Fixing audio sync without re-compressing

I wasn't sure which forum to post this in since this isn't really an iMovie question, but I figured this would be the best place.
I have an .avi file where the audio is a little bit out of sync. What I want to do is sync the audio back up and save the file to the exact same format it's in WITHOUT having to re-compress or re-encode it. There's a bunch of tools that can fix audio sync but when you want to save the file, it goes through compression. This file is already compressed and everyone knows you never put a file through compression twice.
If anyone has any idea what application would do this, I would be very grateful.

_Freighter_, I support your statement 100%.
I need to cut a documentary shot over 10 days for which I keyworded everything. Now I need to sync audio and I face the exact same issues as you and I don't know how to get started ...

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Fixing audio sync in iMovie

I imported a bunch of VHS tapes using a Digital8 camcorder to do the A-D conversion and Firewire to import the resulting DV stream into iMovie. The resulting video has an audio sync issue. The video is behind by a second or so. The delay seems consistent.
How can I use iMovie to fix the sync?

That is good to know, but I would like to fix the sync on the stuff that I have streamed in.
I would like to separate to audio from the video, offset the audio and glue them back together. How do I do that?
I tried using QuickTime to create separate streams, but iMovie would not let me import the audio.

9.0.2 update just released, fixing audio sync problems.

Just ran a quick test, looks like it's fixed! Thanks Apple!

It worked for me perfectly! That saves me a lot of frustration after putting a lot of time in editing a project. Great to see it export now and the audio is synced! Yeah! Thanks Apple!

I made a video of our summer vacation on imovie. It's over an hour long. When I try to share it, the audio syncs incorrectly at about the 15 minute mark and is off for the rest of the movie. Is there a way to fix this? I think I have imovie 09.

I made a video of our summer vacation on imovie. It's over an hour long. When I try to share it, the audio syncs incorrectly at about the 15 minute mark and is off for the rest of the movie. Is there a way to fix this? I think I have imovie 09 with all the availbable updates.

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Major "BUG" in Imovie 9 - Audio Sync Problem on Export !

Well I'm a hard-core Apple user from day one, but unfortunately today I'm not to proud about the latest version of Imovie 9.
It seems there has been a "MAJOR audio sync problem on export" in Imovie 9, since July 2009. Apple knows about this bug for a long time now, but didn't release any bugfix yet!
Here's what it's all about:
It seems if you use the (custom /manual) speed-adjustments and not the preset slider speeds, you will experience (after exporting your movie) annoying bursts of audio from clips that had been set to mude. The strange thing is that you will only experience this audio-bug after exporting, you will NOT experience it in the project playback mode!
Here's what you can do:
Find ALL the clips in your Project that are Speed Adjusted.
Instead of using a "Custom Speed" percentage, use any of the "Preset Speeds"
Preset Speeds on the Slider = 12.5%, 25%, 50%, 100%, 200%, 400%, 800%
Then, export your project as usual.
No more sync issues.
Really hope That Apple will come up with a real BUGFIX soon.
It's a shame that a major bug in a otherwise GREAT PRODUCT, hasen't been fixed yet!
What's wrong with Apple?...this is not one of their finest hours.
Still A BIG fan from Imovie HD,...I'll chance to Imovie 9 when the bugs are finaly fixed!

This is TERRIBLE! I have spent so much time working on this project, and I really don't want to adjust the speed settings to the preset levels, BECAUSE I need to motion of the video to match certain musical points. I can't re-film my video, and I needed this project done TODAY. I made a music video with some kids at summer camp, and today is the last day- the day we were supposed to all watch it together, and now, I've got NOTHING!!!! (Because I can't export it without all those glitches!)
I am MAJORLY DISAPPOINTED on this one. I've made movies in windows movie maker before, and purposely used imovie, because you know, everything on macs is supposed to be better. Well, I guess I was wrong.

Quicktime audio sync issues

Hello,
I have quicktime version 10 (128). I can't get anything to play in it without there being severe audio sync issues every time. I can't figure out why. Can someone please help me fix this problem?
When I export my movies from imovie to quicktime it will play in quicktime, properly and without sync issues, for a really short period of time - seconds. But after that, the audio no longer matches the video. I know it's an issue in QT because when I upload the video to YouTube there are no audio sync issues whatsoever.
Help?
Thank you so much,
YahYah

I am dissapointed to see that no one has addressed this issue. I have similar issues.
The MP4's play perfectly in the quicktime player but in Premiere they are off by varying degrees sometimes up to a minute even. I had similar problems in the past with files from the same producer. However last time I was able to change the extension before importing and then sync them up manually on the timeline. It worked everytime. This time however when I change the extension Premiere brings it in as an audio only file.

