Audio issue with PPro2.0 and HDV capture at DVinfo.net

Charlie Durand · May 8th, 2007, 01:26 PM

Hey there,

I am posting yet again in regards to my issues with editing HDV footage in Premiere 2.0

I know where the problem is, I just don't know how to fix it.

I had posted in the past about the audio getting out of synch with the video when I edit HDV footage. At first I thought it was cheap tapes, so I bought some Panasonic AMQ's.

Still happened. If I play the RAW captured footage in another app the audio and video are fully in synch. When I go to edit it in Premiere sometimes they get out of synch.

I think it has something to with the process Premiere uses after you've capture the footage. First it indexes the MPEG file, then it runs another process on it. I think something goes wrong during the index stage. I've tried deleting the indexes and letting Premiete create new index files, same results.

Anyone else seeing this problem and (crossing fingers) know how to fix it?

It's annoying to have to re-synch my audio with the video this often. I'd say it happen about once every 3 tapes these days. Like I said, it's not a drop out because if I play the captured footage on another app the audio it just fine.

Thanks in advance.

Charlie Durand
San Jose, CA

Johan Bunis · May 10th, 2007, 06:52 PM

I have exact the same problem, but sorry dont have a answer. But good to see other have the same problem so I/we can appoint its a bug in premiere(?)

What camera do you use, I have a Canon HV20..

edit: Can it be the soundcard, I use my integrate SoundMAX on my Asus P5B Deluxe board.. What board do you have?

Quote:

Originally Posted by Charlie Durand

Hey there,

I am posting yet again in regards to my issues with editing HDV footage in Premiere 2.0

I know where the problem is, I just don't know how to fix it.

I had posted in the past about the audio getting out of synch with the video when I edit HDV footage. At first I thought it was cheap tapes, so I bought some Panasonic AMQ's.

Still happened. If I play the RAW captured footage in another app the audio and video are fully in synch. When I go to edit it in Premiere sometimes they get out of synch.

I think it has something to with the process Premiere uses after you've capture the footage. First it indexes the MPEG file, then it runs another process on it. I think something goes wrong during the index stage. I've tried deleting the indexes and letting Premiete create new index files, same results.

Anyone else seeing this problem and (crossing fingers) know how to fix it?

It's annoying to have to re-synch my audio with the video this often. I'd say it happen about once every 3 tapes these days. Like I said, it's not a drop out because if I play the captured footage on another app the audio it just fine.

Thanks in advance.

Charlie Durand
San Jose, CA

Charlie Durand · May 11th, 2007, 09:41 AM

Quote:

Originally Posted by Johan Bunis

I have exact the same problem, but sorry dont have a answer. But good to see other have the same problem so I/we can appoint its a bug in premiere(?)

What camera do you use, I have a Canon HV20..

edit: Can it be the soundcard, I use my integrate SoundMAX on my Asus P5B Deluxe board.. What board do you have?

I am using a Canon XH-A1. I've used a Canon GL2 with this same computer and never had an issue. I am guessing there is a problem when PPro indexes the captured HDV footage.

I have a Creative Xifi soundcard.

At this point I'm waiting to get my hands on Premiere CS3 to see if it has the same issue.

Mikko Lopponen · May 13th, 2007, 03:56 AM

It happens when there's a dropout somewhere in the file. Premiere's indexing can screw up when it encounters a dropout and the rest of the file then goes out of sync. That's why it only shows up randomly.

The solution is to try to spot dropouts when capturing. It doesn't always happen even if there is a dropout.

Charlie Durand · May 14th, 2007, 09:18 AM

Quote:

Originally Posted by Mikko Lopponen

It happens when there's a dropout somewhere in the file. Premiere's indexing can screw up when it encounters a dropout and the rest of the file then goes out of sync. That's why it only shows up randomly.

The solution is to try to spot dropouts when capturing. It doesn't always happen even if there is a dropout.

So even if Premiere reports ZERO dropouts during the capture, there might still be a dropout there? Plus there's nothing obvious when watching the video.

=AND= the footage plays fine in Windows Media Player for example. Audio and Video are in synch there. No dropouts evident.

When I first got the camera I was experiencing obvious drop outs which turned out to be cheap tapes I was using. I have remedied that problem with higher quality tapes. Those drop outs were very easy to see during playback.

Brian Brown · May 15th, 2007, 11:59 AM

I believe that a traditional capturing "dropped frame" isn't the same as a GOP dropout, and so PPro is blissfully unaware of dropouts. But it will mess up your synch by 15 frames for each one you get.

I find it also important to kill a lot of background processes on the PC (virus scans, indexes, etc.) when capturing tapes.

HTH,
Brian Brown
BrownCow Productions
http://www.brownland.org/blog/

Charlie Durand · May 15th, 2007, 12:20 PM

Quote:

Originally Posted by Brian Brown

I believe that a traditional capturing "dropped frame" isn't the same as a GOP dropout, and so PPro is blissfully unaware of dropouts. But it will mess up your synch by 15 frames for each one you get.

