How to web cams and video conferencing? Part V
To send and receive video is needed:
Video capture card that supports Microsoft Video for Windows.
Video Camera to Connect to the video capture card.
A third option, which replaces the two previously mentioned, is to have a QuickCam, which connects to the parallel port or the keyboard and does not need a video card.
To send and receive audio is also needed:
Sound card that is in accordance with the specifications of Windows Multimedia (Sound Blaster or above) that handles audio, preferably in Full Duplex mode.
A microphone and speakers or headphones.
Versions of Windows:
All versions of Windows
Windows for Workgroups 3.11
Not known for videoconferencing package that runs under OS / 2 or DOS.
5.4 Process of videoconferencing over the Internet
By having all the requirements outlined above, if a user runs a video packet, it may be carried out easily and quickly.
After installing any package if you need to configure some features. By this we mean that the user must specify certain parameters to the program, such as the type of camera and video and sound cards to be used in video conferencing, and management. Furthermore, some applications require the user's name, to show the other side of the videoconference.
Generally, you must set the agenda for the IP address of the computer that is on the other side of the connection, this connection is made via the Internet if the IP address is incorrect or could not be located, the program will present the video an explanatory message to the user connection, indicating that the connection could not be established.
As seen, the Internet is essential for video conferencing using these packages, because being a network, to which everyone has access, is the ideal means to establish communication between any points in the world, and make meetings.
With the advance of technology has made it possible to transport video and sound from one point to another, via the Internet. Packages that use this means of transport, used small video cameras that are connected to a capture card images on the computer, capture the image and voice of those who are opposed to it, makes them carry digital signals and use this information the network until it reaches the destination where they could be seen and heard by those who are there.
2. Operation of the Web Cams
Specifically, the video camera connected to the computer captures the image (s) of person (s) is (n) against it. Also, through a microphone and with a sound card, all audio is trapped. Thus, information to be captured by the devices connected to the computer, are encapsulated and sent to the network, where, through the Internet connection, the package uses the principles of TCP / IP to enable data to reach their final destination, or the person whose IP address was entered at the beginning of the videoconference.
And thanks to this also provides the means to ensure the safe arrival of information to its correct destination, because each program has special methods to detect loss of data packets sent either video or audio, and performs its own operations or apply algorithms that let you save video and ensure that data loss go unnoticed for the user.
In some of these packages for video conferencing over the Internet, any video capture is done via Microsoft Video for Windows Video Capture API. This allows them to capture video from any video card that supports Windows.
Each package has its own method of transmission of both video and audio, some such as Video Phone, using techniques that minimize the amount of information to convey, leading to a faster transmission and safer. Whatever the method used for each packet, all offer excellent quality sound and images, enabling videoconferences were performed successfully in most cases.
One advantage of using these packages and the current transmission medium of the Internet, which decreases discomfort and prevent other problems that caused the previous video. A few years earlier, required the installation of video conferencing rooms specially equipped and dedicated transmission links.
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