Video can do a great deal to enhance a presentation, illustrate a proper technique, or advertise a new product. Video files are photographic images played at speeds that make it appear as if the images are in full motion. Video files are incredibly large because a huge number of images are required to give the appearance of motion. Depending on the screen size of the video file, a single second of uncompressed video running at 30 frames per second may require more than 30 MB of storage space. In addition to storage, bandwidth, the amount of data a communication channel can carry, is also an obstacle to the delivery of video. Delivering video over the Internet is particularly challenging. Despite these challenges, more and more multimedia applications, including multimedia applications disseminated via the Internet, include video. In order to be used effectively, however, video is often compressed, or reduced in size, for storage and transfer, and then decompressed for use. As computer resources continue to improve, the use of video in multimedia applications will also grow. Interactive multimedia allows users to respond directly to and control media elements. Users of interactive multimedia become active participants in an application instead of passive recipients of information. Linear media has a beginning and progresses through a set sequence of events until it reaches the end while non-linear media leaves the order of events to the discretion of the user. Multimedia applications are all around us. Our society depends on information and multimedia is an effective and user-friendly way to present it.
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