Sync Issues (Audio / Video)

Like many others, apparently, I've spent untold hours putting together a ~50 minute project in iMovie '09, only to find that after exporting to iDVD, I lose sync. It's frustrating, but I've seen from this and other forums that it happens, and is related to using source material that is not 16 bit audio. In this case, my sources include horrible camera phone video, some video out of point and shoot still cameras, decent DV footage, and some high def out of a Canon 5D Mark II. So fair enough, but some questions about how to get out of this jam :
1. If I go through the clips in the project and look at them in Finder, or QT, or VLC, I can sometimes tell whether they are 16 bit, 8 bit, or whatever. But sometimes it just doesn't say. So I'd be grateful to learn how to tell for sure.
2. Once I've figured out which clips are not 16 bit, how can I make them so? Can I open those clips in QuickTime or VLC, for example, and export them out in another format that will not cause the audio sync issue? Is Garage Band of any help here?
3. Once I've turned everything into 16 bit audio, will it be sufficient to replace the offending events in the Event Library and then in the Project, or is that Project now irretrievably tainted with the other audio forms?
4. Is there a better way than what I'm suggesting in 2 and 3, above? For example, can/should I copy parts of the project into new projects, export them out in certain formats (which ones?) and then try to reassemble those exports into yet another new project in iMovie?
5. I do not have iMovie '06, and do not have access to it. But if I did, what would I do with it to make this better?
I do have Final Cut Express, but I don't really have the stomach (or more importantly, the time) for rebuilding this project from scratch. But if you tell me that's the only way out, I guess I'd do it.
Many thanks in advance for your help.

In case anyone comes across this in the future, I've resolved my issue, and it had nothing to do with audio bit rates. In short, there seems to be a well-documented yet unfixed but in which an export from iMovie can lose sync if there are either slow-motion effects applied to a clip, or if the slow-motion speed is custom rather than pre-set by the software.
I changed my clips to 100% and everything exported fine, with no sync issues. For more on this, see the helpful thread here: http://discussions.apple.com/thread.jspa?messageID=10618532#10618532

Similar Messages

Audio Slipping (Sync issues) steaming video.

Hey all,
I was wondering if this had happened to anyone else.
Since updating to Yosemite i've noticed a real problem when streaming video online through my web browser.
Regularly whilst watching a video there is a crackle on the audio track, then a second of the audio is repeated almost like an echo.
When this happens however the video caries on meaning the audio and video are out of sync.
This occurs on everything from Netflix, Youtube, DA Clips and other video sharing sites.
It occurs on Google Chrome, Safari and Firefox.
The only way to fix the problem and re-sync the audio is to reload the page with the video and begin again.
Unsure whether this is related or not but i've also noticed some slipping of audio when playing music in spotify. But obviously because it has nothing to sync up to you just hear the same word twice and it carries on, kinda like a scratch on an LP.
Would really appreciate any words of wisdom.
I'm currently running OS X Yosemite 10.10.1
Macbook 13inch late 2009 model
2.26 processor
4GB Memory
Many thanks
josh

In case anyone comes across this in the future, I've resolved my issue, and it had nothing to do with audio bit rates. In short, there seems to be a well-documented yet unfixed but in which an export from iMovie can lose sync if there are either slow-motion effects applied to a clip, or if the slow-motion speed is custom rather than pre-set by the software.
I changed my clips to 100% and everything exported fine, with no sync issues. For more on this, see the helpful thread here: http://discussions.apple.com/thread.jspa?messageID=10618532#10618532

