2 The main solution of streaming technology
Due to its mature and stable technical performance, Internet giants such as America Online (AOL), ABC, AT&T, Sony and TIme Life and other major online radio stations use RealSystem to deliver real-time audio-visual media information and real-time music broadcasts to all parts of the world. In my country, a large number of movies, music on demand, and online live broadcasts of the Spring Festival Gala and the opening ceremony of the Kunming World Expo all use the RealSystem system.
Windows Media Technology is an information streaming program proposed by Microsoft. Its main purpose is to realize the transmission of multimedia streaming information including audio and video information on the Internet and Intra-net. Its core is the ASF file. ASF is a data format that contains multimedia information such as audio, video, image, control commands, scripts, etc., which is transmitted over the Internet by dividing into individual network data packets to realize streaming multimedia content publishing. Therefore, the content transmitted on the network is called ASF Stream. ASF supports any compression/decompression coding method, and can use any underlying network transmission protocol, which has great flexibility. Microsoft has bundled Windows Media technology into Windows 2000 and intends to use ASF as the standard file format for multimedia content in future versions of Windows. This will undoubtedly have a significant impact on the Internet, especially the application and development of streaming technology.
Windows Media Technology consists of Media Tools, Media Server and Media Player tools. Media Tools is an important part of the entire program. It provides a series of tools to help users generate multimedia streams in ASF and formats. They are divided into creation tools and editing tools. The creation tools are mainly used to generate multimedia streams in ASF format, including Media. Encoder, Author, VidToASF, WavToASF, Present-ter five tools; editing tools mainly edit and manage multimedia stream information in ASF format, including post-production editing tools ASF Indexer and ASFChop, as well as check and correct errors in ASF streams ASF-Check. Media Server can guarantee the confidentiality of files, not to be downloaded, and enable every user to browse the web with the best video quality, and has a variety of file release forms and monitoring and management functions. Media Player provides powerful streaming information playback function.
Apple began to release QuickTIme in 1991. It supports almost all mainstream personal computing platforms and various formats of static image files, videos and animation formats. It has built-in Web browser plug-in technology, supports IETF streaming standards and RTP, RTSP, SDP , FTP and HTTP and other network protocols. Many new movie clips retrieved through Hollywood Studios are stored in QuickTime format.
QltickTime includes a server, QuickTime Player with editing functions, a producer, an image browser, and a QuickTime plug-in that enables an Internet browser to play QuickTime movies. QuickTime 4 supports two types of streaming: real-time streaming and quick-start streaming. QuickTime movies that use real-time streaming must be played from a server that supports QuickTime streaming. It is a real Streaming Media and uses Real-Time Transport Protocol (RTP) to transmit data. Quick start movies can be played from any Web Server, using Hypertext Transfer Protocol (HTTP) or File Transfer Protocol (FTP) to transfer data.
At present, FOX News Online, FOX Sports Online, BBCWORLD, Weather Channel and other institutions have joined the ranks of QuickTime content providers, using QuickTime technology to produce live broadcast programs. In addition to the three main formats of the above-mentioned streaming media technology, in terms of multimedia courseware and animation The streaming media technology of Macromedia also includes Shock-wave technology of Macromedia and Meta Stream technology of MeataCreation company.
Through Shockwave technology, operations such as images, animations, and interactive interfaces can be easily added to Web pages. With this kind of Streaming Shockwave, the user can realize the function of downloading and playing on the client side by means of streaming, which saves the waiting time. Shockwave and Macromedia products are closely linked, including Flash, Shockwave for Authorware, Shockwave for Di-rector and other technologies.
The graphics design software of MetaStream 3D is Ray Dream studio 5 and Ray Dream 3D, which can easily create, publish and browse zoomed 3D graphics on the Internet. It has the characteristics of small file size and streaming, which is more existing than any other kind. The Internet 3D technology has a high compression rate. Mainly used in game developers, page designers, e-commerce, scientific researchers, professional designers, etc.
