Video Phones

The decision to pay the extra fees and move from online to broadband usually involves meeting three wants: faster downloads, faster uploads and live streaming video.

Transmission of live video streaming depends on bandwidth, video codec and the ability to send as many frames per second possible. See how these variables effect video on dialup and broadband.

First of all a bit 'of history on bandwidths and speeds. Manypeople use the bandwidth and speed of the terms as synonyms, so it is important to explain the difference. Think of a water pipe. You can not have more water through the pipe by increasing the pressure for sending it through faster. This increases the speed. "You will also get more water from the end to increase the size of the pipe. This increases the bandwidth" "

When moving from a dial-up ISP to a provider of broadband services, increasing the size of the pipe, increasing the bandwidth. ItIn order to provide additional information through the tube at the same time, allowing upload and download faster. Video data is also, but good video requires enormous amounts of data. For this reason, the video is often referred to as a hog bandwidth. If you have a wider bandwidth, which can get more video of the same amount of time.

The developers can be creative and complicated mathematical formulas called algorithms used for data packetsallow more packets to pass through the tube. This compares with an increase in the rate of water in the yard. In a world of algorithm called a video codec.'s Most famous codecs include MPEG-4, MPEG-2 and JPEG.

In order to evaluate the codecs, a definition of quality is crucial. The number of frames per second (fps) is usually objectively measuring video quality. "Video broadcast quality" is a common word, which means that usually 25-35fps. Independent of theoretical rates of most of the live video streaming over the Internet via broadband in the range of 10 to 15 fps. It's not like HDTV or like movies in the theater, but it is sufficient for the purpose.

JPEG send the video as a movie. Each full frame image from the film "Journey" is received and displayed. When the individual images, called frames, are accumulated together rapidly, seem to show movement, like a moviestripping.

MPEG-2, MPEG-4 and the others did not send an entire frame each time no. Send an I-frame, which is a complete list of which only once in a while. Between I-frames, which have only the video data to present the changes. So, if the image is of a fixed camera in a room where a person runs, not walls change, not as the image of the wall is not sent with every frame. Only places where the person moves transferred between I-frames. This is a greatdata without compromising the quality of the video. Yes, the same amount of data, the end result being more fps. This is why MPEG-2 and MPEG-4 is said to offer higher quality video.

What is the bandwidth? Bandwidth is the amount of data in a second, typically measured in kilobits per second (kbps sent). Have you ever noticed how TV reporters on satellite phones sometimes look weird? They are usually sent to a very low bandwidthless than 5 fps. You can see yourself asking why the plans call mobile they can usually only be video images or video clips to convey is that the slow motion is not clear? This is because the maximum bandwidth is 9.6 kbps, is considered very low.

Mobile data plans and dial-up telephone service fall in less than 56 kbps range. The service is about 56 kbps. Cable companies typically offer in 128 kbps or 256 kbps steps. But itmaximum prices. For example, phone calls, usually between 30 and 45 kbps in the real world, though it is theoretically 56 kbps.

MPEG-4 and its many variants are pretty much the standard for sending video over broadband. Several companies have developed their own unique touch to try to take into account variations in bandwidth, resulting in interruptions, pixilation and tears video. But, with a 256 kbit / s of bandwidth video streamaverage of 10-15 fps, maybe even top 20 or 25 fps depending on the fluctuations. Unfortunately, the dial-up number of frames per second that these standard codecs is less than 5 frames per second, can do, and often only 1 frame per second.

A couple of new video codecs, so that the frame rate 12 fps in dial-up service, in many respects similar to that offered broadband video. He developed the ability to transmit quality video throughDial.

To summarize the water pipe analogy, different video codecs increase the flow of water through an increase in the number of frames per second at the end of the pipe without increasing the size of the pipe. The transition from dial-up to broadband is a way to expand the size of the pipe so that more frames per second, may be the end of the tube.

The cost is always a consideration, with a dial-up is more convenient. Moreover, many people around the world have no access tobroadband, dial-up is their only option.

Comet Video Technologies develops products and services to low-bandwidth transmission of video through satellites, cell voice plans, data plans cell phone and remote access to broadband. http://www.cometvt.com

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