IPad 3 audio sync issue when video imported into CS5.5

Hi everyone, long time lurker here, love the support you guys are giving!
I'm hoping you'll be able to help with an audio sync problem I'm experiencing with videos recorded with the latest iPad 3 (well, that's what I'm calling it anyway).
I believe the iPad 3 recording format is 1080/30p with 44.1Khz / 16 bit audio, but when I match those settings on a Premiere Pro CS5.5 project (or try 48KHz audio as a test), the audio gradually goes out of sync. If the video is several minutes long, it becomes quite obvious, and by 10 minutes, it's terrible!
I should add the file plays back fine on the iPad itself and was imported to a Mac via iTunes. It also plays fine on the Mac itself in Quicktime.
Does anyone have any suggestions on project settings that'd work?
On a related note, I additionally captured the audio using a Zoom H2n which i intended to replace in Premiere, but foolishly I captured it at 48KHz, rather than the 44.1KHz of the iPad video file. Should I resample it?
I actually managed to line-up the 48 and 44.1KHz waveforms from the iPad and Zoom in Premiere quite accurately, but again both gradually go out of sync with the video...
I'm running Premiere Pro 5.5.2 on Mac OSX 10.7.3.
Any suggestions greatly appreciated!
Gordon Laing

To update my original post, I have found this problem happens about half the time.
Sometimes there's no issue and the audio is in sync when imported into Premiere, but at other times it's way off.
I did however find a workaround which has resolved the problem on my iPad3 videos which were out of sync and that was to first import the video clip into iMovie on the Mac first, then simply export it again using the 1080p option. The subsequent file is much larger (so there's been an annoying re-encode), but when imported into Premiere, the audio is at least now in sync.
I used this to fix the audio on a couple of the videos you can find on this page (all of which apart from the last one were filmed on the iPad3)
http://www.cameralabs.com/features/Working_holiday/
Since the video wasn't exactly critical to start with, I'm not too bothered by the re-encode.
Let me know if this fix works for anyone, and also if anyone comes up with a different solution.
Thanks,
Gordon

Import issues, Audio/video Unsynced

Having major import issues, audio and video won't play in sync. Working with MP4 and MXF on most recent version of Premiere CC. Everything plays fine in quicktime/vlc but goest haywire in premiere. Have been through tech support twice, updated drivers, cleared cache and Premiere still has trouble playing back video/audio in sync. Any idea what's going one? Our company recently switched to adobe for the supposed "ease" it handles different codecs and so far have had nothing but issues? Sorry if this is already addressed in one of the forms, am at my witts end now having lost multiple days trying to troubleshoot premiere.

Hi Adobe4,
Having major import issues, audio and video won't play in sync. Working with MP4 and MXF on most recent version of Premiere CC.
Sorry for this issue. Tell me, where did these files originate? From a video camera? Do they have a constant frame rate or a variable frame rate?
Thanks,
Kevin

Sync issues when video project is uploaded to Facebook, but fine elsewhere

I have posted multiple video clips to Facebook without any issues. I've just finished two large projects, one is 5 minutes, the other is 7. Both are uploaded to my MobileMe gallery and play fine. I can play the finalized movies (m4v files) in iTunes and no issues there either. However, when I upload the mv4 file to Facebook, the audio and video get out of sync. The movie starts playing fine, and then there will be little pops and crackles every so often, and it will be noticeably out of sync about 40 seconds in. (I don't get these same crackles when I play the movie from MobileMe gallery). If I click ahead in the progress bar below, it syncs back up again, only to go out of sync again the longer it plays. The audio gets progressively more and more ahead of the video the longer I let it play. I've tried both exporting the movie as the m4v file and uploading it to FB, and also trying the feature that lets me upload directly to my FB account from iMovie. Same problem each time. I tried both the Medium and Large sized files too. Any help would be much appreciated.

It sounds like it may have to do with the resolution of the video that you produced in iMovie. Check the resolution of the video and see if they have any requirements for video clip resolution on Facebook and youtube.
I have uploaded video from iMovie to both in the past and they worked... so it might be the settings you have for the iMovie file.

