Drifting sync

We're importing long interview clips from P2 - 720/24p DVCPro HD and getting a strange sync drifting problem. The clips start out playing in sync and then over the course of a minute or two drift progressively more and more out of sync.
This happens both in the viewer or if we cut the clips into a sequence and play them there.
The really strange thing is that if we stop the sequence or the viewer and then hit play again, the clip jumps right back into sync.
Has anyone had any experience with this issue?
Thanks for any assistance!

Do not use ProRes HQ. It's overkill unless you are working with FILM not VIDEO. Just use ProRes 422. You will see this documented all over this forum. It was even discussed earlier today.
To the OP- A lot of people also use MPEG Streamclip (free download) to convert files to editing formats. Not that there is anything wrong with Compressor. I just want to point out another option.
What sample rate was the audio recorded in? 44.1khz or 48khz? If it's the former it would explain why your audio is drifting. Try using QT to convert to 48khz AIFF 16 Bit

Similar Messages

How do you fix the audio from drifting sync on DV footage?

I know there has been some discussion about this, but the solution doesn't really make sense. Basically, I am having a huge problem with audio sync on anything shot on MiniDV. Sometimes the footage will pop at the beginning and the footage will immediately be off sync --- sometimes it takes halfway through the tape to start drifting. We work with pro-level camcorders and recording decks, and basically the only solution I can find it use legacy FCP or iMovie to capture the footage. Which is not a solution. I've also tried the re-time fix, which *sometimes* works ------ but only sometimes. Is this being addressed in any way?

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Drifting sync with converted MP4 files

Hi there. I'm converting some MP4 files to .mov using AIC using slipstream so that I can edit the footage in FCP. I find that the sync is drifting very gradually within a few minutes. The sound is an aiff file recorded digitally at the time. Any idea what might cause this? Thanks. Should I use another codec?

Do not use ProRes HQ. It's overkill unless you are working with FILM not VIDEO. Just use ProRes 422. You will see this documented all over this forum. It was even discussed earlier today.
To the OP- A lot of people also use MPEG Streamclip (free download) to convert files to editing formats. Not that there is anything wrong with Compressor. I just want to point out another option.
What sample rate was the audio recorded in? 44.1khz or 48khz? If it's the former it would explain why your audio is drifting. Try using QT to convert to 48khz AIFF 16 Bit

Adobe Media Encoder CS4, converting mp4 to flv - seriously drifting sync

(Not sure this is the right forum for this - I didn't see a forum for AME but it's being used in conjunction with Flash)
I've been trying to convert a 2:54 mp4 to flv, and when I'm done, when playing the resulting flv it tells me it's now 3:37. Of course the audio runs out at 2:54 so I have half a minute of silence.
The mp4 was ripped from DVD using HandBrake.
I tried converting using a couple of different presets and keep getting the same result. I can't seem to locate any sort of "keep video locked to audio" option in AME CS4.
Maybe it's a frame rate issue? I'm not sure how to determine the frame rate of the original, but the DVD is a burn from the video house that produced the video - US format. So probably 29.97?
Help!
- Bob

Well that did work. Unfortunately Viddler turned the previously 16 x 9 video into 4 x 3. Not sure why - found a thread there where they suggest this could happen if exported from a Mac. My source was ripped from a DVD (though it may have originated on a Mac).
So now we're just linking to it on YouTube. Crappy solution but best I'm going to get under the circumstances.
Thanks for the suggestion.

Need to slide audio track on 3.0 to synch with video

I use PE 3.0. From a flash drive, I have captured a news segment from a broadcast TV station. I put it on the timeline to clean it up after which I then need to export to a DVD. The video and audio are out of synch by a few frames--"lip flap" as we used to call it in the biz.
I would like to drag the audio clip on the timeline just a few frames to the right or left to see if I can synch it, but when I try to drag the audio the video goes right with it. Any way to unlock the two? Thanks, Hank

Other than a bit of careful watching and listening, it should go well. I usually forget to turn Snap back on, until I wonder why my Clips don't, well Snap.
Obviously, this works with a constant OOS issue. If one has "drifting" sync problems, you can do this in several places. As an example, let's say that we have a 10 min. Clip. The sync is good in the first min., but starts to drift. At the last point where sync is good, Razor the Clip and apply the above technique. Note: it might be easiest to separate the Clips, just for working, in case one needs to move the Audio earlier (to the left). In a very few instances, where all of the Audio needed to be retained, I've added a 01 sec. Black Video, and done a Dip-to-Black on either side of it. Usually, however, if the Audio goes earlier (to the left), the preceeding Audio can be shortened to accommodate it, or that new Clip's Audio can be shortenend slightly.
One then proceeds to the next spot, where the sync has drifted noticeably and then they repeat.
Usually with file format OOS issues, it's constant. I had a few dozen Clips that were all OOS by exactly 12 frames. Drifting sync can be done, but as you see there are a few more consideratios and more work. Drifting is often caused by sample-rate differences between the source files' Audio and the NLE. That's one reason that I like to get my Audio at 48KHz 16-bit and my Video at DV-AVI Type II, before I Import.
Good luck,
Hunt

IDVD 08 audio/video sync drift toward end of DVD movie - fix/workaround?

