Video drifts out of sync as video progresses

Basically I'm trying to record guitar covers for my youtube channel, so i record the video through my iPhone, the guitar through garageband and then combine the 2 in iMovie (Version 10.0.7) with the song from iTunes as a backing track. However, I've noticed that as the video goes on, the video and the audio slowly drift out of sync so by the end they're completely out. It's definitely the video as the garageband and the song match up throughout the video but the video goes out. Help to solve this?

This tutorial video may help:
http://www.youtube.com/watch?v=GPCXPxTyZbM
Also, this User Tip offers a possible solution:
https://discussions.apple.com/docs/DOC-1726

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Video import, multiple camera - drifts out of sync

Hi - I've been using iMovie for years, am now starting with Final Cut Express because I have a project with multiple video tracks. Here's the problem: I've imported video from two cameras that were used simultaneously to record a play. I can sync the two video clips together, but if I sync them at the beginning of the clip, then at the end of the clip they are close to a second apart - they 'drift' progressively further out of sync as the clip goes on.

Sorry, I accidentally submitted the question before I had finished entering it ... here is more info ...
This is NOT an audio/video sync issue, which I have seen reported elsewhere. Each of the clips from the two cameras has its ownaudio track which is in sync with its own video. But both video/audioon the clip from camera 1 drifts out of sync with the video/audio fromcamera 2.
Finally, another (possibly related) issue.In addition to the video from the two cameras, I have an audio trackwhich was recorded on a separate audio recorder. This also drifts outof sync with the video - in fact it is not in sync with EITHER of thetwo imported video tracks.
All the video clips are thesame in terms of frame rate, sample rate etc. The audio track has thesame sample rate as the video clips. The only thing I can think of thatmight be an issue is that while two different MiniDV cameras were usedto record the play, I only had one camera available when it came timeto import - so I imorted the video from both cameras using the samecamera. So the video from camera 1 was imported using camera 1, but thevideo from camera 2 was imported using camera 1 as well.
Any suggestions?? thx

Why is the video and the audio in iTunes drifting out of sync?

This has been happening for awhile, and it is annoying me quite a bit. I can run the video find directly through QuickTime. I have been serching for an asnwer for awhile now. I have the most recent version of iTunes 10.5. Help would be appreciated. System specs below.
CPU: Intel i7 2600
Graphics Card: ATI 6990
Motherboard: Intel DZ68DB
RAM: 8GB DDR3 Ripjaw
OS: Windows 7 Professional 64x
The video usually begins normal, but within seconds the audio and the video drifts out of sync. Pausing and playing the video helped for a few seconds, but it quickly drifs out again. Help would be much appreciated. Thanks!

Im having this problem too, upgraded my laptop to windows 8 and the audio and video sync makes movies and tv shows unwatchable. I have tried re-installing itunes but this made no difference

When exporting separate audio and video streams, the audio drifts out of sync

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.
When I export using compressor, the resulting audio and video streams are two different lengths. The audio comes out a full second longer. If you try to lay them down in a program like Adobe Encore, the audio starts out perfectly in sync. Two minutes in you notice the video is slightly out of sync with the audio. By the end of the video it's comically bad, over a second out of sync.
What's even more vexing is if I try to take the quicktime file that IS in sync upon playback, and try to convert it burn that to a dvd or blu-ray using toast, the problem re-emerges.
I triec searching around, but most of the suggestions that came up were vauge, like, "Upgrade to a real program like Final Cut." (This was in reply to people who were using free software programs.)
I did see one idea surface where 44 and 48 kHz sampling rates don't play well together. So I combed through my project and found all the 44.1 songs that were used, and swapped them out with upsampled versions. Nothing changed. It didn't sound like it would fix it, as people usually said it was a specific amount of frames off, not something drifting out of sync.
So the question is, does anyone have any suggestions on what could be causing this? Thanks! :-)

Project settings can be accessed and changed by selecting the project and pressing command-J. Then, in the inspector, click on the little gear in the lower-right hand corner to access the settings.
Why are you trying to output video/audio separately? If the content plays in-sync when exporting a quicktime movie (using current project settings), you could try separating the video/audio using MPEG Streamclip as a second step instead of using compressor. For audio, don't change the sample rate from the project settings, and use uncompressed audio (AIFF) as the output format.