Sync separate audio & video files at different TC rates

I have Quicktime files of footage shot in DVCPRO HD at 720/60p (60 frames). I have audio recorded as wave files (30 frames). Unfortunatly, most the timecodes don't match. So, I have to visibly match up the mark by revealing the waveforms. But, sometimes they are off due to the diff. frame rates they were recorded at, so they're half a frame off.
How can I get them to match perfectly in the shortest amount of time? (I have hundreds of clips to match up, time is money)
~reicko

Yeah, it is pretty close. And I'm also the audio mixer.... any tips?
Figured you might be one...being able to spot half a frame off sync. Sorry, I am not an audio mixer...so I don't. This is something that would be handled in the audio mixing software, like protools or Logic. BUT, for the way to do it in FCP, go here:
http://proappstuff.com/proapptipsvideotutorials/879F6B61-CFF9-4FD1-8D43-FDF89605 611A/BE5CA6A0-2D41-4F89-955C-16A05AC2A383.html
Once it's finished though, I need to do a pulldown to SD. Do I need a Kona, I see you have one, or can FCP hanlde this? Output too....what format of SD? DV? Beta? Digibeta? DV50? What? If to a format that can be output to via firewire (DV, DV50) then no, you can downconvert in FCP by dropping the finished cut into a DV or DV50 sequence and rendering, then outputting. But for Beta or Digibeta, you need an HD capture card. Decklink cards are another option...but I love my Kona.
Actually, this is my first HD edit and have a few more questions and would love to pick your brain if possible.
This site is for solving problems with FCP. For workflow advice you need to contact me offsite...and i charge for my consulting fees.
[email protected]
Shane

Audio Sync Issues Final Cut Express 3.0

I'm running an older version of FCE 3.0 I am having sync issues (audio slower than the video) when importing from my camera (small Panasonic handycam).
Does anyone have a solution?
thanks

Sync problems are often caused by using the wrong Easy Setup.
Cameras can shoot audio in either 12bit or 16bit mode.
The standard Easy Setup of "DV - PAL" (or NTSC) is for 16bit audio.
If you shoot 12bit audio your easy setup must contain "32kHz".

PE3 - Audio & Video out of synch on imported VOB files

I have tried adding some footage imported from DVD & is saved in a folder on the PC (by the PE process).
The file is stored as VOB 1 & VOB 2. When I import this file into the PE project the first half plays OK. When it plays onto the second file, the audio is lagging behind the video by a considerable amount.
If I view the file separately (where it is stored) with Windows Media Player, it plays back fine.
When I view the file in PE in the preview window, the out of synch fault occurs.
Something is happening in the import process to the PE project.
Anyone, have any ideas on the problem?

Here is a reply that I posted to a past thread that will give you options for fixing the Out-of-Sync issues when trying to use VOB files within PE.
In all cases it is better to not import VOB directly to PE, but convert to DV-AVI via one of these methods and then use the AVI format.
The last bullet below sends you to a Muvipix link describing how to combine multiple VOB's from one disc to a single file, this will cure the Sync problem, then convert this file to DV-AVI for import to PE:
I take the min-DVD directly from camcorder to my PC, and capture the disk via Power Director.
PD will convert the VOB's directly to DV-AVI Type 2 on one pass.
I then load this DV-AVI into PE7.
(PD v7 was pre-installed on my new PC from HP, or it can be purchased from Cyberlink).
Other options to try:
Copy the VOB's directly from the mini-DVD to your PC and use Prism to convert these to AVI.
Prism is a free convert utility and can be found here:
http://forums.adobe.com/thread/415317?tstart=0
Or load the VOB or Mpeg into PE, then use that to convert to AVI.
(Export to DV-AVI with PE8 is done with SHARE/PC, not Export under the File Menu, which is greyed out).
I've had many issues trying to work with Mpeg's and VOB's when loaded directly to PE with limited success.
So if you can get it converted successfully to AVI outside of PE, I've found this to be a better approach.
Post results, if any of this works for you...
Note: One other thing, if you are working directly with VOB's to PE, especially multiple VOB's from a single DVD, you can encounter out-of-sync issues between video and audio. If this occurs, review this link from Muvipix:
http://muvipix.com/phpBB3/viewtopic.php?f=38&t=2469:

