Audio Drifts Out of Sync After Demux

Hi,
I demuxed an hour-long program from DVD to .m2v and .ac3 using MPEG Streamclip. The audio drifts out of sync very gradually, and by the end is way off.
I don't want to re-compress the audio, as it is already AC3. According to Quicktime, the video is 29.97 fps, and the audio is 16-bit 48 khz.
When I used to Export to DV option, everything stayed in sync. I can't go this route, however, since I can't afford to re-compress anything (I'm making a new DVD from this old one). Just an FYI that this worked.
Ever run into this problem before?

I am using version 1.9. In the preferences pane, I don't have anything checked.
To reiterate, all I'm trying to is demux the DVD as-is and bring those assets into DVD Studio Pro for an updated project. Not using FCP anywhere in this workflow.
Looks like I left out an important piece of info, though...When I demux the audio stream to AC3 (its original format), and try to import it into DVD Studio Pro, I get the error message: "Variable bit rate audio assets cannot be imported." I am not sure how the client originally encoded their audio, but the fact that it stays in sync on the DVD led me to believe they didn't do anything wrong. Could this VBR be throwing the audio off during the demux? The only instances where I've noticed it's out of sync are when I export to an uncompressed format like AIFF or WAV, and can actually view it.

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Audio drifts out of sync since Quicktime 7.6 update!

Help!
Seems like ever since i updated the Quicktime to 7.6 my uncompressed 8 or 10 bit sequences for playout to digital betacam drifts out of sync over time!
But when i just go to the end of the sequence and hit play, everything seems fine.
I just restarted to my old Tiger system and there the problem doesn't seem to be there.
Any ideas??
I use the blackmagic Multibridge Extreme.
Another strange thing is that when i playout to HD, there is also no problem!
Thank you for your time,
Steve Pittoors

I have had my audio drift out of sync also, not with Betacam, but DV. I basically send the audio from FCP to STP and tweek the audio, and then on export back to FCP it adds about 10 frames worth of audio. It starts in sync and then drifts by the end of the sequence. I have had no problems with shorter sequences - ie. 30 sec. The one I am working on now is just over 6 minutes. What is weird is that the sequence length in both FCP and STP are the exact same, but when I export back it drifts and adds in the extra frames.
I tried fiddling with all the framerate settings in STP and it still does it.
I posted last night in FCP and STP forums and haven't had any luck.

Audio drifts out of sync in QT

I have just completed a 30 min., 20 sequence piece. When I create the reference movie the audio drifts out of sync.
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Thanks for taking an interest, Studio X.
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My audio goes out of sync after import

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So this is my first slightly larger project in Final Cut Pro X.
When I export my finished project (around 12 minutes long) straight to quicktime, it plays back perfectly.
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Audio is out of sync after capture.

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Audio falling out of Sync after importing into PP

Hello there,
I'm relatively new to this, so please when you're helping me, dummy it down as much as you possibly can.
I've been using Xsplit to record games while I play. I recorded a ~2 hour video and toward the beginning of the video it seems to be pretty a-okay but later in the video when I play it in premier pro, the audio starts falling out of sync.
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If your current video file DOES use a Variable Frame Rate, it will not edit properly in any version of Premiere
Force your software to create a Constant Frame Rate file and try again
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variable frame rate
or
VFR
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Audio drifts out of sync.

Help!
Seems like ever since i updated the Quicktime to 7.6 my uncompressed 8 or 10 bit sequences for playout to digital betacam drifts out of sync over time!
But when in FCP i just go to the end of the sequence and hit play, everything seems fine.
I just restarted to my old Tiger system and there the problem doesn't seem to be there.
Any ideas?
I use the blackmagic Multibridge Extreme.
Another strange thing is that when i playout to HD, there is also no problem!
Thank you for your time,
Steve Pittoors

Might try reloading drivers for the capture card... sure sounds like it may well be the problem if non converted footage is in sync...
If this fails, try exporting the HD sequence to compressor and compress it to SD there, then lay out the resulting file from FCP not having the capture card do any conversion.
Jerry

HELP! Audio goes out of sync after export!

OK, folks. I need your help. I have a looming deadline of THIS FRIDAY to hand this in.
I have a finished multicam edit of a show that runs 1 hr 20 min. It plays back perfectly in the timeline, all video and audio perfectly in sync. Looks and sounds exactly like what I need.
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MacBook Pro Retina (Rev. A)
Premiere Pro CC (latest version)
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OK, I figured out how to fix it:
In Premiere Pro CC, click on SEQUENCE > DELETE RENDER FILES.
Try exporting the movie again.
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Cheers!