Audio slowly drifts out of sync with video

I have a long continuous video clip (.MP4) that has an audio sample rate of 48 kHz. Separately, I have an audio clip (.mp3) for that take that was recorded at 44.1 kHz.
I created a sequence in Premiere with the .MP4 making sure the sequence's audio sample rate was set to 48. I brought the .mp3 into Audition where I used Edit > Convert Sample Type to change it to 48 kHz.
Back in Premiere, I dragged the converted .mp3 into the sequence and the audio still drifted out of sync toward the end of the clip.
Am I missing a step? How can I make sure the audio and video are in sync throughout rather than just in the beginning?

Two independent record devices will not stay perfectly synchronous over a long period of time unless locked via timecode or a sync cable.
A solution is to scroll to the end of the clips and adjust the speed of the mp3 file (making it run slightly faster or slower) until the end of the camera audio and mp3 audio coincide.
MtD

Live multitrack recordings drift out-of-sync with video

This is the second time in two years that I've encountered this intermittent problem, and I can't figure out what causes it or how to solve it. I made a video recording of a musical group and simultaneously made an 8 channel multitrack recording of the same performance using Audition and a MOTU 8pre. When I try to combine the mixdown from Audition with the video file in Premiere, the audio from the two sources starts to drift out of sync after about two minutes. This doesn't seem like it should be possible, as both are digital sources. Has anyone else ever encountered this? What is the cause? Is there a solution?
What makes this more mysterious is that I've also used the same technique on previous occasions without experiencing this problem.

"You say that there is a fix for the division problem. If you don't mind, could you tell me what that might be? "
The reason 48k was chosen as THE sample rate for broadcast video is that there is a straight easy (integer) relationship between frame & sample rates for all used frame rates bar 29.9700299700.......... [yup it's an infinite unresolvable number] where though not simple it was still a lot easier to resolve if not perfectly but to a tolerable/usable level the arithmetic problems. Good news is this happens automatically in the editing software so long as enter the true known info IE 48k for audio 29.97 drop frame for Video. Conversely it won't {probably} if you choose 44.1.
Getting 29.97 in sync is complex however and may involve using .1% "pull-up's & down's Basically the Color frame rate in the States is .1% less than the B&W rate of 30fps. If video is actually at 29.97 but counted as though 30fps there will be a little over 2 sec error per hr.
tell me what was the diffeence in length you got per hr min or whatever?
One solution of many is to use an actual sample rate of .1% greater than 48k IE 48048k & it gets even more complex if using timecode
Word clock
It's a 5volt square wave, carried on a BNC cable, used solely for audio syncing. No video equipment understands word clock.
Pro video equipment can use video sync aka Black & Burst - a feed of which also using a BNC cable can link / tie the clocks of a number of cameras and also some audio equipment so they are absolutely in sync (unfortunately for you not the Motu 8pre which as far as I can see has no external sync possibilities)
Your "workround"
yes of course regardless of what is causing the problem, a time stretch / compression of the appropriate amount can make the pic & sound the same length and so joy.

Audio drifts out of sync PE 3.0

After I burn an .avi onto a DVD, the audio is fine at the beginning but starts to slowly delay as the movie progresses. It drifts out of sync as the movie goes. What do I need to do to keep the audio in sync with the video?

This is aimed a Premiere Pro, but may help - First, work through the steps here http://ppro.wikia.com/wiki/Troubleshooting
If your problem isn't fixed, report back with the DETAILS asked for in the questions at the end of that link

Exported mixes from STP drift out of sync

STP seems to have a mind of it's own. Mixes that use to export fine are now drifting out of sync over time, about 2 seconds over fifteen minutes. If I export the mix either directly from STP or through Compressor, it drifts.
However if I export with video (through Compressor), the audio is in sync properly.
Does anyone on the STP team have a clue as to what this might be? It's driving us nuts!
Michael Buday

Thanks Gavin. I often do the same thing, export projects with a large number of tracks through Compressor because exporting directly from STP is just too unreliable (missing EFX, keyframe levels/pans missed entirely, etc.)
I tried exporting as usual through Compressor using the standard 48:16 preset, but again - drift. When I then switched to PRESERVE VIDEO with the same audio settings, the sync was fine. This is a workaround, but a real pain in the butt because I then have to extract the audio out of the .mov file. Not rocket science, but just too many steps to do all the time.
The weird thing is, this has happened only three times out of about 50 projects, but once it occurs, it's as if the project is corrupted in some way and it never exports properly again.
Michael Buday
G5 Dual 1.8 GHZ Mac OS X (10.4.3) FCP 5.03, STO 1.01

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.