3 Application of Streaming Media Technology in Internet TV
At present, my country's communications industry is developing rapidly, and users are increasingly demanding information services, especially broadband video information. It can be said that China has basically possessed the technical conditions and market conditions for vigorously developing IPTV, and the competition in the IPTV network TV market has become increasingly fierce. Market competition is more beneficial to ordinary consumers. Regardless of this, the concern here is how to realize network TV. For general users, network set-top boxes + ordinary TV sets are generally used. As shown in Figure 2, the computer and the set-top box share an ADSL Modem for broadband Internet access. Usually ADSL user's computer and ADSL Modem are in the same place, therefore, ADSL Modem leads to Category 5 network cable to connect to the set-top box. Considering that most ADSL Modem has only one 10BaseT network port, one more HUB should be added. Internet TV can provide services such as distance education, video-on-demand, web live broadcasting, and video conferencing, making people's lives more colorful. The following will discuss the application of streaming media from these aspects.
3.1 Distance education
The popularization of computers, the development of multimedia technology and the rapid rise of the Internet have brought new opportunities to distance education. Countries all over the world are vigorously developing distance education including online education. In the process of remote teaching, the most basic requirement is to transfer information from the teacher to the remote student. The information that needs to be transferred may be diversified, including various types of data: such as video, audio, text, and pictures. Wait. Passing these materials from one end to the other is a problem that distance education needs to solve, and how to effectively combine these information materials to achieve better teaching results is an important aspect of people's thinking. Due to the limitation of current network bandwidth, streaming media is undoubtedly the best choice. Students can participate in remote teaching through a computer, a telephone line, and a modem at home. For teachers, there is no need to do too much preparation. The teaching method is basically the same as the traditional teaching method, except that the camera and the computer are faced.
At present, most of the technologies that can be used for multimedia interactive teaching on the Internet are streaming media. Technologies such as RealSystem, Flash, and Shockwave are often used in network teaching. Distance education is a revolution to the traditional education model. It integrates teaching and management, breaks through the limitations of traditional "face-to-face instruction", and provides convenience for learners in terms of space and time.
In addition to real-time teaching, the use of VOD (Video on Demand) technology in streaming media can also achieve the purpose of teaching students in accordance with their aptitude and interactive teaching. Students can also share their learning experience and results through the Internet. Large enterprises can use streaming technology-based distance education systems as a means of training employees. Not only video and audio can be used here, but also graphics captures from computer screens can also be streamed to students. Now Microsoft itself uses a large number of its own streaming technology products as a means of training and communicating with employees in its global branches. With the development of network and streaming media technology, more and more distance education websites begin to adopt streaming media as the main online teaching method.
3.2 Broadband network video on demand
VOD video-on-demand was mentioned in the previous distance education. Video-on-demand technology is not a new concept. The original VOD was applied to karaoke on-demand. At that time, the VOD system was semi-automatic and required manual participation. With the development of computers, VOD technology has gradually been applied to local area networks and cable television networks. At this time, the VOD technology is becoming more and more perfect, but there is a difficulty that hinders the development of VOD technology, that is, the huge capacity of audio and video information. In this way, the server side not only requires a large amount of storage system, but also loads a large amount of data transmission, which makes the server unable to perform large-scale on-demand. At the same time, due to the small coverage of VOD in the local area network, users cannot listen to or watch programs in the local area network through network media such as the Internet. At this time, the emergence of streaming media technology can completely abandon the local area network and use the Internet in terms of video-on-demand. Because the streaming media has undergone special compression coding, it is very suitable for transmission on the Internet. The client uses a browser for on-demand broadcast, basically no maintenance. Due to the use of advanced cluster technology, large-scale concurrent on-demand requests can be processed in a distributed manner, making it suitable for large-scale on-demand environments.
