Video Streaming is flow of videos through internet that gives students and teachers access to more than 15,000 full-length and 150,000 clips of core-curriculum, standards-based video programs instantly along with maps, charts, tests and many other instructional resources – over the school districts Wide Area Network (WAN). When the Streaming video is usually sent from pre-recorded video files, but can be distributed as part of a live broadcast “feed.” In a live broadcast, the video signal is converted into a compressed digital signal and transmitted from a special Web server that is able to do multicast, sending the same file to multiple users at the same time
Streaming video is content sent in compressed form over the Internet and displayed by the viewer in real time. With the help of streaming video a Web user does not have to wait to download a file to play it. Instead, the media is sent in a continuous stream of data and is played as it arrives. User needs a player by which sends video data to the display and audio data to speakers.
The Major streaming video and streaming media technologies include Real system G2 from Real Network, Microsoft Windows Media Technologies and VDO. Microsoft’s approaches use proprietary algorithms.
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Two main methods of streaming video: Streaming servers (true streaming) and HTTP streaming. This tutorial is suitable for people who are familiar with basic digital video concepts, and who understand how websites work (see our video tutorials and internet tutorials for more information). When creating streaming video, there are two things you need to understand: The video file format and the streaming method.
There are many video file formats to choose from when creating video streams. The most common formats are :-
4.MPEG (in particular MPEG-4)
There are two ways to view media on the internet (such as video, audio, animations, etc): Downloading and streaming.
When you download a file the entire file is saved on your computer (usually in a temporary folder), which you then open and view. This has some advantages (such as quicker access to different parts of the file) but has the big disadvantage of having to wait for the whole file to download before any of it can be viewed. If the file is quite small this may not be too much of an inconvenience, but for large files and long presentations it can be very off-putting.
The easiest way to provide downloadable video files is to use a simple hyperlink to the file. A slightly more advanced method is to embed the file in a web page using special HTML code.Delivering video files this way is known as HTTP streaming or HTTP delivery. HTTP means Hyper Text Transfer Protocol, and is the same protocol used to deliver web pages. For this reason it is easy to set up
and use on almost any website, without requiring additional software or special hosting plans.
Streaming media works a bit differently — the end user can start watching the file almost as soon as it begins downloading. In effect, the file is sent to the user in a (more or less) constant stream, and the user
watches it as it arrives. The obvious advantage with this method is that no waiting is involved. Streaming media has additional advantages such as being able to broadcast live events (sometimes referred to as a webcast or netcast).True streaming video must be delivered from a specialized streaming server.
There is also a hybrid method known as progressive download. In this method the video clip is downloaded but begins playing as soon as a portion of the file has been received. This simulates true streaming, but doesn’t have all the advantages.
Which Method to Use?
The method you choose will depend on your situation, but most people will opt for HTTP streaming (download or progressive download). This is the easiest and cheapest way to get started. If necessary you can upgrade to a streaming server later.
Benefits of video streaming
Video streaming may soon become one of the most popular Internet technologies. For now the most commonly used video streaming technology is Video on Demand (VOD). It allows viewers to gain access to streaming video files using their web browser. However the potential ways of using video streaming include also such things as virtual classrooms and remote surgery.
Two-way video web conferencing is no longer the future, it is now. We can try it ourselves using newer instant messaging systems such as MSN Messenger. Of course, the quality of such video streaming is usually very low up to the point of being barely recognizable, but it can still be used to transfer live images over long distances.
Increasing the quality of two-way video conferences will call for the use of dedicated servers with low bandwidth overhead. They are extremely useful for maintaining business conferences.
For now, streaming video technology is reliable enough to let doctors remotely consult with each other and with patients, as well as give advice during the operation. This is a great benefit to all medical facilities located in sparsely populated areas. Consultations and contact with patients on the Internet save time and the expense of transporting the patient to an urban center for treatment.
The most popular application of video streaming is VOD. VOD video files can be hosted by any server and it is possible to access them by anyone with a computer and some kind of Internet connection.The easy access may be extremely useful for all kinds of users, but especially for schools and universities, giving teachers an opportunity to archive classroom material. The lectures can then be accessed at any time by any student. What’s more, they are easily supplemented with extra materials. Also, those universities which deal with distance learning rely mainly on video streaming technology.
Generally, VOD is a very handy tool for any large institution that needs to distribute learning materials. Unlike in case of university TV, lectures can be pauses, rewound and reviewed, making all learning process much more effective. That’s why sometimes educational videos are actually more effective than typical classroom instruction.Simply anything that can become a part of the footage can be kept on a web server and published on the Internet, including entertainment videos, business meetings, political speeches or ‘virtual tours’ which let the users see the layout of a particular building. Anther possible use is the security. Live video streaming can also help monitor remote locations. At first glance, this is similar to typical security cameras, except that streaming technology does not need closed circuits. The video can be monitored from virtually anywhere in the world, providing there is an Internet connection nearby.
How Does It Work?
Streaming media technology – video streaming – enables the real time, or on-demand distribution of audio, video and multimedia on the internet. Streaming media is the simultaneous transfer of digital media (video, voice and data) so that it is received as a continuous real-time stream. Streamed data is transmitted by a server application and received and displayed in real-time by client applications
such as the Microsoft’s Windows Media Player or the QuickTime Player. These applications can start displaying video or playing back audio as soon as enough data has been received and stored in the receiving station’s buffer. A streamed file is simultaneously downloaded and viewed, but leaves behind no physical file on the viewer’s computer.