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.

Similar Messages

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

Audio drifts out of sync with video

Hello --
I just watched the pilot for Conviction in iTunes on my PowerBook. The audio was just fine at the beginning, but by the end of the episode the audio was about 2 seconds behind the video. Everything on my system is up to date (OS, iTunes, Quicktime). Are others experienceing this and can it be corrected. I tried just pausing the video and restarting it but that did not correct the problem.
HELP! (and thanks)
-- Steven

so new versions of iTunes have seemed to correct this problem.

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

Video - dialog goes out of sync with video

When I play Movies or T.V. shows on my iTouch the dialog (or audio) gets out of sync with the video. It starts happening after about 5 minutes of play. I close out of the video, re-open it and it's back in sync again for about another 5 minutes.
I had a second generation iTouch and have just purchased a 3rd gen iTouch and it does it on both. It happens on every movie or t.v. show I watch.
Any suggestions?

I really appreciate your help. I tried it with the link you provided and it appears it's the wrong format type. The one I'm trying to convert is a .wmv file. I think that link was mainly for mpegs.
I did successfully convert a 3rd movie .wmv file using videora, so I have to think the problem lies with this one movie clip. What could it be? It plays fine on my computer! The video itself is fine after the conversion too, it's just moving too fast as if in fast forward mode. Then when the video ends (before the music, cuz it's not in sync), the video keeps backing up and continuing from later and later previous spots until the song ends.
If you're out of ideas, I guess I'll try to see if I can find the video somewhere else and download it again (I got this video free from a website). It's super cool.. An F-18 pilot video tapes himself performing aerial maneuvers to the song "magic carpet ride". Darn, I REALLY want that on my ipod!!

My iTunes is playing the films with sound out of sync with video

I bought some films off of the iTunes store and whenever they're playing, the sound is out of sync with the video. Why is this?
Please help.
Sam.

Maybe this will help. My first movie I made in IMovie approached thirty minutes long. I read in a book that any movie made in IMovie that approaches that length or longer will start to lose sound sync. The trick is to extract the audio from the video. Sure enough it worked for me.