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.
After a little Googling I came across some reports that iDVD might not deal well with video that's been recorded with 12-bit audio. I've confirmed that my camcorder is (was!) set to 12-bit rather than 16-bit (the default, I'm sure). So if that's the problem I'm hosed... it's not like I can get a retake on that footage
Is there a reasonable workaround for this issue? I'm obviously unable to re-take the video (or the other 10 hours of DV video tape I've yet to use in an iMovie project). Ideally I'd like Apple to release a patch for this. Shouldn't it be possible for iDVD to account for audio that was originally recorded in 12-bit... even if it's just a checkbox you have to select to tip it off?
Then again, perhaps this is totally unrelated to the 12-bit issue, and this is just a run of the mill bug?
As I said... iMovie generates a MPEG4 video file of the Movie that looks/sounds perfect, so it seems this sync issue's being created somewhere in iDVD as it's rendering the audio/video to burn to the DVD...
Thanks in advance.

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:
29.97 FPS H.264 Decoder, 960 x 540, Millions
AAC, Stereo (L R), 44.100 kHz
0:01:12:07.16 duration
The resampled and saved QT MOV file has the following properties:
29.97 FPS H.264 Decoder, 960 x 540, Millions
16-bit Integer (Little Endian), Stereo, 48.000 kHz
0:01:12:07.16 duration
BOTH versions of this Movie file play flawlessly within QT Pro... there's no audio sync drift evident toward the end of the movie unless I use iDVD 08 to burn either movie file to a Physical DVD (or DVD Disk Image). In both cases the resultant DVD Movie exhibits significant audio sync drift as the ~1hr 12 minute movie progresses. The sync goes out by ~ <= 1 second based on a rough visual assessment.
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 drift in Premiere CS5.5, but not in CS6

I have a QuickTime file with the following specs:
Video: H.264, 854x480, 29.99fps
Audio: AAC, 44100 Hz
When I open the file in QT player, or in Adobe Premiere CS6, there is no issue with Audio/Video sync.
However, when I import the file in Premiere CS 5.5, there is a drift in the Audio/Video sync.
Is there something I can do in Premiere CS 5.5 to avoid or fix the drift?
Thanks.

I had a similar problem and these are the steps I took to fix it.
First I deleted the files in "Adobe Premiere Pro Preview Files" for the project in question. I reopened Premiere and it appeared that deleting those files didn't seem to do anything as everything in the project looked the same.
I then disconnected the drive with the footage on it and opened Premiere. When it asked where the footage was, I told it to Offline All. I then went into Preferences > Media and hit Clean for the Media Cache Database. This had to be done because it only cleans the cache for files that are no longer connected with the project (as noted above). I closed and reopened the project, selected everything in the Project window, right clicked and chose Relink Media. I located one file and it relinked the rest automatically.
Now, finally, Premiere is re-conforming all the audio. Hooray!

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

Audio sync drifting

Log and capture files start out in sync and drift out of sync over the length of the clip. Could dissimilar Sequence, capture and device control presets cause this problem?
Seq Preset is set to DV50 48 Khz which has 16 bit 48 Khz audio
Capture Preset is set to AJA LH 525i29.97 DVCPro 50
Device Preset is set to AJA Kona LH NTSC Sony VTR which has a capture off set of -2 frames and a playback off set of +1 frame.
Audio Playback is set to built in playback with 2 ch of 24 bit 44.1 Khz.
Output to tape is AJA Kona 8 ch 24 bit, 48 Khz.
These dissimilar setting make no sense to me but that is how this system was set before I came into the picture.
Any insight would be greatly appreciated!!!
Thank you in advance for your help!!!
DKG

The editor and switcher/mixer are in different rooms but I could pull the audio into the bay if I have to but I really should be able to do this via SDI embedded.
I suggested this so that we could eliminate the deck and the process of embedding as the culprit. I understand that you don't want this as a permanent solution.
If I capture the same content that drifts from a DVCpro VTR that is fed with the same embedded SDI input everything is groovy.
So, if you record the material to tape and capture everything is good?
K

FINAL CUT PRO 5.1.4 Sync (Drifting) Issues shot with Canon XL2

So basically I am still having trouble with audio sync drifting and I captured the footage correctly using the 2:3:3:2 pull down 24p and 48khz. Any suggestions anyone else can give me? The last fella suggested that I should CHANGE the speed of the audio track to match up with the video track but I don't want a percentage of change in the way the audio sounds like even though it is very SMALL. Any suggestions I would very much appreciate. Thanks.