Audio sync issues with variable frame rates as well as .ts files

I'm using Premiere Pro CS6 and CC, in Windows 8.
I bought an AverMedia Live Gamer HD card to capture 1080p footage with, and the the videos it produces work perfectly during playback. No sync issues whatsoever. I'm saving them as MP4 at 30fps.
The problem is when I import them into Premiere Pro, the audio loses sync at certain points. After a bit of digging, I've discovered that the videos have a variable frame rate, which Premiere Pro does not support. I don't know why, considering competing products that are significantly cheaper can handle them with a problem, but oh well. The capture card can also save videos in .TS format, which produces a constant frame rate, however when I import them into Premire Pro the sync is immediately off by a second or more. I assume this is for an entirely different reason. Again, they play back normally without a problem. Upon emailing AverMedia, I was told this was Adobe's problem and there was nothing they could do about it.
What I'm wondering is if there is any sort of realistic solution to this as of now. Is there any way that Premiere can work properly with files that have a variable frame rate? If not, is this being worked on?
Or maybe there's a way to get the .TS files back in sync, that way the variable frame rate issue doesn't matter anyway.
Converting the files is not a long term solution. I'm working with hours and hours of HD video, and it would take way too much time to do this.
Manually resyncing the audio is also not a solution. Again, this would just be way too much wasted time with each project.
The only solution I see as of now is to switch to Sony Vegas until this problem is resolved in Premiere, if it ever is. I'm really hoping there is some other way, so if anyone has an idea as to how to fix this, I'd really appreciate it.
Thank you.
tl/dr:
Is there any way to get around Premiere Pro not working with variable framerates? My .TS files are also out of sync, is there any way to fix that? Without converting or manually resyncing.

>If not, is this being worked on?
Discussed many times before... never a "yes" answer to your question... tell Adobe what YOU want at https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
If enough people make a request, Adobe MAY add the feature (I don't work for Adobe, so no guarantee of anything)

Audio Sync Issue When Exporting to Quicktime

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.
Changing versions of Quicktime did nothing. Others trying to solve this problem have tried exporting their files with every conceivable variation of options and settings in the Adobe Media Encoder with no positive result.
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!
The other workaround that I have heard from some is to export your movie (again, avoiding the Adobe Media Encoder, instead using File > Export > Movie) as an Uncompressed AVI, and then compress with QT pro as before. This method didn't work for me, something about not having the proper codec on my system to read the AVI file that was exported, which makes absolutely zero sense but I couldn't find the right codec anywhere, even after identifying it with some super-duper codec identification utility. Go figure!
So, you'll have to get QT Pro ($30 I think) to use this workaround, but it does work, and that's what counts. I have no idea if there's a QT Pro clone or similar program available out there. Compression/decompression and all that jazz is way beyond me and I'm just happy to be able to get my file finally out there in working condition.
The only other bit of information I might share with you is that I tried searching the Internet at great length to try and solve this issue, but on the rare occasion I did find someone suffering this problem they were as confounded and frustrated as I was, and no one had a real solution. I continued to search with different search terms and tripped over the clues to this solution when searching for "white frame problem" in relation to Premiere. I even believe that if you search the Abobe forums you may find some posts about it, so if you're inclined to learn more about it, I suggest concentrating your searches with terms that refer to the white frame problem/issue, instead of the terms I used for so long, such as "Premiere Audio Sync Quicktime" and the endless permutations thereof.
But I'll bet this workaround works for you. Let me know, and if you'd like me to try it on one of your exports on my computer I'd be happy to give it a go.
I have often wondered if upgrading to CS4 would solve this problem. Are you using CS3 like me? If I could be sure CS4 made this issue vanish I would jump on it, but there just isn't enough information out there to know for sure. I'm inclined to think not.
Please do let me know if this solution works for you, or if you dig up any new information.
Thanks!

Problems with Audio Sync and Rendering

In both problems what happens is NOT consistent. If were, would think was a setting or something I was doing wrong.
About the rendering problem. I capture either through FCP Log and Capture or through my analog to digital "box", Formac Studio TVR. In both cases record in DV setting. When I then Import these files about 3 out of 4 times they need full rendering. But doing all things the same, there is that 1 out of 4th time where no rendering is needed at all. Does not seem to matter whether I capture through FCP or Foremac. Results seem the same. Like I said to begin with, if was consistent would figure that is just how the program is. But due to the time it takes to do a render, sure would be nice if could be avoided some way.
Regarding the Audio Sync. At times, maybe 1 out 10 times, the audio is bad. It begins at the beginning of the film being out of sync maybe two or three frames. But then every 10 minutes of film it progressively get's worse, losing a good 6 to 10 frames as one goes. I can fix by doing a lot of cutting and then moving the film around till it is in sync again, but as you can imagine takes a LOT of extra work. Any ideas as to why this is happening and what could be done to prevent in future??
Thanks in advance for any help you can provide.

I've used flip4mac for about a year and have had no problems with it. I mostly use it to export preview versions for windoze people. The quality is very good, though it takes significantly longer to export than a similar-quality quicktime movie.

