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Chapter 13
Videonics MX-Pro User Guide
You can perform an A/A roll with an automatic editing system. Press
FREEZE
at the
end of one scene and wait for the editing system to start the next scene. While the
controller locates the next scene, set up the transition you want. When you see the
editor release the recorder from the pause state, press
PLAY
on the MXPro to run the
transition.
Limitations on A/A Roll
Transitions
Slide transitions, compresses, most zooms, and scaling effects automatically convert to
wipes. Other transitions might not produce the impact you want when the frozen pic-
ture is similar to the incoming video. Experiment with various transitions to determine
which ones produce the results you want.
A/B Roll Edits
A/B roll editing involves editing scenes from multiple sources. When doing A/B roll
edits, you must manually synchronize the sources so that they are timed correctly.
Normally, you record a countdown before each scene so you know when it starts, then
back-time the transition accordingly.
Example…
Scene 1 is playing on VCR A. You know it ends soon, so you start VCR B, and pause it at a
point 5 seconds before its action starts. When VCR A is 5 seconds from its end, you release
VCR B and let it roll. At this point, both VCR A and B are rolling. At the desired moment, you
perform the transition from VCR A to VCR B.
Another method of A/B roll editing involves the use of working copies. You copy the
original footage to new tapes, placing every other scene on a different tape. The result
might look similar to this:
Accurate placement of the scenes (1 through 5 in this example) allow both tapes to roll
simultaneously so you can transition between scenes without having to start and stop
each VCR at the correct moment in time. When you want to use a transition between
scenes, you should overlap them by a couple of seconds to ensure the proper effect.
The advantage to this method is that it makes it easy to get exactly what you want on
tape. It has two disadvantages, however — (1) it requires careful preparation and plan-
ning, and (2) it requires an extra “generation” in the tapes (that is, productions are a
copy of a copy rather than a copy of the original).
1
3
5
1
2
4
3
5
2
4
VTR
A
VTR
B
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