Audio / video sync issue in playback

for every recording i've made, when i play back the archive there is noticable lack of sync between the audio and the person's mouth. the video seems to lag behind by almost a second. the good news at least is that the delta is constant.
has anyone else experienced this? it's happening in any scendario i try, even if i'm just recording myself.
is the LCCS dev team aware of this? since audio and video streams are recorded separately, is there any way for me to programatically 'nudge' the streams into sync?
it's currently a show stopper, it looks really bad when the sync is so obviously absent.

finally getting back to this..
i did as you suggested and recorded a video of myself using the recording and playback examples provided with the SDK (the 2.2 newest version btw).
the de-syncing of audio and video is definitely there. it seems especially bad for longer recordings. however, an interesting thing i discovered in playback:
- sometimes, if i drag the playhead somewhere in the recording, pause, and then hit play, video and audio fall into sync.
- if i start playback from the beginning of the recording, audio/video is always out of sync.
i understand that the video and audio streams are recorded separately and thus played back separately. my guess is that when those streams are retrieved and playback begins, one starts before/after the other because they're not retrieved at exactly the same time. it seems some extra work is required to ensure that their playback commences at exactly the same timestamp within each stream.
i can provide my recordings as an example if required.
this is a total showstopper for me. it renders the entire recording service useless if the playback can't have sync between audio and video. i would be happy to help with testing this more. can someone from the LCCS team comment on this issue?
thanks
adam

Premiere Pro audio sync issues with 48khz audio on video file and 44.1khz audio on external audio

So, I recorded video and audio on my Canon 5D Mark II at 1080p, 23.976 fps, and 48khz, 16-bit Stereo audio. And I used a Zoom H4 to record an mp3 audio file at 44.1khz Compressed. When trying to sync the audio in Premiere Pro CC, the audio slowly loses sync over time. I already tried to convert the 44.1khz mp3 file to 48khz in Adobe Audition. But that didn't fix the problem. Any ideas?

There's always time-stretch changes to the audio file with "keep pitch unchanged" checked, I suppose. Mind you, I've heard of people doing it but haven't done it myself. There's other possible options I'm sure. There's been quite a few threads here on time-sync issues over time.

Playback pauses and audio sync issues with live video stream

I'm seeing playback pauses about every three seconds and audio sync issues with our live demo stream when using the OSMF/Strobe player. It happens on both our 2Mbps 720p stream and our 480p 750Kbps stream so it does not seem to be related to higher resolution/bandwidth streams. It also happens if I point directly to a stream asset or if I point to a .f4v with both streams listed for dynamic so it does not seem to be related to dynamic streaming specifically.
The same live streams play back very well without pauses or audio sync issues in the Akamai's dynamic player and even slightly better with JW 5.2.
I have viewed the OSMF/Strobe playback on three different laptops of various age (3 months to 2 years) and two are Windows and one is Linux. I have also tried the various buffering options on the Flash Media Player Setup and Strobe setup and it has not made a noticeable difference.
To see the stream with the Akamai player, go to: http://live.kulabyte.com
To see the stream with the OSMF/Strobe player, go to: http://live.kulabyte.com/osmf
I do not have JW set up for public viewing yet, but the two above show the distinct difference.
We are really hoping to start pointing our customers towards the OSMF player because of the support provided by the community and Adobe, but we have to get the quality of the playback to be acceptable first.
If someone has ideas on debugging I can PM the actual video assets to you.
Thanks,
Tim

Hi Tim,
You need to add this setting:
dynamicStreamBufferTime=8
The actual value can be higher or lower. The best practice is to use a value that is twice the keyframe distance. Anyway, try different values and see which performs the best for your content.
I know that the setup page does not contain this option and it is not documented in the UserGuide. We simply missed it. Sorry.
Also note that the dynamic buffering algorithms are not being used for dynamic streaming content. I tried to explain this here:
https://sourceforge.net/adobe/smp/wiki/Dynamic%20Buffering/
Looking forward to your confirmation that this solved your issue.
-Andrian