HP Mediasmart TV recordings lose audio sync

I have a HP Dv5 1235dx laptop and I am using a Kworld UB435-Q usb tv tuner stick to watch and record free over-the-air hdtv.
My issue is that when I record a program with HP Mediasmart TV the audio loses sync with the video. It starts out ok, but gradually goes out of sync the longer you record, so that by the end of an hour long show the audio is about 2 seconds off which is extremely distracting bordering on unwatchable. I can record programs with Windows Media Center and it has no audio sync problems, but WMC doesn't pick up all the channels and doesn't have as nice of an interface and program guide as HP Mediasmart TV.
Does anyone else have this issue, or know of a fix for this? I've also noticed that the recording quality options are greyed out in the settings menu, so its not like I can even try a lower quality setting to see if it makes a difference.

jlewis wrote:
I just discovered the same problem.
I have an HP dv8t running Win 7 64-bit. Last night I recorded about 2 hours of a football game. When I watched it later the video and audio gradually moved farther & farther out of sync. On a football game, you rarely see people's lips when they are talking anyway. It did seem like the announcers were slow to react, though! If it was a regular TV show or a movie, I could not have watched it at all.
Another strange occurrence -- I first replayed the recorded video in HP's Mediasmart player. After about 45 min. the video started getting choppy. The audio remained smooth, but it seemed like the video was dropping frames. It got worse and worse until we were seeing 1 second (or more) jumps in video. I shut down HP's player and opened the video in Windows Media Player. It played fine -- at least the video did not skip. The audio was still out of sync by a second or two.
- Jeff

TS1456 My 4th Gen iPod Nano isn't displaying a "Use iTunes to restore" message, but iTunes is displaying a restore message when I connect it. I have original music that I can't back up on my iPod. Is there any way that I can fix the iPod without restoring

My 4th Gen iPod Nano isn't displaying a "Use iTunes to restore" message, but iTunes is displaying a restore message when I connect it. I have original music that I can't back up on my iPod. Is there any way that I can fix the iPod without restoring it?

It's not designed to work like this. When you sync, the iPod stores some information that basically says 'this iPod belongs to computer xyz'. Apple did this to prevent copyright issues (syncing someone else's music).
If you really want to do this, you'll have to at least tie both iTunes installations to the same account. Maybe have them sync with each other.

CS4 Audio Sync Issues After Render in Media Encoder

I'm editing a 6-part online promotional video right now using Adobe Premiere Pro CS4, using MPEG footage (MTS) imported from a Panasonic AG-HMC40 AVCCAM HD. Upon rendering each video to a Quicktime mov in Adobe Media Encoder, there's always at least one instance in each video where the audio is out of sync or there is a 1 to 2 second jitter in the video. Otherwise, the final product looks flawless.When viewed in the timeline, the video/audio mesh perfectly (although, if I keep re-playing the problem clips in the timeline, I can occassionally see some jitters). The same issues occur when rendering to H.264 Youtube Widescreen HD.
Anyone have any suggestions?
File Info:
Type: MPEG Movie
Image Size: 1280 x 720
Pixel Depth: 32
Frame Rate: 23.976
Source Audio Format: 48000 Hz - compressed - Stereo
Project Audio Format: 48000 Hz - 32 bit floating point - Stereo
Average Data Rate: 2.1 MB / second
Pixel Aspect Ratio: 1.0

No, there is no blacklisting here. Now, some might be a tad confused by "Render" in the title, but I'd expect them to read, and understand. I just pointed that out, to avoid confusion down the thread. I expected to read of a Render messing up the sync, but it became very clear exactly where your issue was occurring.
I wish that I had more to add, than a question on the H.264 CODEC, but have not encountered this myself. I'm only relying on what seems to have worked for others, and might not have any bearing on your issue.
Good luck,
Hunt

Is the audio sync bug (related to custom clip speeds) still present in iMovie 11?

Is the audio sync bug (related to custom clip speeds) still present in iMovie 11? I encountered it in 09 and was wondering if it was fixed in the latest version.

I haven't encoutered since iMovie '09.
You can always call Applecare as ask if there have been reports to engineering.
Calbe

Jittery HD Video in CS4 After Updates - Audio Sync Before Updates

I just got a new laptop, an Asus G73JW. I loaded up my Adobe Production Premium CS4 suite, opened a project in HDV 1080i setting, but the audio was out of sync. I checked it in WMP and it appeared fine. I did the Adobe updates and the audio sync issue was fixed, unfortunately, the video is now jittery and looks horrible. I would much rather have audio sync issues, as least I can fix that, even if tedious.
I am running Windows 7 64 bit OS and all updates are done in both Win 7 and Adobe. I captured the HDV in HDV Split and they are .m2t files.
Any ideas what the jittery video issues are? Any advice would be greatly appreciated.
Thank you in advance,
Aaron

Well this is ebarassing, but it works fine now after a reboot. I just had the OS reinstalled after corruption issues in the original install. I forgot to turn Windows auto update off this time and I didn't realize that Windows was updating in the background as I was working. It is turned off now, and I went through my settings more carefully.
I am editing HD with my new laptop now with no isues and it works great.
Sorry for he false alarm, and thank you for the help Bill.

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

Fixing audio sync without re-compressing

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