How to sync A/V?

Eugenia Loli-Queru

Eugenia Loli-Queru

Well-known member
Let's say that I want to shoot a music video clip for a friend of mine. We get a portable CD player and while I am shooting him, he lip-syncs with the portable player.

Then, I go to Vegas 7, and I import the video (without the audio captured from the camera) and then I import the same audio used in the CD player that the singer lipsynced. After I make some video edits, I have a few shots where the camera faces the singer, singing.

How can I sync these shots with the imported audio so it looks synced? Is there a specific Vegas trick or workflow recommended for music video clips that doesn't involve special hardware during shooting to do the A/V sync? I mean, how do I trim exactly the shots to fit before a shot that requires perfect sync comes along in the timeline, and how do I sync these shots in the first place?

Please give me some pointers in an elaborate manner, as I am new to Vegas. Thanks!
 
DO capture the audio from your video, and utilize the waveform between it and the music track. You should be able to match them up that way. Depending on how far away your microphone on set was from the CD player, the singer's lips MIGHT be off by a frame or two (but probably not) -- but then it's just a matter of adjusting the video left or right by that many frames.

There's a possibility that over the span of a song, a song played from CD on set and the MP3 of the song might lose sync with each other -- but that usually only happens over the span of a long song, if at all. In any case, when you're cutting the video, you're cutting between segments of what you've recorded, so you'll never be simply playing out the video you recorded in one long take. Individual segments should match.

You should be able to batch re-capture the video from the Media Pool (right-click on the pool), but before you do that, make sure you set Vidcap to capture the audio.
 
> Individual segments should match.

This sounds more difficult than simply placing the already-edited video to match the mp3. I mean, when you have many different takes, you always have to cut your video in a way that it fills up the whole mp3 song so there are no handicaps, and sync at the same time...
 
No, what you're doing is laying down the MP3 (or WAV or whatever you're using), then using the audio waveforms of your recorded video to match up visually with the waveforms of the MP3. It's pretty easy to do. If you do it while you're editing, it's much easier to synch than it would be to try to synch already-edited video with no audio.
 
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