HTTP Live Streaming (HLS) is an HTTP-based streaming media transmission protocol implemented by Apple Inc., which can realize live and on-demand streaming media. It is mainly used in the iOS system to provide audio for iOS devices (such as iPhone and iPad). Live video and on-demand programs. HLS on-demand is basically the common segmented HTTP on-demand. The difference is that its segments are very small. To achieve HLS on-demand, the focus is on segmenting media files. There are currently many open source tools that can be used. I will not discuss here, just talk about HLS live broadcast technology.
Compared with common streaming media live broadcast protocols, such as RTMP, RTSP, MMS, etc., the biggest difference of HLS live broadcast is that what the live broadcast client obtains is not a complete data stream. The HLS protocol stores the live data stream as continuous, short-duration media files (MPEG-TS format) on the server side, and the client continuously downloads and plays these small files, because the server side will always update the latest live broadcast The data generates new small files, so as long as the client continuously plays the files obtained from the server in sequence, the live broadcast is realized. It can be seen from this that, basically, it can be considered that HLS is a technical way of on-demand to achieve live broadcast. Because the data is transmitted through the HTTP protocol, there is no need to consider firewalls or proxy issues at all, and the duration of the segmented file is very short, and the client can quickly select and switch the code rate to adapt to playback under different bandwidth conditions. However, this technical characteristic of HLS determines that its delay is generally higher than that of ordinary streaming media live broadcast protocols.
HLS protocol specification to generate segmented standard TS files and m3u8 index files
P2P playback technology
Computer A orders a video vedio, the server records it, and queries which computer around computer A is also watching the video, and finds computer B. At this time, computer B is used as a CDN to provide resources for computer A
CDN: content acceleration
hls is a normal video
drm is a digital copyright protection video
https is a tunnel outside
The difference between http and https
The data transmitted by the tunnel established after a series of handshake operations will be symmetrically encrypted/decrypted, which involves 6 keys and is a short period, so it is safe. HTTP and https use completely different connection methods and use different ports. The former is 80 and the latter is 443. The http connection is very simple and stateless,...The HTTPS protocol is a network protocol constructed by the SSL+HTTP protocol that can be encrypted transmission and identity authentication is safer than the http protocol
HLS vs. RTMP, RTSP comparison
You should be talking about HTTP Live Streaming [1]. This is a technology developed by Apple to improve streaming efficiency. It is characterized by dividing the streaming media into several TS segments (for example, one segment every 10 seconds), and then collecting these TS segments through an extended m3u list file for the client player to receive .
The advantage of this method compared to using the RTSP protocol is that once the segmentation is completed, the subsequent distribution process does not need to use any special software at all. The ordinary network server is enough, which greatly reduces the configuration requirements of the CDN edge server, and you can use any off-the-shelf CDN. The protocol used for distribution is the most common HTTP. The cache optimization of this protocol by proxy servers is quite mature, while few proxy servers optimize the cache of RTSP. This has considerable advantages for playing (soft) real-time video, because after such distribution, the load pressure on the source server is much less.
There are three kinds of streaming media protocols: rtmp, rtsp, http live streaming (one for apple and one for adobe)
Rtmp is adobe, rtsp android native support, http live streaming (hereafter referred to as hls) is of course Apple’s main feature, and then adobe finally supports it.
Both rtmp and rtsp require special servers, for example, rtmp requires FMS/red5, rtsp requires darwin, etc., hls only requires ordinary servers, and the benefits are very clear on the first floor.
RTMP live application and delay analysis
In live broadcast applications, RTMP and HLS can basically cover all clients to watch,
The main advantage of HLS is that the delay is relatively large, and the main advantage of RTMP is that the delay is low.Comparison of streaming media distribution methods
Compare the following streaming media distribution methods used on the Internet:
. HLS: Apple's HLS, supports on-demand and live broadcast.
. HTTP: HTTP stream, http stream defined by each company, applied to domestic video-on-demand websites.
. RTMP: Live application, which has certain requirements for real-time performance, mainly PC.
RTMFP RTMFP M3U8 VOD based on UDP.
By using RTMFP, applications that rely on live broadcast and real-time communication, such as communities, audio and video chat, and multiplayer games, have the ability to release high-quality communication solutions. RTMFP allows end users to directly connect and communicate, and chat directly with a microphone and camera. RTMFP will not support file and document sharing. This solution improves the current Flash Player experience in network interaction.
RTMFP will reduce the bandwidth consumption of live broadcast and real-time chat solutions, such as audio and video chat and multiplayer games. Because RTMFP data flows between end users instead of servers, this solution is very suitable for large-scale deployment. RTMFP also improves the transmission speed because of the use of UDP. UDP is a more effective way to transmit audio and video on the Internet, although there will be some packet loss and error packets. RTMFP has two features that can help solve some connection errors.
Fast connection recovery: The connection will recover quickly in an unexpected situation. For example, if a wireless connection is dropped, once reconnected, he will quickly have all the transmission capabilities.
IP dynamics: An active network session will be identified by PEER, even if it changes an IP, the original session can be maintained. For example, if a laptop obtains a new IP address on a wireless network, it will immediately continue the conversation.
Difference between RTMP and RTMFP
The most basic thing is indeed the protocol they use on the network. RTMFP is based on UDP, and RTMP is based on TCP. UDP still has more advantages than TCP in transmitting live data, such as reducing delay and tolerance to packet loss, although there is a loss in reliability. Unlike RTMP, RTMFP supports Flash Player to send data directly to another without going through the Server. The server connection will be used to initialize and exchange some information between clients. It can also be used to make server calls or as a gateway to other systems. FMS will also be used to provide users with address authentication services and NAT address translation services to prevent users from falling into confusion.
The Cirrus (Stratus) super node service provided by Adobe helps independent Flash Player nodes log in to obtain the ID of the P2P overlay network (overlay), and assist in penetrating firewalls. Users can build a separate Tracker service to help screen nodes, or directly use RTMFP's group service to share data using multicast.
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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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