Butting in where might not be helpful…
The Canon DV and FW protocols are weird.
Here's what a buddy of mine has been doing for many years:
a. Place the long clip in the timeline.
b. Unlink the audio and video tracks in the timeline.
c. Select the audio clip and scrub till the end of the sound is reached. Hopefully this is eaisly matched to the video clip. Trim to that point.
d. Select the video clip and match the outpoint to the same frame of action (helps if there's a specific sound like a clap or a notebook being closed or someone's voice). Now choose Speed and wirte down the exact length of the clip.
e. Select the audio clip and choose Speed and enter the exact time of the video clip. Render.
f. Relink the two tracks which are now exactly the same length.
bogiesan

Anyone been able to sync slides with a single piece of music without drift

Been trying to sync 54 slides to 5 minute piece of music but have not been able to eleminate drift.
Has anyone?
Thanks
Jerry

I too had the sound synch problem....BUT came up with a perfect solution. I spent the money for a Quicktime Pro key. Then, export your Keynote program with all the automatic transitions, etc. as a QuickTime movie. Next, open it in QuickTime Player and also open your sound file in QuickTime. Do a Select All on your sound file and then Copy. Click on the Keynote QuickTime window and under Edit, choose Add Scaled. You can do it the reverse order too. Works flawlessly for me and has saved me many hours of frustration!

Audio sync drift issues within Premiere Pro CS6, even with 48kHz project & source material?

Evening guys and Merry Christmas to those who follow the tradition. I'm currently doing a few last minute tweaks to a live dance show that I recently shot. The show featured music that was recorded in camera (via additional mic) from the speaker setup within the theatre. This was always intended as a guide track as the original music would then be synced in the edit to give a cleaner sound to the audio during the dance sequences. I have the original CD that the music was played from on the night, however when the files are imported into Premiere Pro (or even Audition), they sync for the first 10 seconds or so and then gradually drift out of sync as the track goes on.
My project is set to 48.000 audio, which was what the original footage was shot at, as well as the audio tracks being imported as 48.000 too. Now on paper there should not be any issues with this sync drift occuring right? I've even tried with 44.100 audio files and naturally they drift out of sync.
At a loss here really as I'm not sure where i'm going wrong. Can anyone shed any light on this situation please?
Thanks!

What are you editing, and does your project match your video?
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
Report back with the codec details of your file, use the programs below... a screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30
For PC http://mediainfo.sourceforge.net/en or http://www.headbands.com/gspot/
For Mac http://mediainspector.massanti.com/
Please NOTE that the PPro CS6 screen may look a bit different (I use CS5)
For CS5 and later, the easy way to insure that your video and your project match
See 2nd post for picture of NEW ITEM process http://forums.adobe.com/thread/872666
-and a FAQ on sequence setting http://forums.adobe.com/message/3804341

Audio sync drift after "live" CD import and convert to 48/16

I shot DV footage on a PD150 cam. The band recorded a CD from sound board to replace the mic audio of the camera. I'm running Final Cut Pro 3, and I have already converted through Quicktime the CD tracks to aiff files running at 48 ( they were 44.1) and 16 bit. The DV cam Orignal audio was also recorded at 48/16. Now when I try to sync the Cd audio (48/16) to the video clips 1: the audio sync drifts off during the song, and though it started right, the whole sync is way off by end. 2: The audio file in the track bar is longer than the video clip in the track bar above. huh? Could it be data rate Audio 187kbps vs. Video 188kbps or should I try and slow/speed up the play rate of either vid or audio. Or is this an impossible meshing of media?
G4 Mac OS X (10.4.8)

As Jim says, it's a function of how this was done. Next time you will know to look for ways to avoid the issue. But all is not lost.
I'll give you the skeleton and you can figure it out.
Find exact sync points near the beginning and end of the "video audio" and the "CD audio". Use drum beats you can be sure are the same. Identify them by ear and then by their waveforms, and put clip (not timeline) markers at those points.
Sync up the ones near the beginning exactly. Now go to the other two, find out how far apart they are, and write it down. How? I haven't got all day.
Calculate the time between the 2 markers in the video clips's audio, and between the markers in the CD audio.
Translate both of those numbers into frames.
Calculate the percentage by which the audio is longer CD audio / video audio = X%.
Go into Soundtrack Pro or audio app of your choice and make a version of the CD audio that is sped up by X%.
Bring that back to FCP and replace the version on the timeline with it.
If the markers didn't survive, find the sync points in the new CD version. Line up at the beginning. If the ones near the end now match, everything is done and you can call me "Helpful" and "Solved". If not you can be angry at me or read it again.
Good luck!

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.

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

Drifting sync

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