Audio out of sync with video in timeline SOLVED

The audio and video are in sync when playing .MP4 video (but may apply to other video files) in the Premiere Pro viewer and Windows Media Player and VLC however, as soon as you drag the clip into the timeline it goes out of sync. Since it took so much time for me to figure out how to get around this problem I wanted to share this, ESPECIALLY For all the people who are semi Adobe Premiere noobs (with no disrespect, I fall into this category) at this and google isn't helping to figure out why this is happening I'll give you the easy fix. For all the people in this forum who are going to ask the detailed information, codecs, etc. I'll give that as well.
FOR THE NOOBS:
All the information I've read online all seems to point that the timeline sometimes doesn't like certain audio contained in the video. It conforms incorrectly, etc. Personally, it doesn't make any sense to me. Forget all that.. you just want to get on with your project.. to heck with the details, you're tired of googling. Here's the solution I found. Extracting the audio from the problematic video file outside of Adobe Premiere. I use avconv, because it's free, open source, and you won't lose audio quality. Then linking that audio with the video in Adobe Premiere.
First if you are using a windows 32 bit computer download avconv here: http://win32.libav.org/win32/
If you are using a windows 64 bit computer download avconv here: http://win32.libav.org/win64/
go to the bottom of the page and click on the newest date version. DISCLAIMER: This is open source software. It's free. I didn't make it so I'm not trying to sell you anything.
It's a zip file so you will need to use winzip or 7zip to uncompress it. You can't just click on the installer. You can uncompress and save the program wherever you want on your computer. Say you didn't pay attention and you automatically saved it in the default spot in your downloads folder. The place you'd find the program might look like this if you're on a 64 bit computer:
C:\Users\youruseraccountname\Downloads\libav-9.7-win64 If you're on a 32 bit computer it will probably look like this C:\Users\youruseraccountname\Downloads\libav-9.7-win32
Just make sure you know where it is located and copy it down in notepad. If you can't find it, do a search on your C: drive for avconv .For this forum thread we will assume you have saved avconv in the downloads folder and you're on a 64 bit computer.
Click on the Windows key on your keyboard. Type in Run and then press enter. Type in CMD and press enter. This will open up windows command line. Don't worry, it's not as scary as you think.
Now hold down the Windows key and press E. This will open up a windows explorer window for you to find the video file you are having issues with in Adobe Premiere. Once you have found the file, copy the location of the file. So.. if your file was here: c:\Users\youruseraccount\videos\yourvideo.mp4 you would see that at the top of the windows explorer in what's called the address bar. Copy that. Paste it into your notepad.
Now switch back to the windows command line window. Now I'm going to have you type a command into the windows command line but before you do I want you to understand how to type it in.
#1. Do you know the exact path (location on your computer) where you installed avconv?
#2. Did you copy the exact path (location on your computer) where you have your video file?
If so.. type in the command below but change it with the information you have above
C:\Users\youruseraccountname\Downloads\libav-9.7-win64\usr\bin\avconv.exe -i "c:\Users\youruseraccount\videos\yourvideo.mp4" -vn -qscale 1 "c:\Users\youruseraccount\videos\yourvideo.wav"
So let's break it down so you understand and help troubleshoot any issues you may have.
C:\Users\youruseraccountname\Downloads\libav-9.7-win64 this is the example location we said we installed avconv. The actual avconv.exe program is located inside that folder so the full path would be this: C:\Users\youruseraccountname\Downloads\libav-9.7-win64\usr\bin\avconv.exe
-i just tells avconv what the input file is.
"c:\Users\youruseraccount\videos\yourvideo.mp4" is the path (location on your computer) where your video file is.
-vn just tells avconv you only want to extract audio from the video
-qscale 1 just tells avconv you want the best quality
"c:\Users\youruseraccount\videos\yourvideo.wav" just tells avconv the path (location on your computer) and the name you want to give the audio file you're taking from the video. This will save the audio wav file to the path (location on your computer) where the problematic video file is saved.
Once you have the audio wav file import it into Adobe Premiere. In the timeline, unlink the audio from the mp4 (or whatever video file you have). Highlight the now unlinked mp4 audio and delete the audio. Then bring your audio wav file you created using avconv and bring it onto the timeline at the start of the video. Now link it. Hopefully that did the trick.
If you have any questions regarding the command line or installing avconv please feel free to comment and ask. I'm pretty good at windows command line and can probably help identify what the issue is.
FOR THE INFORMED PREMIERE PRO USERS:
Here are the details of the problematic video file that I had this issue with. This is from avconv:
Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp42mp41
    creation_time   : 2013-05-12 11:45:32
Duration: 01:58:28.24, start: 0.000000, bitrate: 3256 kb/s
    Stream #0.0(eng): Video: h264 (Constrained Baseline), yuv420p, 1280x720, 2997 kb/s, 25 fps, 25 tbr, 25 tbn
    Metadata:
      creation_time   : 2013-05-12 11:45:32
    Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, fltp, 256 kb/s
    Metadata:
      creation_time   : 2013-05-12 11:45:32
I don't know the type make/model video camera that was used or if it was converted before being given to me. This is just what i had to work with and the solution I found to fix it.

if you are using a windows 32 bit computer
Then you won't be using anything above Premiere Pro CS4, and this thread would be in the wrong section.
By the way, the process is significantly easier using something like Xvid4PSP, which can strip out the audio using a fairly easy to understand GUI, as wel as convert those oddball videos into something PP can handle.
http://www.videohelp.com/tools/XviD4PSP (Use version 5.)

Sound out of sync with video

When i watch the video on my ipod the sound doesn’t match up with the mouths of the characters, I used quicktime pro and adjusted it to sync well with the video, in quicktime the sound and video match up perfectly but as soon as I put it on the ipod then its out of sync.

Anybody have any suggestions? Or is there a different way to adjust the sound with video?

Teouble with audio becoming out of synce with video.

