Transitions cause audio/ video sync problem

Lets see if I can explain this one. Its certainly an odd problem.
I have an iMovie project, with around a couple hundred photos in it, and some short video clips. Im putting transitions in between everything.
At some point I noticed that, sometimes, I'll add a transition after a video clip, and then the last few seconds still have my audio from that clip but the video changes to a photo 2 photos later in the time line. Then it changes to the next photo after the clip.
Im using the latest iMovie HD, and Quicktime Pro 7.5.5, and Mac OS X 10.5.4.

Hi
I do like this:
• Select the video-clip
• goto Advance menu - select extract audio
• now apply transition
• adjust audio clip
Yours Bengt W

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Secondly, when I try to play the video in the source monitor, the audio plays but the video doesn’t; it only shows the first frame [this is after waiting until the video is ?recognized? ] I can use the shift-arrow key and see that the video is there.
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"I think you're telling me you're using a backwards compatible Digital8 camcorder to capture your video as DV-AVIs. Is that right?" YES
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alec

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Audio/video sync problem

I use a standalone home-theater type dvd recorder to make recordings. I don't know too much about the video editing world yet, I only know how to do what I need to do.
I had some problems opening my dvd files with PE7, so as per advice I received in these forums this is my process:
I copy the vob files to the hard drive, use a batch file to join them together, use streamclip to convert to avi format that PE7 reads. From there I do my PE7 editing. This has always worked well, until today the original recording was done a little different.
Usually, I have 1 recording session. Hit record, hit stop, finalize, done. But today, I made a mistake and hit stop too soon, so I started recording a 2nd session. I don't see why this should be a problem, but this is the only thing different that's happened today.
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The original dvd plays fine, it's only on the computer this is happening. What can I do?
thanks

Also, how do I fix this capture to make it right? The dvd I'm ripping from is good, but why is my ripping process not working as it always does? thanks
Unfortunately, I do not know the programs, or the processes that you used to rip the DVD.
My strongest recommendation would be to use a bridge device, to do the capture from the DVD player. I use a Turtle Beach, but would recommend the Canopus/Grass Valley. The biggest problem with going from a DVD to an editable file and then probably back to an edited DVD is that you end up with two MPEG-2 conversions. The quality hit is major, IMO.
Here is a ripping workflow, that might yield in-sync files, though dealing with MPEG-2 files often yields OOS issues.
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As MPEG-2 files often yield a myriad OOS issues, I refrain from using them and will convert all to DV-AVI Type II w/ 16-bit 48KHz PCM/WAV, prior to Import. I hate doing extra work and dynamic/drifting OOS is a lot of work.
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Help with Audio/Video Sync Problem

I have a couple of video Podcasts that I watch on my iPod (5.5G) and they work just fine on the iPod. However, when I watch them on my Vista machine the audio is not synchronized with the video. My machine is up-to-date when it comes to drivers and I'm not running any significant background processes.
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Does anyone know how to fix this?
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MikeMcCollister wrote:
I have a couple of video Podcasts that I watch on my iPod (5.5G) and they work just fine on the iPod. However, when I watch them on my Vista machine the audio is not synchronized with the video. My machine is up-to-date when it comes to drivers and I'm not running any significant background processes.
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I tried this already and then we had a blackout so going to try again and hope it goes through before a second one...lol
Hello:
Thank you Robert J. Johnston, the_wine_snob, Paul_LS and SteveGrisetti for your help so far.
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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.
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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...
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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...
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Audio/Video Synch Problem

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I have been bitten by the sync problem as well, and have spent most of this week trying to troubleshoot it. FYI, I've been doing video conversion and editing on PC's for years, but recently moved to OSX, a Datavideo DAC-100 (Firewire DV analog capture device) and the iLife tools.
And before anyone asks, I use 16 bit audio capture. I've verified this by looking at the file that are generated. I've also looked at all the iMovie sync FAQ's on the Internet. Audio sync problems and I are old enemies.
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While the video is in it's original DV file captured by iMovie, the audio sync is perfect. I've done a 3 hour capture, and the sync was fine all the way through.
When and where the sync goes bad is when the audio is extracted from the DV file, whether by manually extracting the audio in iMovie, converting the DV to another format (including another DV file), or 'sharing' the movie to iDVD. I belive this is because the DV file format tightly links the audio to the movie timeline. When the audio is extracted, it is associated to the video only by the length (in time) of the two files. And either the audio is slightly time compressed, or the video is slightly time expanded. I suspect the audio is slightly time compressed.
I've created a predictable test case with my video, where i can capture a 15 minute block of video. At the end of the file the audio sync is perfect while in the DV format , and is ahead of the video by about 1.5 seconds after extracted.
A simple workaround would be to use a sound or video editing package that allows you chop the audio when it goes silent and to stretch the remaining audio to match the length of the video. VirtualDub and CoolEdit for the PC used to be able to do this. I've tried doing this with Quicktime Pro with no success, though. I'll keep looking for a decent OSX program to try to do this with.
This does, however, only work around the problem, not identify where it is, or fix it.
I think I've also determined that this is a problem in the standard OSX DV stream capture API, not in the conversion process of Quicktime from DV audio to whatever.
I used BTV Pro (http://www.bensoftware.com/), a shareware/capture tool that can handle DV streams on my test case. The results were EXACTLY the same as under iMovie. I believe that BTV uses OSX's standard APIs for accessing DV streams from firewire.
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This leads me to believe that it's a problem with either the DAC-100's DV streams (which is set to the OSX dip switch settings) or OSX's DV capture API.
I then installed Avid Free DV (http://www.avid.com/freedv/index.asp), a free stripped down version of a high end OSX video editing package, and successfully captured the 15 minute test case, exported it to a DV file (using both the AVID and Apple DV codecs), imported the resulting DV file into iMovie, and extracted the audio. The extracted audio synced perfectly with the video in iMovie at this point.
Just to make sure that Avid didn't just 'fix' a bad DV file, I did another test capture from iMovie, and imported the file into Avid Free DV. The resulting video had the expected sync problem, which was expected since Avid uses Quicktime for importing and exporting video.
This points the problem squarely at the Apple capture APIs, as I believe that AVID uses its own. For some reason, the files generated by iMovie/BTV exhibit the sync problems when the audio is extracted in all cases, while files generated by Avid Free DV do not.
I still don't know what the issue is with OSX/iMovie and my DAC-100. I also know that not all DAC-100 users have the problem, nor do all iMovie users with their equipment. This could be a codec incompatibility with the version of firmware on the DAC-100 with OSX, a bug in the cap

Transitions cause audio/ video sync problem

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