Audio sync drifting when recording

Hi everyone,
Has anyone experienced something like this?
I'm recording a webcam. A Polycom CX5000. I have it set to record the encoded video and audio with a limit of 30 minutes (creates a new file). While doing the encoding, I get no notification of any dropped frames, yet when I play back the resulting .FLV file, the audio drifts out of sync in the first file after about three minutes. When the recording went over 30 minutes, FMLE started a second file and for some reason, the sync pops back on. Is there a bug in FMLE or some setting I can do to avoid this? I'm encoding on an i7 PC so I don't think it is a hardware issue. For encoding I was using 15fps, 640x480 and audio at mp3 224.
Thank you,
Mark

Hi,
Thanks for your response.
>1. Does the sync problem aggravates over time or does it remain constant from 3rd min to 30th min?
It aggrevated over time. You can't really notice it until around 3 minutes into the video. I watched it again and it looks like it the sync fluctuates slightly. Goes out of sync, gets back in sync (or nearly) and then goes out again. Listening on headphones I hear tiny, split second drops outs or glitches (related?).
>2. Did you observe the sync problem in the live stream also?
This time didn't even do a live stream. Had similar issue two weeks ago that was live stream and file save. Assumed the issue was due to network issues.
>3. Can you reduce the file split time to let's say 5 min and reproduce the problem again?
Will be trying this today or tomorrow.
>4. Which audio device are you using? Is the audio and video device coming from the same device?
It is from the same device (I think.) I am remotely troubleshooting for someone so I'm not 100%. It's a Polycom CX5000. The first one we have. We previously had a Microsoft Roundtable which is the same device. The device names come up differently though so that's why I'm not positive. The Video device is currently listed as Integrated Webcam (which must be correct as I'm getting the right picture). The audio though lists "Microphone Array (IDT High Def..." something.. That might be the laptop's built in microphone? If so, that might be the issue.
>5. If you have a different audio-video devices, please try with them and come back with the result.
Will let you know.
I'm hoping it is #4 as that would be an easy fix. I would find it hard to believe Adobe released a product that couldn't keep audio and video in sync, right?
Mark

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Audio sync lost when recording

I have another problem after the latest update (besides the applescript).
When recording a movie the sync between audio and picture is lost.
I use a canopus ADVC 110.
Using iMovie still maintains the video audio lock.
This update is just horrible, how could apple release this crap?
Henning

Hi,
Thanks for your response.
>1. Does the sync problem aggravates over time or does it remain constant from 3rd min to 30th min?
It aggrevated over time. You can't really notice it until around 3 minutes into the video. I watched it again and it looks like it the sync fluctuates slightly. Goes out of sync, gets back in sync (or nearly) and then goes out again. Listening on headphones I hear tiny, split second drops outs or glitches (related?).
>2. Did you observe the sync problem in the live stream also?
This time didn't even do a live stream. Had similar issue two weeks ago that was live stream and file save. Assumed the issue was due to network issues.
>3. Can you reduce the file split time to let's say 5 min and reproduce the problem again?
Will be trying this today or tomorrow.
>4. Which audio device are you using? Is the audio and video device coming from the same device?
It is from the same device (I think.) I am remotely troubleshooting for someone so I'm not 100%. It's a Polycom CX5000. The first one we have. We previously had a Microsoft Roundtable which is the same device. The device names come up differently though so that's why I'm not positive. The Video device is currently listed as Integrated Webcam (which must be correct as I'm getting the right picture). The audio though lists "Microphone Array (IDT High Def..." something.. That might be the laptop's built in microphone? If so, that might be the issue.
>5. If you have a different audio-video devices, please try with them and come back with the result.
Will let you know.
I'm hoping it is #4 as that would be an easy fix. I would find it hard to believe Adobe released a product that couldn't keep audio and video in sync, right?
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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?
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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!

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

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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...
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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

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I'm using Premiere Pro CS5.5 on a PC running Windows 7, 2.80GHz Intel Core i7 CPU, 6GB RAM, 64-bit OS.
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When I preview in my Premiere timeline the audio is synced but when I render out the clip the audio drifts so that it starts already out of sync by a frame or two and by the end it's clearly off by a lot. I'm not sure how to proceed since the audio looks more or less perfect in my timeline.
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Thanks

