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 Under construction Fast-start streaming: Term used in Apple’s QuickTime architecture for progressive download. Fields: The sets of upper (odd) and lower (even) lines drawn by the electron gun when illuminating the phosphors on the inside of a standard television screen, thereby resulting in displaying an interlaced image. In the NTSC standard, one complete vertical scan of the picture or field contains 262.5 lines. Two fields make up a complete television frame the lines of field 1 are vertically interlaced with field 2 for 525 lines of resolution. FireWire: The Apple Computer trade name for IEEE 1394. Flash: Macromedia Flash is a popular architecture for vector-based Web animation. Often referred to as “streaming,” Flash does not fit the definition of “true streaming” used in this Primer. While Flash shares some characteristics with streaming media, and can simulate video by animating sequential frames, it does not deliver standard, full-motion video file formats over the Web and is constrained to files containing no more than 16,000 frames (approximately 17 minutes of material at 15 fps). The Flash file format, SWF, can be created using Adobe After Effects and Adobe GoLive software, as well as other applications. FPS: Number of “frames per second;” a method for describing frame rate. Frame: A single still image in a sequence of images which, when displayed in rapid succession, creates the illusion of motion the more frames per second (FPS), the smoother the motion appears. Frame rate: The number of images (video frames) shown within a specified time period; often represented as FPS (frames per second). A complete NTSC TV picture consisting of two fields, a total scanning of all 525 lines of the raster area, occurs every 1/30 of a second. In countries where PAL and SECAM are the video standard, a frame consists of 625 lines at 25 frames/sec. FTP: File Transfer Protocol is the simplest way to exchange files between computers on the Internet. Like the Hypertext Transfer Protocol (HTTP), which transfers displayable Web pages and related files, and the Simple Mail Transfer Protocol (SMTP), which transfers e-mail, FTP uses the Internet’s TCP/IP protocols. FTP is commonly used to transfer Web page files from the on which they were created to a Web server. Glossaire (PDF : 168 ko) |
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