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Working with Video
A single video frame normally consists of two interlaced fields called the odd and even fields. Aura lets
you work independently with either field, preserving
valuable detail that is usually lost if the fields are
merged into a single image.
If you work with video, you should understand the
Field and Aspect Ratio settings. The Field setting
determines whether the Even field or the Odd field
comes first. (If you are not working with video fields,
set this parameter to None.) You also want to set
Start to Time Code. The even field is indicated on
the global timeline by a .0 appended to the time
code. The odd field uses .1. (e.g., 00:00:00:15.0,
00:00:00:15.1, 00:00:00:16.0, etc.)
Standard display
When you select Even or Odd, Aura displays an
even and an odd field for each frame along its timeline. If you choose Even, Aura creates the field of
even-numbered lines first (0, 2, 4, etc.) then it creates
the odd field (lines 1, 3, 5, etc.), for each frame. If you
use Odd First, Aura reverses the order in which fields
are created.
NOTE The field setting affects the order of the
fields when imagery is exported for use in a
video project. If you find exported sequences
flicker badly on your VT[3] video output, it’s
very likely the field order setting you are using in Aura
is incorrect.
Video projects are usually fielded when the project
calls for the addition of animated brushes. This
makes for smoother motions, and reduced flicker.
Otherwise, even when your project involves video but
does not require the addition of animated objects,
you may be able to save considerable time and system resources by not working in a fielded project
mode.
NOTE VideoToaster 2.0 uses Odd field first
for NTSC, while it uses Even first for PAL.
Video also does not use square pixels like most
computers do. Generally, video pixels are vertically
elongated. Therefore, a video image looks squashed
when you view it on your (square-pixel) PC monitor.
The Aspect Ratio settings let you view a video image
correctly on your PC monitor. The value is the height
to the width ratio of a pixel. An Aspect Ratio of 1.0
indicates square pixels. A ratio of 1.1 indicates the
pixel is 110 percent of the width (i.e., vertically elongated or tall).
Aspect Ratio display option active
NOTE The Aspect Ratio setting affects
only the display of your project and does not
impact underlying data. It is not possible to
actually modify the true aspect ratio of
imagery using this setting.
EXITING AURA
Select Quit from the File menu to exit from Aura.
A confirmation panel appears. Activate Save this
configuration? to save/update the current user configuration. This configuration will be used when you
The Quit Panel for exiting Aura
next start the program. Deactivate this option if you
do not want to save/update the configuration. If you
1.7 Aura VT