I find it also important to kill a lot of background processes on the PC (virus scans, indexes, etc.) when capturing tapes.

HTH,
Brian Brown
BrownCow Productions
http://www.brownland.org/blog/

Ok, that makes sense as to why Premiere isn't reporting lost frames.

=BUT= does this explain why I can watch the captured footage outside of Premiere and everything is synched up just fine?

I've experienced dropouts in the past and they were in the captured footage regardless of where I played them back. Here I am only experiencing the out of synch audio inside of Premiere. Like I said, I think it has something to do with the index process.

Brian Brown · May 15th, 2007, 12:59 PM

Good point, Charlie! Hmmm... I know you said you can get it to re-index by deleting those files, but have you also tried deleting both the preview and media files (*.cfa and *.pek's) in the PPro folders to try to get it to "re-peak file" the footage?

Does this happen on all mpeg files or just a few?

Just a thought...
bb

Brad Tyrrell · May 16th, 2007, 07:30 AM

This isn't quite the same, but might help.

I really don't know the technicalities but I do know that Premiere reads time codes differently than some other applications. On occasion I've had Premiere totally lose it and start rerunning audio from the top in the middle of a clip.

I record to a laptop using HDVSplit and sometimes timecode gets messed up. I run the m2ts through MPEGStreamclip (free) to "fix timecode" and output as ts file. I rename the ts files to .m2t and Premiere is much happier.

I've always had sync problems with audio in Premiere except when I used Scenalyzer for capture. Streamclip hasn't fixed everything for me but has done a lot. Hoping CS3 with On Location is going to help.

May 8th, 2007, 01:26 PM	#1
Charlie Durand Regular Crew Join Date: Jul 2004 Location: Mountain View, CA Posts: 92	Audio issue with PPro2.0 and HDV capture Hey there, I am posting yet again in regards to my issues with editing HDV footage in Premiere 2.0 I know where the problem is, I just don't know how to fix it. I had posted in the past about the audio getting out of synch with the video when I edit HDV footage. At first I thought it was cheap tapes, so I bought some Panasonic AMQ's. Still happened. If I play the RAW captured footage in another app the audio and video are fully in synch. When I go to edit it in Premiere sometimes they get out of synch. I think it has something to with the process Premiere uses after you've capture the footage. First it indexes the MPEG file, then it runs another process on it. I think something goes wrong during the index stage. I've tried deleting the indexes and letting Premiete create new index files, same results. Anyone else seeing this problem and (crossing fingers) know how to fix it? It's annoying to have to re-synch my audio with the video this often. I'd say it happen about once every 3 tapes these days. Like I said, it's not a drop out because if I play the captured footage on another app the audio it just fine. Thanks in advance. Charlie Durand San Jose, CA

May 13th, 2007, 03:56 AM	#4
Mikko Lopponen Major Player Join Date: Mar 2006 Location: Helsinki, Finland Posts: 393	It happens when there's a dropout somewhere in the file. Premiere's indexing can screw up when it encounters a dropout and the rest of the file then goes out of sync. That's why it only shows up randomly. The solution is to try to spot dropouts when capturing. It doesn't always happen even if there is a dropout.

May 15th, 2007, 11:59 AM	#6
Brian Brown Major Player Join Date: Dec 2006 Location: Estes Park, CO USA Posts: 426	I believe that a traditional capturing "dropped frame" isn't the same as a GOP dropout, and so PPro is blissfully unaware of dropouts. But it will mess up your synch by 15 frames for each one you get. I find it also important to kill a lot of background processes on the PC (virus scans, indexes, etc.) when capturing tapes. HTH, Brian Brown BrownCow Productions http://www.brownland.org/blog/

May 15th, 2007, 12:59 PM	#8
Brian Brown Major Player Join Date: Dec 2006 Location: Estes Park, CO USA Posts: 426	Good point, Charlie! Hmmm... I know you said you can get it to re-index by deleting those files, but have you also tried deleting both the preview and media files (.cfa and .pek's) in the PPro folders to try to get it to "re-peak file" the footage? Does this happen on all mpeg files or just a few? Just a thought... bb

May 16th, 2007, 07:30 AM	#9
Brad Tyrrell Major Player Join Date: Oct 2003 Location: Morristown, New Jersey Posts: 249	This isn't quite the same, but might help. I really don't know the technicalities but I do know that Premiere reads time codes differently than some other applications. On occasion I've had Premiere totally lose it and start rerunning audio from the top in the middle of a clip. I record to a laptop using HDVSplit and sometimes timecode gets messed up. I run the m2ts through MPEGStreamclip (free) to "fix timecode" and output as ts file. I rename the ts files to .m2t and Premiere is much happier. I've always had sync problems with audio in Premiere except when I used Scenalyzer for capture. Streamclip hasn't fixed everything for me but has done a lot. Hoping CS3 with On Location is going to help.