In this tutorial you’ll learn how to synchronize interview audio and video within Final Cut Pro X.
How To Synchronize Interview Audio and Video in Final Cut Pro X
Usually when you record dual-system sound you end up with a situation like this:
- Many little video files: you have several, possibly many, video clips. These videos have the audio recorded from an on-camera shotgun mic or the camera’s built-in mics. The
levels are a low and so is the sound quality.
- One (or a few) big audio file: you have a lavalier or a boom mic that goes directly to an external recorder. This recording sounds a little bit better.
Even on a single shot, you might have two (or more) video clips if your camera has a clip limit. Some DSLRs have a 10-12 minute clip length limit (a 30 minute clip limit in Europe). Or maybe you stopped and started a recording during the interview just to help yourself organize. So it’s very common that you’ll end up with multiple video clips and one long external audio recording.
PluralEyes is a little single-purpose program that is really good at syncing audio. It’s especially good for complicated shoots where you have multiple cameras and audio sources. Maybe you’re recording a live performance with three or four cameras and a line from the sound board, and then everybody has their own microphones on top of their cameras. PluralEyes can synchronize between all that video and audio very quickly.
First I’m going to show you how to use PluralEyes. Then I’ll recommend a few ways to do this within Final Cut that makes it easier and simpler, without having to use PluralEyes.
How to Synchronize Audio and Video with PluralEyes
The first way we’re going to synchronize audio is to send the project from Final Cut to PluralEyes, and back again. This is called a “round trip” between the applications.
Round Tripping Between Final Cut and PluralEyes
1. Create the Timeline in Final Cut Pro
Select your video clips and place them on the timeline. Then place your audio on the timeline underneath the video. Choose File > Export XML and save the file.
2. Import to PluralEyes and Process
In PluralEyes, choose File > New Project from Final Cut Pro, and select the file you just saved. The timeline you created with Final Cut will load into PluralEyes. Go to Sync > Synchronize to start the process. For short videos with clear audio, it sometimes takes less than a second.
3. Export and Return to Final Cut Pro
Now export the corrected timeline back to Final Cut Pro: File > Export.
Select Final Cut Pro X XML, Create multicam clips, and Open Event/project automatically in Final Cut Pro. You can deselect Create an Event with audio content replaced in video clips.
We selected our media assets, processed them in PluralEyes. It’s a great start: you now have the video and audio synced within a multi-cam clip. PluralEyes also spits out a new project where your video and audio are synced. You’re ahead of the game!
How to Synchronize Audio and Video in Final Cut Pro
It doesn’t take much for PluralEyes to do this kind of work for interviews. However, going to another program can be overkill on smaller, simpler projects. It is also another expense, in addition to what you’ve already paid for your license to Final Cut. Luckily, you can sync audio and video in Final Cut without using PluralEyes.
The Easy Way
The first way to sync is simple: to select your video clips and your audio clip from your Library, then right-click, and choose Synchronize Clips. In the modal box that pops up, give the new clip a name, tick Use audio for synchronization, and click OK.
One thing to keep in mind with this method is that it retains the original on-camera audio. If you go to your Inspector and select this new synchronized interview clip, you’ll see that Final Cut keeps our old audio from on top of the camera, in addition to the good audio from the external recorder. So you’ll want to uncheck it to make sure that we don’t hear the bad audio anymore.
The Multicam Clip Way
The second way that we can synchronize interview audio and video within Final Cut is to create a new multicam clip. Final Cut will actually synchronize the video and audio within the multi-cam clip automatically.
As before, select your audio and video files. Right-click, and select New multicam clip. Call this something like “synchronized interview multi-cam clip,” and make sure that Use audio for synchronization is selected. Leave everything else in its default settings.
Now if you go to the resulting multi-cam clip you’ll see that in Angle 1 you have your original two video clips, and then your one long external audio clip, and they’re synced perfectly.
The Manual Way
Those are the two automated methods of using Final Cut to sync interviews, and they work 90 percent of the time. When they don’t it can be really frustrating. You can end up spending a lot of time trying to force the automation to work when it would be really much easier to just do it manually.
Locate the audio and video clips to sync. Right-click your first video clip and select Open in Timeline. The video and audio within the clip from the clip have been added to the timeline as separate elements.
Now drag the external audio track below them. Try to move this audio track as close to what looks like a sync visually; you’ll manually fine tune the sync frame by frame, left and right.
So visually we can move this back. You can see that this is the hand clap sync. You’ll notice there are other peaks here that look pretty similar to each other, so we can visually just kind of find that peak. And get it as close to where we think it’s synced – you don’t have to get it super close, but close enough.
Start playing the playhead (L), and use your comma (,) and period (.) keys to nudge the external audio clip left a frame or right a frame until it’s in sync. You’ll know it’s in sync when the audio sounds like it has a phase effect on it: it sounds like it’s a little tinny or like a space alien. You’ll know it when you hear it (like we do in the video above).
Now that you have everything in sync, don’t delete the original audio. You may need to reference it, and in any case, you don’t want to delete data in editing anyway. But you can hide it by using your V key. If you go back and drag this clip into your project you will have the good audio married to the video now.
Sync Multiple Clips Manually
If you have multiple video clips, one really easy way to manually sync them step by step is to go back into Open in Timeline.
When you reach the end of the video clip, just Blade (B) the leftover segment of the interview from the audio recorder. Cut and delete the gap, and then go into the second clip. Open that in the timeline, and now you can paste and start to move this audio closer to where the peaks are in sync.
And now you are all set: your original video clips now have the good audio synced to them. In all of the methods here you didn’t generate any new clips, which is really great for organization. Anywhere that these clips go now, the synced audio will follow them.
I hope you’ve learned how to synchronize interview audio in Final Cut Pro X. See you next time!