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ADOBE PREMIERE 5.0
User Guide
When you use the Frames/Samples option, you gain flexibility in setting the audio source In
point only. The source clip’s In point specifies the first frame or audio sample played back from
the clip, not the program In point in the Timeline where the audio clip begins to play. When
you add the clip to the Timeline, the clip’s source In and Out points are translated into program
In and Out points, which can only exist at the timebase you specified. So although the clip can
start playing from any of its source frames or samples, the last frame or sample it plays will be
rounded to the nearest frame boundary in the Timeline—even if you specified the source
Out point at the frame or sample level. To use the Frames/Samples option for an audio clip,
see “Setting an audio source In point between timebase divisions” on page 151.
Comparing interlaced and non-interlaced video
Analog or digital video can be classified as interlaced or non-interlaced (progressive scan).
Video programs using the NTSC, PAL, and SECAM standards are
interlaced
: Each frame
consists of two fields displayed in two passes. Most personal computers display using
progressive scan
, in which all lines in a frame are displayed in one pass from top to bottom
before the next frame appears.
In interlaced video, a frame is divided into two
fields
. Each field contains every other
horizontal line in the frame. A TV displays the first field of alternating lines over the entire
screen, and then displays the second field to fill in the alternating gaps left by the first field.
One NTSC video frame, displayed approximately every 1/30th of a second, contains two
interlaced fields, displayed approximately every 1/60th of a second each. PAL and SECAM
video frames display at 1/25 of a second and contain two interlaced fields displayed 1/50th
of a second each. The field that contains the topmost scan line in the frame is called the
upper field
, and the other field is called the
lower field
. When playing back or exporting
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