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Chapter 4. Fine Tuning Using Trim Mode > Trimming One Side of an Edit

Trimming One Side of an Edit

There are a few points to be aware of when trimming one side of an edit point. Thinking of trimming in “time values” might help you understand a trim's outcome. In other words, at what chronological point in time did the event in the scene you have edited take place? A trim's outcome depends on the value of that trim (positive or negative) and which side of the edit you are working on. Think about this in relation to when an event took place. If you trim ahead on an outgoing clip, you see what happened at a later point in time. If you trim in the opposite direction, at your edit point you see what took place at an earlier point in time. This principle also works the same for the incoming side of an edit, so you don't have to think in positive and negative values. Here are a few points to explain what happens during a single-side trim:

  • The opposite side of the edit point should not change.

  • If you are extending the length of the outgoing clip, or trimming with a positive value (such as +4 frames), you add to the duration of that clip as well as to the overall duration of your sequence. This changes the last frame, displaying frames that occur later in the clip.

  • If you are shortening the length of the outgoing clip, or trimming with a negative value (such as –4 frames), you reduce the duration of that clip as well as to the overall duration of your sequence. This changes the last frame, displaying frames that occur earlier in the clip.

  • If you are changing the length of the incoming clip, or trimming with a positive value (such as +4 frames), you reduce the duration of that clip as well as the overall duration of your sequence.

  • If you are changing the length of the incoming clip, or trimming with a negative value (such as –4 frames), you add to the duration of that clip as well as the overall duration of your sequence.

tip

Trimming one side of an edit can effect audio and video synchronization if not all tracks are selected. See Chapter 8, “Audio Sweetening for Perfections,” for more details on working with synced tracks.


With that last point, notice the opposite effect going on here. Adding time to a clip (increasing its duration) does not always mean that you work with a positive trim value. You must pay attention to which side of the edit you are working on.

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