CD Audio Drifts Out of Sync

Ok, I know this is a known problem as long ago I read something on this, but for the life of me can't remember.
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Otherwise, is there another solution?

I've never had to do anything as long as a wedding, as far as syncing CD audio--just dance performances that are usually less than 5 minutes, so I don't notice any drift. I don't know if this will work or not, but it might be worthwhile trying to resample the CD audio (which is 44.1kHz) to 48kHz.
Use your CD ripper of choice (CDex, for example) to extract the audio to a PCM WAV file, and open that up in your preferred audio editor (Audition, Soundbooth, Audacity, or whatever). Save the file back to a PCM WAV file, but set the sample rate to 48kHz. Import that file into PPro and replace the original version, then check for "unsyncing". As I said, I'm not sure if that'll work, but it's worth a shot.

Audio goes out-of-sync after adding photos to video

iMovie HD 5.0.2 here. I have one main 10-minute video clip and am trying to splice the video to include a few photos, which maintaining that video's audio track throughout.
After importing the video, I extracted the audio. But when I dropped in a photo, any video AFTER that photo is now out-of-sync with the audio track. (I'm not really fiddling with the visual timeline; I just split the video clip at playhead, insert photo, and any video after the photo winds up out of sync.)
Is this a problem with the dated software? Is there a workaround? If I should upgrade, what should I upgrade to? I really love the simple video and audio timeline of iMovie HD; it's perfect for my needs and I don't want to lose it...

OK
I'm a soft head. Now I understands what You want to do.
OK there is a smart way to exchange video for a photo but keeping the audio. BUT
I use a much more raw way of doing this.
I import my photo. Set a duration for it eg. 4 sec => 00:00:04:00 exactly
then I select the video clip
Extract sound - so that I don't affect this when doing the brain surgery
Cut in the video part away exactly 00:00:04:00
Select the photo clip - drop this before the un-needed video clip
Select the un-needed video clip and delete this.
Now I've replaced a pice of the video with a photo but the sound flows as it
was un-tuched.
I always work this way - think it has to do with super-8 film editings during
the stone-ages.
There is a function in iMovie that does this - replace action but I've never used it.
Yours Bengt W

Audio Video out of sync after Capture

I've read thru the Discussions posted but can't seem to find the exact same problem....
This has happened in both FCP5 and FCP6..
Last nite I captured wedding video into FCP6 from 2 identical cams with identical settings..The 1st Capture (18:00) went OK but the 2nd Capture of the same duration showed a window and transport bar. It stated something to the extent "analyzing audio". It's done this in the past and every time it occurs the audio is exactly 30frames off. The video precedes the audio by 1 second. It's easy to re-sync the two but annoying when it happens.
I'm capturing both videos into the same document so no settings change and the problem is not specific to just one camera. It has happened on both cams. I'm using the same tape deck to capture both videos and the same mini-DV tape brand.
Anyone have any thoughts?
Thanks

To nomadesign: I've not tried that. I use the tape deck to reduce wear on the heads of the camera. If I knew which clips would have this prob then I could use the cam which originally shot the vid. I guess I could go back and re-capture the footage which slipped out of sync using the cam which shot it just for a test.
To 2reverb: the video was captured at 48khz. When I first got the cams they were default set to (is it 34 or 36khz) and i discovered the prob very rapidly so I corrected the cams right then.
Thanks to both of you!!!!

Audio Drifting Out Of Synce when Exporting to Quicktime

Using FCS2 and all material is HDV 1080i60 with audio 48k. Everything in my sequence plays and renders fine and is in sync. When I export to quicktime movie using current settings the sound goes slowly out of sync so that by the end of the project the sync is horrible and the actual project is short 11 or so frames??
Any suggestions?? I have always done this in the past with no problems but since switching to FCS2 I have had nothing but problems when this comes up.

I had a similar problem when I exported a 20 minute video to an .flv Playback looked and sounded fine but the .flv file direct out of Final Cut was out of sync with audio. I finally used the Render Manager under tools to remove all renders for that sequence and then just re-rendered in one shot. That export was clean. I had tried to break renders and re-render them but it didn't work, but the Render Manager seemed to fix what ever caused it. I haven't noticed again since on any other projects. Good Luck.
Rich-

Audio Drifts Out of Sync After Demux

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