I'm definitely working with a mess of a project. Frame rates is actually one of the things I'm looking into and there are a number of discrepencies in settings between, raw footage (30fps from the 500d & 29.9 from the rebel), sequence (29.9fps) and export settings (59.9fps). Unfortunately in the overall project I'm working with video from a number of sources so I'm starting with a number of different frame rates (in other sequences I have captured video game footage that is 60fps too). I'm still going to try and match them up as best I can and hope it helps. I'm just worried that the destination for these rendered clips is a pre-existing After Effects project where all the comps are 59.9fps, if I try to change those and that causes problems I could be looking at a pretty huge set back right before my deadline.
To add a little more detail, the problem seems to be getting progressively worse. In early renders there was no sign of an issue, then yesterday during a review we noticed it was slightly off so I thought i fixed it did a render last night and when I checked it this morning it was as I described in the first post. I have at least 3 or 4 early renders where the problem was either not there or so slight it's hard to notice. The really weird thing I've discovered, if I put the rendered clip back in premiere it syncs up, but if I play it in quicktime or use it in After Effects (the next step in my workflow) it doesn't. Guess that could still have to do with frame rates. We'll see.
Thanks for the tip

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I have an audio track that was accidentally recorded at 44.1khz. I converted the audio to 48khz for import using Quicktime, but the sync drifts noticeably from the video after about 3 minutes. How do I correct this?

Make sure the sequence audio setting is 48K, not 32K.
If the audio was not recorded with video or with a TC based audio recorder, the likelyhood of drifting is quite high.
Options -
• You can cut and shift the audio in segments as the drift becomes noticeable.
• You can use STP to RETIME the segment to something that stays in sync.
I'm sure there are others ...
Good luck.
x

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I just got my video iPod and have been encoding some .avi's using Xilisoft. When I play the output as a .mp4 it's fine on my laptop, but when I play them on my iPod there's a distinct audio sync lapse that gets worse as the players goes. Many videos also freeze at 1:51 (even though the time indicator shows the whole file time).
Anyone else having this problem and found any solutions?
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having problem......................no solusion

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Currently using Premiere Pro CS3 3.2 and Quicktime 7.5.5
When I export to a quicktime .mov, my audio is a few frames out of sync. I've tried downgrading to older versions of quicktime with no success. Everything is completely in sync inside Premiere. If I import my rendered out-of-sync .mov back into Premiere, it magically syncs up fine again. It's the weirdest thing.
Help!

Scott:
There is a workaround.
I never really found a solid cause/solution, but if you're noticing that you have a couple of white frames at the end of your Quicktime exports, then you're probably suffering the same problem I have. Tech people I have checked with have suggested that the problem may be related to the use of .mp3 sound files (as opposed to .wav) in the Premiere project, but after removing them and replacing them with .wav's the problem persisted.
I am not technical enough to figure out exactly what's causing the problem, but I think it must have something to do with the Adobe Media Encoder (at least how it works on my computer). From what I've read on the subject, the Media Encoder is Premiere's Achilles's Heel.
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I'm not the only one with this issue, but searches of the Internet show it to be relatively rare, so it's probably some weird glitch somewhere deep in my system. It's not widely-reported enough for anyone to care about addressing this bug. Of the few people that I've found suffering from this anomaly, none have found a fix.
But the good news is that I have found a workaround that accomplishes getting a quicktime file out properly that does work for me. I avoid the Adobe Media Encoder completely.
Step 1: Go to File > Export > Movie, and under Settings > General choose QuickTime, under Video > Compressor choose H.264, then Uncompressed Audio. I have not experimented with other settings, but believe that most of them will do just fine.
If you examine the quicktime file you've just exported, you'll see it works just swell; i.e. no white frames at the end of the movie and the sound syncs up perfectly. Okay, sounds great---but there's no way to limit the data rate using this method, which means we're stuck with a ridiculously large file.
The solution is to load the Quicktime file that you've just exported into Quicktime Pro, and now export it using data rate compression / sound compression options to suit your tastes. Bingo!
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Having the same issue here. Some kind of solution would make me so happy right now.
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The only workaround I've come up with so far is as follows:
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Check you have the very latest version of QuickTime (7.7.1 at time of writing): QuickTime 7.7.1 for Windows
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Audio sync drifts w quicktime or mpeg-2 ac3 in quicktime or dvd studio pro

Sorry to post twice but question wasn't asked right so I posted again with the subject correct as I didn't know how to delete other that said audio drifted opening in compressor which isn't the case this is about audio drifting that is perfect in a final cut pro sequence, perfect when I look at a self contained quicktime made, but when I import into dvd studio pro even before making a dvd and just looking at the video and sound in tracks as assets, it's already drifting, and is still the same if I make a dvd:
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My audio is spot on for sync in final cut sequences.
When I make a quicktime self contained and open it in final cut it is also perfect.
If I open that same finished self contained file in quicktime or place it in dvdstudio pro, there's what looks like moments the picture is faster than the sound but not always....it is not a lot like maybe 5 frames or so sometimes worse at times...this project is 90 minutes...it occurs in and out throughout not just at the top or the end.
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hey team:
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Audio sync drifting when recording

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