Why is my dialogue track drifting out of sync?

I have a 5 minute clip 1280x720 - I am using Apple Pro Res 422 and H264 - Clip plays beautifully in the timeline, but when I export the clip as a QuickTime Movie, self contained and NOT recompressing frames, the dialogue track drifts out of sync after 60 seconds. I am approx. half a second out by the end of the clip. HELP!!!

It's a little unclear. What format is the clip (Codec, and audio sampling), and what format is your sequence? If your clip or sequence are h264, that's probably the problem. h264 is not suitable for editing and sources should be converted to a fcp friendly format before editing. Also, all source audio should be 48k 16bit aiff with your sequence audio settings the same.

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

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.
It plays fine in FCP (5.1.1). The properies are matched at 1080i50 and 48k in FCP and QT.
Would appreciate some help.

Thanks for taking an interest, Studio X.
I didn't do the capture, but the media and sequence settings are matched and the QT properties are too at 1080i50 and 48k. I'm not using an external monitor, just viewing from the timeline. I'm done with the project, I was just trying to save myself a copy before it goes to the compositor and composer.
I think I remember reading a post on the same problem somewhere else and it came right when it was encoded for MPEG 2. I'm trying that now, will post the result.

Audio and Video Slowly Drift out of Sync

Ok so I'm hoping someone can help us out here.
So we have a video that was recorded 20 years ago on VHS tape. We captured that footage using a converter into FCP 7 using the DV-NTSC Capture preset with 48khz for audio.
The sound on that tape is awful and thankfully, we had a cassette tape that recorded all the audio. We used another converter to record that into pro-tools and bounced it out of pro tools using 48khz preset. Its currently a AIFF file.
Once we brought the two together in FInal Cut Pro, it starts off in sync but slowly drifts out about half way though. Any idea?

Find two sync points - one near the beginning and one near the end - maybe a syllable of speech, where you can see the mouth movements?
Put separate markers on your video and audio at all four points. Adjust the speed of the audio until the markers align.
You can calculate the new speed you need if you measure the lengths on the timeline accurately, and get the markers to match within a frame - plenty good enough over the whole timeline.

ITunes audio/video drifts out-of-sync

I have for a while been having problems with watching videos I have downloaded from the iTunes Store on my PC. I'm running windows 7, all my drivers are up to date, and the videos play fine if I open them up in Quicktime. If I watch them in iTunes, however, the audio and video get out of sync rather rapidly... If I watch a show in iTunes, I need to pause and restart it every 30 seconds or so, otherwise it just becomes too annoying to watch. Clicking pause then play again syncs it back up, but again it doesn't last long. I open the files in Quicktime and they play just fine, and considering iTunes just uses Quicktime for video playback, the problem must be with iTunes. I have gone through several iTunes updates, hoping with each one that the problem gets fixed, but it never does... can anyone help me??

Also been experiencing this for some time now, win7 x64 and same sort of pc specs to all you guys, fixed it just this evening so hopefully it's not just a fluke!
Two things to do, first in quicktime preferences, audio tab, under the sound out field, rate change too 44.1khz, size to 16 bit and make sure channels matches you windows default. Now you need to make sure your audio driver software matches these settings (as that is the software that controls the sample rate and bit depth in shared mode); mine is realtek HD audio manager, so for anyone else who has that, go to the default format tab make sure it is '16bit, 44100hz (CD Quality)'.
I'm not a big expert on this so I can't say why itunes suddenly has a problem with these settings or why it makes a difference, I just hope that this fix works for you as well because I have been looking for a solution online forever and it's driven me insane!
Good luck!

Video drifts out of sync as video progresses

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