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Audio/Video Synchronization
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Is there any "easy" way to take the audio from one video and match up, time wise, with another video?

I shot a scene with two cameras. One camera has perfect sound, but the video setup is not what I want. With the other camera, the video is perfect, but the sound is terrible.

I know I can split the audio and video, but the hard part is trying to get the audio to match with the other video. I would like to get the person's lips moving with what is being said. Is this just a thing that I will have to spend time on trying to get them as close as possible? Or, is there a way to line them up exactly?

Thanks,
Sean -
Carl312
Senior Contributor Location: Texas, USA Joined: Mar 16, 2010 20:11 Messages: 9090 Offline
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There is not an easy way to do it with two cameras.

If you had recorded a clapperboard, you could sync the sound to the clapperboard closing.

http://en.wikipedia.org/wiki/Clapperboard

If you can find the exact spot where the video is perfectly synced for the two cameras, then you may have an easier method of syncing the audio from one camera with the video from the other camera.

I would suggest that a way for finding the nearest point of the two video being in sync is to place one camera on PIP track 1 and the other camera on PIP track 2 (PD has 9 pip tracks). You may or may not need something (color board) on the main video track.

In PIP designer, slide the two videos side by side, you can then see the action and can slide one of the pip tracks right or left to get the video in sync.

Once the video is in sync you can then split both videos at the same point then you can extract the audio of the good sound and be in sync.

The other method is to extract the audio from the good sounding video, then slide the audio track until the video and sound is in sync.

Both methods require a lot of work.

You can expand the timeline to the max of one frame and then the audio can be synced to within one frame, 33 milliseconds for NTSC, 40 milliseconds for PAL.

This message was edited 1 time. Last update was at Oct 22. 2010 10:04

Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.

Keith Widdup [Avatar]
Newbie Joined: Nov 17, 2009 10:14 Messages: 40 Offline
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Carl's correct. I've just completed a video that required two cameras. Not easy without a clapper board, but it can be done.
Put the visuals with the best sound on the timeline, put the 2nd cam on PiP track and expand, find a point of synchronisation s near as possible, then play both tracks together. If they're out of synch you'll get an echo, so move the Pip track until the sound comes across as one.

Hope that makes sense.

Keith
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I'm afraid to say it because it only scares me for the future, but I actually timed the two perfect. I'll try and explain what I did, but it might be confusing because of all the different steps I went threw and I’m not sure if it was all needed.

I put one of video in PiP track1 and the other in PiP track2. I timed them correctly and the video/audios matched. The only problem there was that the video/audios could not be separated. So, I muted the audio of the video I was going to use and put the PiP track of the audio file that I was going to use behind the video track, so it couldn't be seen. Now, before I go on, would it have made a difference, file size, if both PiP tracks were in the file when I saved it for the internet (YouTube)? I just want to make sure because what I did next was a pain and took a LONG time, but it worked out.

I saved the file with them together for backup, cut one of the PiP’s out and made a .wmv of the one video left. I then did the same with the second. I had two separate files that were timed correctly. I then opened a new file and put both of the videos in the Master Video Track and separated the audio/video’s, moved the audio I wanted under the video I wanted and erased the other audio & video.

I was then looking at the video in the Master Video Track and the audio in the XXXX, but I couldn’t find a way to combine the two. Would this be necessary to control the file size? Anyway, I saved that file as a .wmv. I then made a new file and loaded that .wmv into the Master Video Track and the audio and video were combined.

BINGO!

I might have done some stupid things to get this done, but hey, it worked.

Now, my main question is, I went threw all of these procedures, but was all of it necessary? I was just trying to make sure that it the file would be as small as I could get it. I’m used to graphic design and for the web, all files need to be flattened and not with layers, plus with a low pixel count. Are these video files the same?

Thanks,
Sean -
Keith Widdup [Avatar]
Newbie Joined: Nov 17, 2009 10:14 Messages: 40 Offline
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You've lost me now...!
vn800rider
Senior Contributor Location: Darwen, UK Joined: May 15, 2008 04:32 Messages: 1949 Offline
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Working with 2 (or more) cameras is often a bit fraught. Not all cameras can be relied upon to give the same (nominal) output ie 30 fps etc etc so sometimes on a long piece the 2 shots inherently run out.

Assuming you have 2 pieces that are OK, you have two options. You need to use different parts of 2 videos whilst maintaining synch, or, as I understand your case, one video is OK for video, the other for audio

As Carl said, the "simplest" way is to extract the good audio, mute the good video and then line them up manually, using the main or PiP tracks, to get synch. From my experience this is trial and error unless you have a good "starting point" ie a clapper board or whatever. You will definitley need to operate at frame (or near frame) level to get this right. Then just produce to whatever file format is required.

It's more complex if you need to use parts of both video streams and maintain synch but the principle is the same but using PiP tracks to hide/show the sections required.

I haven't done any file size comparisons so can't advise. If you are concerned, you could use the extract audio function to produce a .wav file of the good audio and then synch the good muted video with it - in effect much the same as a "single" composite audio/video so presumably the file size won't be any different to a single camera shot?

Cheers
Adrian Life is really simple, but we insist on making it complicated. (see below)
Confucius
AMD Phenom IIX6 1055T, win10, 5 internal drives, 7 usb drives, struggling power supply.
Carl312
Senior Contributor Location: Texas, USA Joined: Mar 16, 2010 20:11 Messages: 9090 Offline
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The good video should be in the higher numbered PIP track, because that track will be on TOP of all the other video. Provided that you expand that PIP track to fill the screen.

Audio of the unwanted audio tracks must be muted. That applies to combined Video and Audio also.

Once the Video and Audio are in sync, then a produce to WMV should be the end result.

Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.

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