How to slow down audio by 0.01% for 5D Sync? at DVinfo.net

Sean Seah · June 22nd, 2009, 09:33 AM

I saw the Zacuto tutorial on how to slow down the audio to 99.9% to sync external audio from the H4n to the 5D2. Is that possible with Vegas?

Edward Troxel · June 22nd, 2009, 10:31 AM

Hold down the CTRL key and resize the audio to the proper length.

Yang Wen · June 22nd, 2009, 10:47 AM

Ed: How do you control a 0.1% length reduction via ctrl+mouse?

Edward Troxel · June 22nd, 2009, 11:06 AM

My assumption was that the length would also appear "short" and the video would be a longer event and you'd basically match them up. I was also guessing that it might not be exactly .01%.

However, for another option, there's also a "Time Stretch" effect. But I'd just hold down the CTRL key and adjust. Test it out, if it's still off, hold down the CTRL key and adjust again until it's right.

Mike Kujbida · June 22nd, 2009, 11:08 AM

I agree with Edward.
I've used the Ctrl+drag feature numerous times and it's a great tool !!

Stan Harkleroad · June 22nd, 2009, 02:58 PM

With both audio track lined up at the start go to the end of the track and zoom in and you should be able to see how much the drift is. Hold your mouse cursor over th end of your new track and hold down the CTRL key. You'll see the "~" symbol appear. Move your mouse left or right until it lines up with the original track and they will now be in sync.

I use a trick I came up with where I find an event at the end of the recording and create a loop region in the area where the new audio track drifts from teh original. Then I drag the loop region to the end of teh new track and I know exactly how much it needs to be altered. This way I'm not just guessing. I usualy zoom in and out multiple times to find and exact spot and it works like a charm.

Chris Barcellos · June 22nd, 2009, 03:42 PM

If you use NeoScene or other Cineform tools, it is conformed automatically. Original 5D conversions in Cineforms resulted in dead track at the end, based on length of capture. I would have to do the same drag to lengthen track. Worked fine.

Sean Seah · June 23rd, 2009, 03:50 AM

Yes I use Neoscene to get the avi for editing within Vegas. I had the impression that I will need to sync the audio from the H4n if I drag it onto the timeline directly.

Reason is I record a whole chunk from the H4n and match it to several clips in post. This is very tedious for event use.

Chris, so you mean that I do not need to do it since I use Neoscene? Therefore only FCP users who drag the files in directly or convert to Prores will need it?

Yang Wen · June 23rd, 2009, 07:22 AM

Ahh! I didn't realize the audio track would appear as a shorter segment than the video track.. Then yes, the ctrl+drag will work perfectly if you have snapping enabled. I use NeoScene so I guess I'm a bit oblivious to this..

June 22nd, 2009, 09:33 AM	#1
Sean Seah Trustee Join Date: Sep 2005 Location: Singapore Posts: 1,498	How to slow down audio by 0.01% for 5D Sync? I saw the Zacuto tutorial on how to slow down the audio to 99.9% to sync external audio from the H4n to the 5D2. Is that possible with Vegas?

June 22nd, 2009, 10:31 AM	#2
Edward Troxel Sponsor: JET DV Join Date: Dec 2001 Location: Southern Illinois Posts: 7,953	Hold down the CTRL key and resize the audio to the proper length. __________________ Edward Troxel [SCVU] JETDV Scripts/Scripting Tutorials/Excalibur/Montage Magic/Newsletters

June 22nd, 2009, 11:06 AM	#4
Edward Troxel Sponsor: JET DV Join Date: Dec 2001 Location: Southern Illinois Posts: 7,953	My assumption was that the length would also appear "short" and the video would be a longer event and you'd basically match them up. I was also guessing that it might not be exactly .01%. However, for another option, there's also a "Time Stretch" effect. But I'd just hold down the CTRL key and adjust. Test it out, if it's still off, hold down the CTRL key and adjust again until it's right. __________________ Edward Troxel [SCVU] JETDV Scripts/Scripting Tutorials/Excalibur/Montage Magic/Newsletters

June 22nd, 2009, 03:42 PM	#7
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	If you use NeoScene or other Cineform tools, it is conformed automatically. Original 5D conversions in Cineforms resulted in dead track at the end, based on length of capture. I would have to do the same drag to lengthen track. Worked fine. __________________ Chris J. Barcellos

June 22nd, 2009, 10:47 AM	#3
Yang Wen Major Player Join Date: May 2003 Location: Chicago, IL Posts: 991	Ed: How do you control a 0.1% length reduction via ctrl+mouse?

June 22nd, 2009, 11:08 AM	#5
Mike Kujbida Inner Circle Join Date: May 2005 Location: Windsor, ON Canada Posts: 2,770	I agree with Edward. I've used the Ctrl+drag feature numerous times and it's a great tool !!

June 22nd, 2009, 02:58 PM	#6
Stan Harkleroad Regular Crew Join Date: Jan 2009 Location: Gautier, MS Posts: 175	With both audio track lined up at the start go to the end of the track and zoom in and you should be able to see how much the drift is. Hold your mouse cursor over th end of your new track and hold down the CTRL key. You'll see the "~" symbol appear. Move your mouse left or right until it lines up with the original track and they will now be in sync. I use a trick I came up with where I find an event at the end of the recording and create a loop region in the area where the new audio track drifts from teh original. Then I drag the loop region to the end of teh new track and I know exactly how much it needs to be altered. This way I'm not just guessing. I usualy zoom in and out multiple times to find and exact spot and it works like a charm.

June 23rd, 2009, 03:50 AM	#8
Sean Seah Trustee Join Date: Sep 2005 Location: Singapore Posts: 1,498	Yes I use Neoscene to get the avi for editing within Vegas. I had the impression that I will need to sync the audio from the H4n if I drag it onto the timeline directly. Reason is I record a whole chunk from the H4n and match it to several clips in post. This is very tedious for event use. Chris, so you mean that I do not need to do it since I use Neoscene? Therefore only FCP users who drag the files in directly or convert to Prores will need it?

June 23rd, 2009, 07:22 AM	#9
Yang Wen Major Player Join Date: May 2003 Location: Chicago, IL Posts: 991	Ahh! I didn't realize the audio track would appear as a shorter segment than the video track.. Then yes, the ctrl+drag will work perfectly if you have snapping enabled. I use NeoScene so I guess I'm a bit oblivious to this..