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Trimming Types

When you trim, you can add or remove frames from a transition point in one of three ways:

  • A-side single-roller trim
  • B-side single-roller trim
  • Dual-roller trim

A-Side Single-Roller Trim

A-side single-roller trim isolates the A-side of the transition and either adds or subtracts frames at the transition point.

When you shorten the edit on the A-side:

  • The edit point moves earlier.
  • Frames are removed from the tail of the shot.
  • The sequence is shortened.

When you extend the edit on the A-side:

B-Side Single-Roller Trim

B-side single-roller trim isolates the B-side of the transition and adds or removes frames at the transition point.

When you shorten the edit on the B-side:

  • The edits downstream move earlier. The transition is not affected.
  • Frames are removed from the head of the shot.
  • The sequence is shortened.

When you extend the edit on the B-side:

  • The edits downstream move later. The transition is not affected.
  • Frames are added to the head of the shot.
  • The sequence is lengthened.

Dual-Roller Trim

Dual-roller trim affects both the A- and the B-sides of the transition simultaneously by adding frames to one shot while removing the same number of frames from the adjacent shot. Because both sides of the transition are affected equally, sync is maintained throughout the sequence.

When you perform a dual-roller trim:

  • When you trim earlier, the trim removes frames from the tail, adds frames to the head, and moves the transition earlier. The sequence length does not change.
  • When you trim later, the trim adds frames to the tail and removes frames from the head, and the transition moves later. The sequence length does not change.
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