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Appendix C: Glossary 417
FireWire: Apple Computer’s trademarked name for the
IEEE-1394
serial data protocol.
Field: A frame of interlaced video consists of horizontal lines and is
divided into two fields. The odd lines in the frame are Field 1; the even-
numbered lines are Field 2.
Frame rate: The frame rate defines how many frames of a video
sequence are played in one second. The frame rate for NTSC video is
30 frames per second. The frame rate for PAL video is 25 frames per
second.
Frame size: The maximum size for displaying image data in a video or
animation sequence. If an image intended for the sequence is larger
than the frame size, it must be cropped or scaled to fit.
Frequency: The number of repetitions in a periodic process (like a
sound wave or an alternating voltage) per unit of time. Usually
measured in repetitions per second, or Hertz (Hz).
GOP: In MPEG compression the data stream is first divided into
“Groups Of Pictures” – sections of several frames each. Each GOP
contains three types of frames: I-Frames, P-Frames (pictures) and B-
Frames.
GOP size: The GOP size defines, how many I-Frames, B-Frames and P-
Frames are included in one GOP. For example, current GOP sizes are 9
or 12.
Hardware codec: Compression method that uses special hardware to
create and play back compressed digital video sequences. A hardware
codec may offer better encoding speed and image quality than a codec
implemented completely in software. See
Codec
,
Software codec
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