Audio/video sync STILL off, even after detaching/extracting audio

So I know it's a well-known problem that the audio and video clips get out of sync upon exporting a movie out of the iMovie application. I also have seen that the solution for this problem is to detach or extract all and any audio clips. I've done this, and I'm still having the problem after exporting my movie (it plays fine in the application).
I detached/extracted my audio clips when I started making my movie, and have been altering them and working with them separately from the video for some time before exporting the movie. Is it possible this has made a difference? I have re-detached the audio multiple times hoping it will solve the sync problem, but with no success
Has anyone else had this problem? I would be so grateful for some help--it's making me crazy!
Thanks in advance.
Kyoko

I'm having the same problem. Imported clips from FlipcamHD. Everything plays fine in iMovie. I have titles, video clips that I've added music, and regular video clips with its own audio. It's a nine-minute video. I detached the audio from the clips that have audio and still the sync after export is not working.

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Hello Everyone,
I own a 2011 MacBook Pro with a 250GB SSD and 8GB upgraded Ram. I'm currently using iMovie to create an hour long movie with images / audio / and voiceover in certain sections.
I have been working on this for quite some time and would like to be able to export it the same way I'm able to view it inside the Application. However, when I export the movie the audio / video / voiceover is off and it does not match with what I have worked on inside the project.
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Sorry for the confusion. To clarify:
The Video and Audio are OOS. Let's say that at the beginning of the Clip, the difference is ~ 12 frames off. Is it still that ~ 12 frames off at the end, or is it now ~40 frames OOS?
Though the best is to Capture with no OOS issues, the former is fairly easy to fix. The latter takes more work.
Also, whether the OOS is constant, or dynamic, might lead to figuring out where this issue is being introduced.
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Thank you Robert J. Johnston, the_wine_snob, Paul_LS and SteveGrisetti for your help so far.
So this is where I am at now:
Files all seem to be of the same type, so I will just say "the file" for the one I am working with right now.
Loaded file into VirtualDub. I like that program. Well done, whoever made it. Did some basic cutting of unwanted stuff. Saved as AVI. Saved both a Direct Stream Copy and a Full Processing Copy.
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Before I do any more editing work, I decided to save it (SHARE) in different formats to see what happens.
Goal: Looking for no audio sync problems. Best quality I can get with a 1GB file size limit.
Saved as DV-AVI: plays fine. no audio sync probelms. love the video quality. 2.95GB, so too big
Saved as Flash: Do not see any audio sync problems. Do NOT like the quality (flips back and forth between clear and all pixely (is that a word). 32 MG
Saved as Mpeg: Media Player won't play it (thought Media Player with KL Mega Codec played everything?) (It loads it but doesn't play?); Quicktime won't play it. Windows Media Player just did. Do not see any audio sync problems. Like the video quality. 631 MB.
Saved as Windows Media: Do not "think" there are any audio sync problems; if there are, they are very subtle. Not crazy about video quality. Better than flash video option though still flickers between two types of qaulity (if that makes sense) . 52MB
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I have seen the same thing, when using converted MPEG-2 files (converted to DV-AVI Type II in DigitalMedia Converter). Everything was perfect in PrPro, and even when I Imported the edited DV-AVI's into Encore. When Burned to DVD, several scenes had OOS issues. I "fixed" these over and over in PrPro, but could NOT get them to Burn properly - regardless. I chalked it up to the original source files, and/or DMC's conversion. However, it's conversions from all sorts of crap are usually 100%, with no OOS problems. These just gave me fits, and I finally had to tell the client, that unless we could get to the original source files, what you see is "as good as it gets."
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Anyone know how I can fix this issue? It's driving me crazy.
I've just spent a few evenings in iMovie 08, editing together the video of my son's birth. All looked & amazingly good in iMovie. The "Large" .m4v file output by iMovie - Shared with the Media Browser - plays perfectly in Quicktime too.
However, after adding that shared movie to iDVD 08, and burning a DVD, I noticed that the audio sync drifts toward the end of the Movie when plated back. At the start of the DVD all seems well, but by the end of the ~1hr 20 minute movie the audio is unbearably out of sync with the video. Completely unwatchable.
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Then again, perhaps this is totally unrelated to the 12-bit issue, and this is just a run of the mill bug?
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I've tried most of the options I can think of, and the audio sync drift issue continues on this ~1hr 12 minute iMovie/iDVD 08 project.
A couple of promising ideas tried used QT Pro, to export the audio track from the iMovie generated MPEG-4 file - as a WAV file, resampling to 48kHz and 16-bit... then Adding this back to the video track in the MPEG-4 file (having deleted the original audio track). In another test I also tried the Add to Selection and Scale option. Oddly enough I think the Add to Selection and Scale attempt generated more sync issues than before in the final DVD movie... so I stuck with the MPEG-4 file containing the video track and the added, resampled at 48kHz & 16 bit, WAV audio track.
This was saved as a self contained Movie file, producing a QT .mov file. I moved this .mov file into the iDVD projects directory structure so that it was avalable in iDVD's Media Browser. I then reworked the iDVD project to use this QT large.mov file, instead of the original iMovie large.m4v file.
As a reminder... the original large.m4v file has the following properties:
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The resampled and saved QT MOV file has the following properties:
29.97 FPS H.264 Decoder, 960 x 540, Millions
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I've not yet tried to burn either the original iMovie produced MPEG-4 video file or my QT Pro tweaked audio track .MOV file version to a DVD on my PC...
... But I have used an application called Burn (referenced in this earlier/archived iDVD sync drift forum post: http://discussions.apple.com/thread.jspa?threadID=1332100 by user F Shippey - http://burn-osx.sourceforge.net/) to take the QT Pro tweaked .mov file version of the original MPEG-4 file and burn it to a DVD...
Results:
The Burn app burnt DVD plays with NO audio sync issues!... Even though it was generated from the same audio tweaked (48kHz/16-bit resampled) QT Pro .mov file.
However, whenever I burn a DVD using iDVD 08 the audio sync gradually drifts. It matters not whether I use the original iMovie 08 generated MPEG-4 movie file, or the QT Pro version of that file with the resampled audio track (the same one that works fine with Burn).
It sure looks to me like iDVD has a problem... Again, refer to http://discussions.apple.com/thread.jspa?threadID=1332100 for someone else who seems to have run into similar challenges.
Am I overlooking something?
Thanks in advance.

Audio/video sync STILL off, even after detaching/extracting audio

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