With the development of broadband networks and information appliances, streaming media technology will be more and more widely used in video-on-demand systems. Perhaps one day you can also enjoy streaming video programs equivalent to TV programs in your own home. At present, many large-scale news and entertainment media provide streaming technology-based audio and video programs on the Internet, such as foreign CNN, CBS, my country’s CCTV, Beijing TV, etc. Some people broadcast this on the Internet. The program is called "Webcast".
3.3 Internet live broadcast
Perhaps everyone has only heard of terms such as live broadcasting and satellite broadcasting. They are not very familiar with the concept of Internet broadcasting (or web broadcasting). With the popularity of the Internet, more and more netizens are watching directly from the Internet. Sports events, major celebrations, and trade exhibitions have become the wishes of many netizens. Many manufacturers hope to spread their products and activities all over the world by means of live webcasts, which may not be achieved by any kind of media. All this contributed to the formation of Internet live broadcast. However, the problem of network bandwidth has always plagued the development of Internet live broadcast. However, with the continuous popularization of broadband networks and continuous improvement of streaming media technology, Internet live broadcast has moved from the experimental stage to the practical stage, and can provide more satisfactory audio and video effects. Streaming media technology plays an important role in Internet live broadcast. First, streaming media realizes the provision of high-quality audio and video in a low-bandwidth environment. Secondly, smart streaming technologies like Real's SureStream can ensure that users with different connection rates can get different quality audio and video effects. In addition, Streaming Media's Multicast (multi-address broadcast) technology can greatly reduce the load on the server side, while saving bandwidth to the greatest extent. Regardless of technical considerations or market considerations, Internet live broadcast is now the most mature of many streaming media applications. Many companies already provide online live broadcast services, and the annual "Spring Festival Gala" provides online live broadcasts.
3.4 Video conference
There are many video conferencing systems on the market, and these products basically support the TCP/IP network protocol, but the systems that use streaming media technology as the core technology do not account for the majority. Video conferencing technology involves multiple technologies such as data collection, data compression, and network transmission. Streaming media is not a necessary choice for video conferencing, but the emergence of streaming media technology has played an important role in the development of video conferencing. Using streaming media format to transmit video and audio, users can watch continuously in real time without waiting for the transmission of the entire movie. This not only improves the waiting problem before watching, but also achieves real-time effects. Although some picture quality is lost, as far as video conferencing is concerned, high audio and video quality is not required. Video conferencing is a commercial use of streaming media. Point-to-point communication can also be carried out through streaming media. The most common example is videophone. As long as there is a computer connected to the Internet and a camera, you can communicate with people anywhere in the world in audio and video. In addition, large enterprises can use streaming technology-based video conferencing systems to organize cross-regional meetings and discussions, thereby saving a lot of expenses. A practical example is that the second largest securities dealer in the United States has adopted the streaming technology solution provided by Starlight Network since 1998 to provide real-time information to its branch brokers and investment consultants in more than 500 cities and regions around the world. Desktop financial news enables their customers to get more investment profits.
4 Conclusion
With the continuous development of network communication, IPTV is bound to become a development trend. As one of the key technologies of IPTV, streaming media technology has attracted much attention for its development and application. Although there are many similarities between the streaming media service system and the traditional network file service system, the streaming media technology emphasizes the access support for high-speed, stable and borderline search streams, as well as the support for the synchronization of different media, so as to ensure The media data arrives with minimal delay and is played back synchronously on the local terminal. Because the current streaming media service system has strict requirements for continuity and real-time performance, as well as a huge demand for data, the current stage of the network is still somewhat avoidable. With the further development of computer networks, the continuous expansion of network bandwidth, and the continuous improvement of network multimedia platforms, streaming media technology will certainly play a greater role in future network applications. Just as the original image processing requirements have affected computers, it is foreseeable that streaming media service systems will also have a significant impact on the hardware and software design of networks and terminals.
|
|
|
|
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: |
|
