how to sync two video files at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.


Reply
 
Thread Tools Search this Thread
Old November 9th, 2008, 01:34 PM   #1
Major Player
 
Join Date: Aug 2005
Posts: 421
how to sync two video files

I have HDV footage that was shot using two cameras; is there any way to sync it in Vegas? I always have fraction of a second apart. Would using of some sort TBC help???
Marius Boruch is offline   Reply With Quote
Old November 9th, 2008, 04:24 PM   #2
Inner Circle
 
Join Date: Jun 2005
Location: Cincinnati, OH
Posts: 8,421
I use the audio to sync. Usually come out pretty darn close. Match your peaks on the lines of audio the best you can and then zoom in on the timeline and match it more precisely.

Have you already tried that Marius?
Jeff Harper is offline   Reply With Quote
Old November 9th, 2008, 05:19 PM   #3
Sponsor: JET DV
 
Join Date: Dec 2001
Location: Southern Illinois
Posts: 7,873
Same here. Look for a specific audio peak and line them up. Using the 1/3 keys on the numeric keypad helps this process. You can also listen to the audio with both playing and eliminate any "echo" to line them up.

If you have a camera flash, that can often be used as well. Just line up the "flash" on both cameras and you should be in sync.
__________________
Edward Troxel [SCVU]
JETDV Scripts/Excalibur/Newsletters
Edward Troxel is offline   Reply With Quote
Old November 9th, 2008, 10:55 PM   #4
Major Player
 
Join Date: Jun 2008
Location: Karachi, Pakistan
Posts: 210
Clap clap clap!

You could also buy a clapper and use that at your shoots :) it IS called a clapper right? Sync the audio spikes of the clapper's sound in each footage, this is particularly handy if you usually don't have or can't see any distinctive audio spikes.
__________________
Windows 7 Ultimate 64-bit // i7 2600K // 16GB RAM // ASUS P8P67 Board // NVIDIA GTX 470
Sony Vegas Pro 13 // Adobe Premiere Pro CC 2014 // http://vimeo.com/alijafri
Ali Jafri is offline   Reply With Quote
Old November 10th, 2008, 12:31 AM   #5
Inner Circle
 
Join Date: Feb 2007
Location: Apple Valley CA
Posts: 4,866
A trick I've seen here previously is to pan the two audio tracks far left and far right - use headphones and you should be able to sync the two tracks almost to perfection. I've used that a few times now when I just couldn't quite nail the sync... seems to work pretty well!
Dave Blackhurst is offline   Reply With Quote
Old November 12th, 2008, 03:59 PM   #6
Major Player
 
Join Date: Aug 2005
Posts: 421
Guys,
Thanks for your input; of course that's what I do I sync audio looking at it (although I heard that Vegas 8 should sync audio automaticly - or is in some extra plugin "Excalibur"???)
what I need, is to sync it VERY precisely almost ideally - it is always like small fraction of second apart. It is like Photoshop and working with leyers; you have to uncheck "snap to" option to freely move layers around to achieve almost "infinite" precision ; if you enlarge the timeline and work in single frames, Vegas behaves like tracks are always a notch shifted so I was hpoping that maybe there is some kind of setting that would free the tracks COMPLETELY.
I need this absolutr precision to produce 3D video (something like TBC).
Marius Boruch is offline   Reply With Quote
Old November 12th, 2008, 04:18 PM   #7
Inner Circle
 
Join Date: May 2005
Location: Windsor, ON Canada
Posts: 2,765
Marius, turn off Quantize to Frames, get everything properly synced up and then turn it back on again.
I've used this technique several times when I need to adjust one track finer than the lenght of a video frame.
Mike Kujbida is offline   Reply With Quote
Old November 22nd, 2008, 04:40 PM   #8
Major Player
 
Join Date: Aug 2005
Posts: 421
bingo;
thanks
Marius Boruch is offline   Reply With Quote
Old November 22nd, 2008, 09:47 PM   #9
Major Player
 
Join Date: Oct 2002
Location: Albuquerque, New Mexico USA
Posts: 326
Turning off quantize to frames is fine when you need to sync just audio, but it should never be turned off for video. Video must end up on frame boundaries.

Also, you can't really use audio to sync unless both cameras were fed from the same audio source. Remember that audio travels at about 1 foot per millisecond and that a frame in NTSC is 33ms. If you're using on-board microphones and one camera is 33 feet from the sound source and the other is 33 feet further still, then audio from the first camera will be one frame late with respect to the visuals and the second camera will be off two frames and the two cameras will be off a frame relative to each other. If you're doing 3D then you really must genlock the two cameras so they record in exact "lock step." The problem you are having is that both cameras didn't start at EXACTLY the same time and their frame offset doesn't match up. I've done a fair amount of 3D video for Los Alamos Labs and it simply does not work well unless the cameras are perfectly synced.
John Cline is offline   Reply With Quote
Old November 23rd, 2008, 09:16 AM   #10
Major Player
 
Join Date: Mar 2003
Location: Bemidji, MN
Posts: 276
NOTE: I just upgraded to 8.0c and haven't done any editing with it yet. This is what I was doing with 5.0.

Keeping the video locked to the audio tracks
do a close/rough sync
run one audio track to the right channel and the other to the left channel
playback and listen, adjust one track until your echo dissapates.

If you need a finer adjustment
zoom in on the track, you will be able to make micro-adjustments

I shoot with two cameras, so the difference in the video portion won't be noticable at all when making cuts. Only way to see a problem with the video is if you show both video tracks at the same time.

Also, use the flash method, or look for a spot where someone dropped a hymnal creating a spike. (always happens)
__________________
"DOH"!!!
Harry Settle is offline   Reply With Quote
Old November 23rd, 2008, 12:26 PM   #11
Sponsor: JET DV
 
Join Date: Dec 2001
Location: Southern Illinois
Posts: 7,873
For fine-tuning the placement of the audio, I prefer to have ONE of the audio tracks selected. Then using the 1 and 3 keys on the numeric keypad I can adjust the position one frame at a time left or right until I get it in sync. No need for zooming or anything else.

Personally, I just leave both in both ears and get rid of any "echo".
__________________
Edward Troxel [SCVU]
JETDV Scripts/Excalibur/Newsletters
Edward Troxel is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:54 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network