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changing ndf audio to df
We just shot a show with 5 cameras recording in drop frame and a separate audio recording mistakenly recorded in non drop frame. When playing the video and audio in the timeline together the audio slowly goes out of sync.
Does anyone know a work around to change the audio to drop frame?? I’ve searched the internet and found nothing on the subject. I’m thinking this should be an easy fix, as you really only need to change the timecode on the audio.
Any help would be greatly appreciated. Thanks!
-Andy C
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6 Replies
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DF or NDF has nothing to do with a loss of sync as neither has anything to do with frame rate. Once you establish sync bewteen two sources recorded at the same framerate, even if one is DF and the other NDF, they will play in sync.
You need to find out if the sound person possibly recorded the audio at 30fps instead of 29.97 or something like that.
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY ™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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Audio speed is determined by sample rate and clock pulse source.
What machine was the sound recorded on, and what were the settings?
Drop Frame and Non Drop Frame is a timecode numbering scheme, and timecode is an addressing system. On its own, timecode setting should not affect sound speed.
On some audio recorders certain timecode setting will alter the sample rate.
If the camera and sound were running continuously, there’s an easy way to sync them up.
Put the video into the timeline, mark a sync point near the beginning (a loud footstep or door slam works great) with an IN mark.
At the end of the clip in the timeline, mark another sync point (another loud quick sound) with an OUT mark.
Now take your audio clip and open it in the viewer. Find the same sync point you used for the video in the timeline, and mark IN, find the other sync point in the audio and mark OUT.
Now drag that audio from the viewer to the canvas and drop it on “Fit to Fill”. Now audio should be in sync, having been speed changed to fit properly through the “Fit to Fill” function.
Drag out the ends of the audio in the timeline, to get the complete audio, and you should be in sync.
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[Steven Gonzales] “Now audio should be in sync, having been speed changed to fit properly through the “Fit to Fill” function. “
Would this not result in a pitch change to the audio as well?
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Yes. Usually the change is 1/10th of 1 percent, so it would take very sensitive pitch sense to perceive it.
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Great, thanks for all your help guys!
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Hi,
Though the sync part of your problem was solved, and of course wasn’t related to the drop/non drop issue, I thought I would address how you can change your timecode from drop frame to non drop frame and vice versa. You have to do it one audio clip at a time, so it’s a pain, but in case you ever want to do it:
1. Select the audio clip the the browser.
2. Go to Modify > Timecode
3. Check “source” if you want to modify the actual media, or “auxilliary” if you want to add auxilliary timecode and leave the media untouched.
4. In the drop down menu, choose non drop or drop frame audio.You can also assign a reel name to your audio this way.
Nayeli
-Nayeli
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