Hello, I'm using final cut to edit my videos but for some reason, FCP has been giving me some issues. In my work flow I often layout two long video track in the timeline, then I will chop up the top track to create transitions from the top to the bottom and vise versa. as soon I press play, it the video will start off in a slower speed almost as if the computer is overloaded, then it catches up to normal speed in about a second. This has really been driving my crazy. It also effects the way video syncronizes with audio. I can lay both video tracks on top of one another perfectly in sync with the audio, but as sometime once it get's to new scene or the video switches to another track the audio is no longer in sync with the video. sometimes I can stop the footage, then press space bar to copntine and the audio and video will be in sync. This is really weird and I was wondering if anyone has any answers for me. I'm pretty sure it's not an overload on the system because the projects are rather small, and I'm using a quad core 2.5, with 5 gig of ram. and this is my graphic card info
NVIDIA GeForce 7800GT:
Chipset Model: GeForce 7800GT
Type: Display
Bus: PCI
Slot: SLOT-1
VRAM (Total): 256 MB
Vendor: nVIDIA (0x10de)
Device ID: 0x0092
Revision ID: 0x00a1
ROM Revision: 2152.2
Displays:
Cinema HD:
Display Type: LCD
Resolution: 1920 x 1200
Depth: 32-bit Color
Core Image: Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
HWP D5259A:
Resolution: 1280 x 768 @ 75 Hz
Depth: 32-bit Color
Core Image: Supported
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Thanks so much for you time.
Mike

Yes. Those that are designed to work with A/V files will work better.
Drives from G-tech and Granite Digital are worth a very close look.
However, if you have an empty drive bay in your G5, a second internal SATA drive is the better choice.
good luck.
x

Clip audio is out of sync with video

After analyzing the clip the code tells the tale. The audio is "shorter by 1 1/2 seconds yet the time line doesn't reflect it. I want to fix the problem but the tool I found requires the clip (red rectangular box with the +/- info.) to option/click on to be given the re-sync tool action. Other solutions require complicated solutions. My question is "What happened to cause this sync problem and how can I avoid it in the future. ie: no evidence of =/- red boxes to show that there is a problem even thought it clear when you look at the video clip ?

We are missing fundamental information:
What codec does your source footage use?
What is the audio sampling rate on the source footage?
What are the Sequence settings in FCP and does what you see there differ in any way to the properties of the source footage?
Version of Mac OS X, FCP and QuickTime?
Also; if you have a 2 x 3 GHz Dual-Core Intel Xeon Mac OS X 10.6.6, it's a Mac Pro, not a G5.
Message was edited by: Nick Holmes

Sound out of sync with video HELP pLZ!

i just got my ipod and i was wondering if anyone knew how to fix this problem i have. What happens is when i play my video its even to start then maybe a minute or two into the video the the sound is saying something that hasnt been seen yet( if that makes sense) any help with this would be really appreciated!!

The problem:
http://www.dvformat.com/htm/features/2000/800/dv_formatfaq.htm
(Scroll down about two thirds to "What's the difference between locked and unlocked audio?" )
The solution:
Always use 16-bit/48kHz audio.
iMovie: Audio and Video Lose Synchronization
http://docs.info.apple.com/article.html?artnum=61636
A few possible solutions here:
http://www.danslagle.com/mac/iMovie/audio/1001.shtml
iMovie: Improving audio and video synchronization
http://docs.info.apple.com/article.html?artnum=42974

Audio is out of sync with video

I have a project that includes still photos, video clips and background music. I did all the basic stuff (clip trimmer to mark the beats, aligned the photos/videos to the beats, etc.). It all works well except there's a glitch in the transition between two of the videos.
At the end of the first clip, there's a short segment (1-2 seconds) where the first clip turns into a still and the audio from the second clip starts while the first clip is still displayed. Throughout the second clip, the audio is off. If I start playing from the second clip, the audio is in synch.

iMovie: Improving audio and video synchronization
http://support.apple.com/kb/TA25603?viewlocale=en_US

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

Audio several seconds out of sync with live video stream.

I did a live stream last week using 282,482,832,1500Kbps streams. What would cause the audio to get out of sync with the live video stream? I'm trying to determine if it was bandwidth related, cpu/memory issue on the FMIS 4.5 server, or an issue with encoding PC exceeding it's limits?
Thanks,
Dave

Which device are you using? Are audio and video coming from the same device or different devices?
Is it a USB device? Try changing the device and see if there is any difference. Changing bitrates will not affect audio-video sync.

