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Setting frame rate


    The composition frame rate determines the number of frames displayed per second. Frame rate is usually determined by the type of output you produce. NTSC video has a frame rate of 29.97 frames per second (fps), PAL video has a frame rate of 25 fps, and motion picture film has a frame rate of 24 fps. Video intended for CD-ROM or the World Wide Web is often 10 to 15 fps.

    Each motion-footage item in a composition can also have a frame rate, and the relationship between the footage-item frame rate and the composition frame rate determines how smoothly the layer plays. For example, if the footage-item frame rate is 30 fps and the composition frame rate is 30 fps, whenever the layer advances one frame, the next composition frame is displayed. If the footage-item frame rate is 15 fps and the composition frame rate is 30 fps, then two composition frames are displayed before the current layer advances one frame, unless frame blending is enabled. (See Using frame blending.)

    When you use footage that was shot or rendered at the NTSC-standard rate of 29.97 fps and the composition frame rate is 30 fps, approximately two footage frames will be repeated every minute to compensate for the differing rates. To avoid repeated frames, make sure that your composition frame rate matches your source footage, or enable frame blending for the layers.