Audio/Video sync issues after exporting

Two quick issues:
1. I've recently exported a project from FCE4 to quicktime and am finding that the audio is slightly out of sync with the video everytime.
Is there an ideal format or setting I need to export at to avoid this?
2. Also, I've edited two projects using the same clips and keep finding that the second one I make seems to make the video very narrow when I export it. Is there a setting I need to use to avoid this, or does the problem lay in the setup?
Cheers!
John

From what I see in your info, the clips don't match the Sequeunce.
Furthermore, the clips are not FCE freindly. Probably required rendering?
I'd suggest using Streamclip to convert the H.264 clips to the exact specs of one of the FCE>Easy Setups, audio and video properties, then start over.
http://www.squared5.com/
BTW: Whatever you convert the clips to must match the Easy Setup, so that you work with Clips and Sequence being the same. The best way to acheive this is to start a NEW Project, set the Easy Setup first, then bring in the the matching clips.
Using Item Properties in Browser>Seqeunce/Clip is one way to confirm matching specs for both.
Al

Why does embedded video cause audio sync issues?

Greetings all,
   I have a question that is perhaps best answered by an Adobe developer or someone who knows the SWF file format and various audio/video standards fairly well. When one drags an FLV file into the library in flash authoring tool, a window appears. If you click "Embed FLV in SWF and play on timeline", an awful message appears, "WARNING: Embedded video is likely to cause audio synchronization issues...". My question is: why would there be any audio synchronization issue? Is this really just a bug/unimplemented feature? Or is there some fundamental shortcoming of current versions of the SWF file format that does not allow for the FLV audio/video signals to be properly encoded in the SWF file? Or is it that the flash player plays SWF and FLV data in fundamentally different ways and that even if the audio/video is perfected sync'd in the SWF file, the fact that it's a SWF file causes flash player to lose sync?
   I'm guessing only a Flash developer could answer this (and probably not just any Flash developer!), so if there are any out there, please spare some wisdom for a poor lost SWF surfer.
   Thanks!

Hi:
Welcome to discussions!
From what I am reading, you are trying to use the audio that was in the original video-right? By that, I mean, you haven't added a voice over or music-just using the speaker's voice on the tape.
If so, you might want to try using something like a Fade Out or Fade In instead of one of the transitions that add or subtract to the length of the video
[Quoted from iMovie Help]
Some transitions (for example, Cross Dissolve and Push) shorten your movie by a few seconds, depending on the speed of the transition. For example, if you add a transition with a speed of 2 seconds, iMovie overlaps 2 seconds from the first clip and 2 seconds from the second clip as it renders the transition. This shortens your movie by a total of 2 seconds.
The Overlap transition freezes the last frame of the clip on its left and superimposes it over the next clip. Fade In/Fade Out blackens the last frames of the clip on the left and the first frames of the following clip.
[End quote]
Or you could try extracting the audio from the movie so that you could edit it and sync it that way.
Sue

Why Wont Apple Fix AUDIO / VIDEO Sync Issues

This has been a problem for awhile. Thank god there is a application fix but im receiving an iTouch very soon and I'm not sure if the same problem is going to be on that to..
It might be how Quicktime reads .MP4 and .M4V Files but i can play the videos on VLC and Zune Software fine..
I see other people posting this exact same problems. I see no answers... Apple Knows this is an issue. Why wont they fix it.
From what im hearing it is the audio that is going out of sync from the video.
Now my Final Question is
"Is this just a Software issue for the computers or is it also a Software issue (Assuming that quicktime is the software on these devices) for the iTouch / iPhone ?

well i got my itouch today and it seems that the audio and video sync issues are only on the computer distributions of quicktime and not the hand held device versions

Audio / Video Syncing Issues

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.
I have also tried breaking down the movie and exporting it in sections but the audio is still not syncing correctly on the export.
Please can someone help me out and help me explore my options.
Thanks in Advance,
Mauricio

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.
Good luck,
Hunt

Sync Issues (Audio / Video)

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