Change of Video Frame One Sample Out of Sync with Correct Point on Timeline

Change of Video Frame One Sample Out of Sync with Correct Point on Timeline.
It has been found on the author's PC that, in Audition 3 in Multitrack View, a video file displayed in the video window will change its frame one sample later than it should do with respect to the correct point on the timeline. This has led to extra work having to be done by the author, as detailed later.
To demonstrate this issue:
Create a new multitrack session. Enable the Time and Video windows. Enable only 'Snap to Frames'.
Using an external program, render a two-frame video clip at 25fps. Let the first frame contain the letter 'A', and the second frame contain the letter 'B'. Making sure that the Display Time Format is set appropriately, in this case at 'SMPTE 25 fps (EBU)', lock this clip on the multitrack timeline, ensuring that the clip starts at time 00:00:00:00.
Create a mono audio clip of silence at 48kHz 32-bit that is two frames long. Lock it on an audio track, ensuring that the clip starts at time 00:00:00:00.
Place the cursor at time 00:00:00:01 and create a cue marker at this point by pressing F8.
Zoom into the timeline so that approximately twenty samples are visible, with the cursor lying on the cue marker in the middle of the screen. The Time window should display 00:00:00:01. The Video window should display the letter 'A'.
Move the cursor back in time (leftwards) by one sample. The Time window should change its display to 00:00:00:00, whilst the Video window should still show the letter 'A'.
Move the cursor forwards in time (rightwards) by one sample, so that it overlays the cue marker again. The Time window should change its display back to 00:00:00:01, whilst the Video window remains showing the letter 'A'.
Move the cursor forwards in time (rightwards) by one more sample. The Time window's display should remain at 00:00:00:01, but the Video window should now display the letter 'B'.
As can be seen from the above steps, the video's change of frame content occurs incorrectly one sample later than it should; the change of video frame content should occur simultaneously with the change of the frame number displayed in the Time window, which is at the point that the cue marker has been placed.
The practical effect of this issue is that it has caused the author a huge amount of extra work on an 89-minute long soundtrack-for-video timeline. There were over 1100 changes of shot which the author wished to mark by placing cue markers at the beginning of every shot. This should have been a quite simple process of enabling 'Snap to Frames', stepping through the video, and laying cue markers down by pressing F8 when the shot was seen to change.
Because currently the Video window (referencing the cursor laying over a cue marker
i that has been placed on the timeline using the 'Snap to Frames' option
) will actually display the end moments of the previous frame rather than the beginning moments of the current frame, laying down a cue marker when the shot is seen to change will actually place that marker at the beginning moments of the second frame of the new shot, not at the beginning moments of the first frame of the new shot, i.e. the cue marker placed will be one frame later in time than it should be. If it is wished for the cue marker to, as best it can, represent the beginning moments of the first frame of the new shot, it has to be manually repositioned so that it is at least a sample later in time than the time at which the shot has actually changed, in order for the Video window to correctly display the content.
The author had to manually reposition all 1100+ cue markers.
Ideally, the Video window should display a change of video frame in synchronization with the change of the frame display in the Time window, which occurs at the position of the 'Snap to Frames' point.
Part of the PC system's specification is detailed below:
Windows XP Professional Version 2002 SP3;
Adobe Audition 1.0 Build 3211.2;
Ad

obe Audition 2.0 Build 5306.2;
Adobe Audition 3.0 Build 7283.0;
ASRock 775dual-VSTA motherboard, BIOS Version P.3.00;
2.80 GHz Intel Pentium D Processor 915 2x2MB L2 Cache;
2GB DDRII 667 RAM;
Matrox G550 DualHead AGPx4 VGA card for Audition's two main work screens;
Matrox Productiva G100 MMS PCI VGA for two additional "static" information screens;
4 x PATA HDDs for OS & programs, swapfile & temp, project file sources, and guide audio;
Onboard Realtek ALC888 7.1 channel audio CODEC with High Definition audio;
Lite-On DVDRW LH-18A1P;
VIA OHCI Compliant IEEE 1394 Host Controller.
ASIO4ALL version 2.8;
Via Hyperion Drivers 5.16a - (VIA Chipsets INF Update Utility V3.00A, VIA PATA IDE Driver Package V1.90, VIA SATA IDE Driver Package V2.30A, AGP V4.60A);
Matrox PowerDesk-SE 11.10.400.03;
Matrox Millennium G550 Display Driver Version 5.99.005;
Realtek High Definition Audio System Software Version R1.91, Audio Driver Version 5.10.0.5605;
DirectX 9.0c March 2008;
Microsoft .NET frameworks 1.1, 2.0 and 3.0 with all service packs.

Live multitrack recordings drift out-of-sync with video

Similar Messages

Maybe you are looking for