HDV audio Lag at DVinfo.net

Matthew Nayman · March 14th, 2007, 10:25 AM

So, it appears that audio drifint gout of synch on my XHA1 is fairly standard, and to be expected from HDV on long clips. My question is, "is there a work around?" I know programs like HDVsplit split up and re-synch M2T files, but that it still doesn't support canon's 24F. I need to able to capture 60minute clips and not have to resynch each tape everytime.

Ideas?

Chris Hurd · March 14th, 2007, 10:33 AM

Name your NLE please

Bill Pryor · March 14th, 2007, 11:13 AM

An audio sync problem is NOT to be expected from HDV and it is most definitely not standard.

If you're recording out of sync, that's a defect. Play back the tape in camera and watch it in the viewfinder or the LCD screen. If it's in sync, then there's no problem with the camera. The problem would be in your editing system.

I don't know if this relates to your issue, but just for fun I installed FCP on my 12" iBook, loaded some clips, and they played back out of sync. I moved the project files, along with the captured clips over to the G5, and everything was fine. So while my iBook will capture properly, it won't play back HD properly, which I pretty much expected. All of this was in 24p, capturing in the FCP HD1080P24 setup and editing in a 24P timeline.

Matthew Nayman · March 15th, 2007, 06:11 AM

Sorry guys,my NLE is adobe premiere pro 2.0

I have a 2.4 GHZ dual core processor, 3gb of ram, 2 Nvidia 7600 GTSA cards linked through SLI and 1 terabyte of space internal (2X500gb)

My comp is plenty fast for HD, but it seems otr capture out of synch. My camera plays it back perfectly in synch mind you, so it is a capture problem, not a camera problem.

My bussy Mike Wong (also on these boards) says he has alwaus had this problem with HDV.

Is it jsut a matter of my comp STILL not being fast enough? 2.4 dual core is as fast as the top G5's

Chris Hurd · March 15th, 2007, 06:19 AM

Moved from Canon XH to Attend the World Premiere. HDV audio sync issues are usually caused by inadequate NLE system resources, most commonly insufficient RAM.

Bill Pryor · March 15th, 2007, 09:17 AM

His 3 gigs of RAM ought to be enough. It's gotta be some other NLE issue, I think. It seems as if most people shooting HDV today are using FCP and some Avid Xpress Pro, and I don't know of any problems with either of those systems. My iBook obviously is way underpowered to play back HDV, but as I discovered, the stuff is actually captured in sync because when I moved everything to the G5, it played fine. A friend of mine just got one of the new bisexual Mac laptops, so we'll see soon how that does with HDV.

Michael Y Wong · April 1st, 2007, 01:00 PM

No worries about it anymore Matt,

http://www.dvinfo.net/conf/showthrea...light=hdvsplit

As for the problem, I noticed this happening later on occasion with LARGE files and would only happen within the NLE and not during normal playback, so I would assume it to be some sort of insufficient resource issue while runnign the NLE. I too use PP2.0 and was somewhat worried that in order to keep audio in sync I would have to manually use MPEG Womble and cut up the files, which would have sucked!

March 14th, 2007, 10:25 AM	#1
Matthew Nayman Major Player Join Date: Feb 2005 Location: Toronto Posts: 917	HDV audio Lag So, it appears that audio drifint gout of synch on my XHA1 is fairly standard, and to be expected from HDV on long clips. My question is, "is there a work around?" I know programs like HDVsplit split up and re-synch M2T files, but that it still doesn't support canon's 24F. I need to able to capture 60minute clips and not have to resynch each tape everytime. Ideas?

March 14th, 2007, 10:33 AM	#2
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Name your NLE please __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

March 15th, 2007, 06:19 AM	#5
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Moved from Canon XH to Attend the World Premiere. HDV audio sync issues are usually caused by inadequate NLE system resources, most commonly insufficient RAM. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

April 1st, 2007, 01:00 PM	#7
Michael Y Wong Major Player Join Date: Jun 2006 Location: Toronto Ontario Canada! Posts: 353	No worries about it anymore Matt, http://www.dvinfo.net/conf/showthrea...light=hdvsplit As for the problem, I noticed this happening later on occasion with LARGE files and would only happen within the NLE and not during normal playback, so I would assume it to be some sort of insufficient resource issue while runnign the NLE. I too use PP2.0 and was somewhat worried that in order to keep audio in sync I would have to manually use MPEG Womble and cut up the files, which would have sucked! __________________ dreaming hobbyist + storyteller www.michaelywong.com

March 14th, 2007, 11:13 AM	#3
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	An audio sync problem is NOT to be expected from HDV and it is most definitely not standard. If you're recording out of sync, that's a defect. Play back the tape in camera and watch it in the viewfinder or the LCD screen. If it's in sync, then there's no problem with the camera. The problem would be in your editing system. I don't know if this relates to your issue, but just for fun I installed FCP on my 12" iBook, loaded some clips, and they played back out of sync. I moved the project files, along with the captured clips over to the G5, and everything was fine. So while my iBook will capture properly, it won't play back HD properly, which I pretty much expected. All of this was in 24p, capturing in the FCP HD1080P24 setup and editing in a 24P timeline.

March 15th, 2007, 06:11 AM	#4
Matthew Nayman Major Player Join Date: Feb 2005 Location: Toronto Posts: 917	Sorry guys,my NLE is adobe premiere pro 2.0 I have a 2.4 GHZ dual core processor, 3gb of ram, 2 Nvidia 7600 GTSA cards linked through SLI and 1 terabyte of space internal (2X500gb) My comp is plenty fast for HD, but it seems otr capture out of synch. My camera plays it back perfectly in synch mind you, so it is a capture problem, not a camera problem. My bussy Mike Wong (also on these boards) says he has alwaus had this problem with HDV. Is it jsut a matter of my comp STILL not being fast enough? 2.4 dual core is as fast as the top G5's

March 15th, 2007, 09:17 AM	#6
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	His 3 gigs of RAM ought to be enough. It's gotta be some other NLE issue, I think. It seems as if most people shooting HDV today are using FCP and some Avid Xpress Pro, and I don't know of any problems with either of those systems. My iBook obviously is way underpowered to play back HDV, but as I discovered, the stuff is actually captured in sync because when I moved everything to the G5, it played fine. A friend of mine just got one of the new bisexual Mac laptops, so we'll see soon how that does with HDV.