Because some customers use the Web player, they don't want to use the FLV protocol. In order to meet the needs of customers, P2P-CDN has made HLS adaptation to P2P-CDN so that it can support the HLS protocol.
First look at HLS and HLS+. Although HLS has been widely used, its average delay is 10-30 seconds, which has the disadvantage of high delay. The HLS+ technology reduces the delay to 4 seconds by slicing and trans-encapsulating the video at the edge node of the CDN. Currently, PrismCDN has fully supported HLS+ services.
P2P-CDN supports HLS implementation principle
Taking PrismCDN as an example, the current practice is that P2P-CDN needs to be a P2P downloader SDK, and then download data through the P2P protocol, and at the same time use the CDN server to supplement the data download, and get the intermediate result—FLV data stream. Then the SDK is locally transferred and encapsulated, converted into M3U8 and TS data streams, and finally HTTP service is provided on the local IP address 127.0.0.1, and finally the player can access the HLS data stream.
△PrismCDN supports HLS protocol process
The way that PrismCDN supports the HLS protocol is similar to the way that HLS+ reduces latency. HLS+ slices at CDN edge nodes, while PrismCDN completes slices and transmits FLV data streams locally on the client.
The idea of P2P HLS is the same as HLS+. Each TS segment is cut very small, and the TARGETDURATION is made 1 second, so that the end-to-end delay is 4 seconds.
High efficiency and low price, the secret under the unique live broadcast architecture
The above mainly explained the local transfer encapsulation of the HLS protocol, which is the most critical data stream transmission method compared to P2P-CDN.
△ Another cloud PrismCDN live broadcast architecture
First, the anchor pushes the live stream to the CDN server through the RTMP protocol, and the CDN server will instantly push one-twentieth of the data stream to fog nodes such as optical modems, routers, and set-top boxes. The fog node then forwards the data to the SDK downloader. The downloader then supplements the data to the CDN server, and finally composes the FLV stream.
The key point of PrismCDN data transmission is to rely on the upstream capabilities of fog nodes such as optical modems and routers to provide CDN bandwidth, thereby reducing the supplementary data flow of CDN servers. Most of the data is forwarded through the fog node, ultimately achieving the goal of saving costs.
Unique live broadcast model creates low latency
Compared with other P2P products, the biggest feature of PrismCDN is its low latency.
P2P live broadcasting has a history of many years. As early as 2004, P2P technology was already used in the web TV live broadcast application, and some TV station signals were put on the Internet for live broadcast. However, limited by technology, the P2P live broadcast delay was quite large at that time.
Why was the P2P live broadcast delay in 2004 so large?
This is because the live broadcast format data stream at that time downloads data from the top-level playback node and CDN, and then delivers it to each lower-level node layer by layer. This kind of live tree structure floods the data all the way, causing a very large delay.
PrismCDN does not need to build a live broadcast tree, only one layer of live broadcast model can achieve the effect of a relatively high P2P account. In the one-layer model, the end-to-end delay is within 3 seconds. With such a delay, the current live broadcast services on the market, such as game live broadcasts and show live broadcasts, can all be implemented with PrismCDN.
To sum up, PrismCDN low-latency technology mainly simplifies the data transmission model.
△The traditional P2P live broadcast tree is on the left, and the PrismCDN live broadcast model is on the right.
90% sharing rate achieves low latency and low cost features
The share ratio of PrismCDN nodes is more than 90%. The key to increasing the share ratio is the introduction of third-party equipment to supply data. Compared with traditional live broadcast trees, PrismCDN does not have the limitation of "the player is the supplier". For example, if there are 10,000 concurrent players, the traditional live tree structure cannot support sharing bandwidth with other users while playing, especially when the data pressure is high. PrismCDN has increased the number of third-party devices, increased the supply of upstream bandwidth, and reduced the pressure on CDN nodes, thereby increasing the node sharing ratio.
The key to PrismCDN's ability to improve fluency lies in the UDP protocol. Compared with the TCP protocol, the UDP protocol has more room for optimization. In the actual test, we let some nodes use TCP to run, and some other nodes use UDP to run. Compared with TCP, UDP can improve fluency by 5%.
In terms of fog node selection, with the help of an intelligent scheduling system, the nearest node is selected to solve the interconnection and interoperability problems between operators and avoid cross-operator situations.
Various tests to determine the most suitable parameters
The indicators of low latency, high sharing rate, and fluency in PrismCDN are very important. However, several of these indicators are contradictory, such as sharing rate and fluency. How to improve the fluency while increasing the sharing rate? We are adjusting these parameters during the development process, and constantly looking for suitable parameters through large-scale AB testing of the online system, finding the right time to supplement the data, how many nodes are used to transmit data, and how many redundant nodes are used.
future development
In addition to P2PHLS, YouPaiyun is also developing WebP2P, which will use WebRTC, DataChannel, MSE, Webassembly and other technologies. When we go to sell P2P products, there will indeed be some resistance in the market, because customers may not trust the P2P products of the SDK, including its upgrade and distribution channels, and how to roll back if something goes wrong. But if you use WebP2P to do it, customers will feel more at ease. If there is a problem with the P2P system, you can quickly roll back to the old version.
|
|
|
|
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: |
|
