PluralEyes 3/3.5: Touching-Up Synchronization Results

PluralEyes 3 has “touch-up synchronization” features to help move unsynchronized clips into place. These use audio comparison algorithms similar to the ones used in the automatic synchronization. When you indicate a possible partner (and optionally an approximate location) for a clip, the algorithms do the rest of the work of moving the clip to precisely the right location.

Synchronizing a Pair of Clips With Each Other

This is usually the easiest way to synchronize an unsynchronized clip.

  1.  Play through other tracks to find a reference clip that should synchronize with the unsynchronized clip, i.e. clips that were recorded at the same time as the unsynchronized clip.
  2. Click the unsynchronized clip, then Command-click the clip from the other track so that both are selected.
  3. Click Sync > Synchronize Pair of Clips.
  4. PluralEyes moves one or both of the clips so that they are in the best place relative to each other, and marks them as Synchronized.

If the above procedure does not result in the unsynchronized clip being correctly synchronized, you can try marking the clip as Unsynchronized and then repeating the procedure with a different reference clip. Try to choose a reference clip whose audio content is as similar as possible to that of the unsynchronized clip.


Synchronizing a Pair of Clips Using a Suggested Sync Point

If the Synchronize Pair of Clips feature does not work, you can manually move the unsynchronized clip into approximately the right location, and then invoke the Snap Clip to Optimal Location command to have the clip automatically moved to a more accurate location. The Snap Clip to Optimal Location command uses audio comparison to find the best location for a clip within a 5-second window.

This approach is more time-consuming than using the Synchronize Pair of Clips feature, however it works in more difficult cases.

  1. Click the 2-up button in the toolbar.

  2. Select the track containing the unsynchronized clip, and move the playhead to somewhere in that clip, so that the clip is displayed in the Viewer.

  3. Select another camera track to display it in the Viewer.

In the example shown below, the unsynchronized clip is in the Camera 2 track. The Camera 1 track is also displayed in the Viewer.

  1. Try to find a moment in the unsynchronized clip that is distinctive in some way. In the example above, the unsynchronized clip in Camera 2 has a distinctive moment in which the guitarist throws his head backwards.

  2. Tip: To move the playhead across a clip frame-by-frame, press Shift+Left Arrow or Shift+Right Arrow.

  3. Try to find the same distinctive moment in the footage from the other camera or audio recorder. Pause the playhead there. In the example below, the playhead has been paused at the moment in which the guitarist throws his head backwards, this time in the footage from Camera One.
  1. Drag the unsynchronized clip so that the distinctive moment is in view in both Viewer panes. In the example below, you can see that the guitarist is throwing his head backwards in both Viewer panes. 
  1. Click the unsynchronized clip, then Command-click the clip from the other camera so that both are selected.

  2. Click Sync > Snap Clip to Optimal Location. The unsynchronized clip will probably move slightly, if PluralEyes can find a better location for it within 2.5 seconds before or after its current location. 


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