Why do my audio files constantly corrupt and slip out of sync?

Whether using .caf or .aif (no MP3 audio), I get this strange issue were audio is randomly slipping out of sync. If I use the slip tool to scrub the audio track, I can usually hear an audible digital hit in the file. For example, I placed an explosion sound effect in the timeline and it plays back fine... then one time I'll notice the explosion is missing, but the media is still in the timeline. Level is up. Track is on. If I scrub the piece of media, I may find the explosion at a later point in the audio as if copy pasted there... or I'll hear some digital hits that sound like something has been corrupted... but at the originally intended "in" point, the explosion has simply "moved." Happens with pieces of music,too. I'll time something to a flourish and the flourish is missing at some point down the road and I have to do a matchframe overcut to get a new render that matches what I originally intended. Also have to remember to copy any effects/levels and paste to the newly overcut audio. A royal pain.
Only temporary solution has been to trash all audio renders and re-render the entire sequence. Not a permanent fix as the problem appears again and again. It's really frustrating (and scary) because I now no longer trust that all my audio is playing as intended without first dumping all audio render files and re-rendering. Any ideas?
Thanks,
-A

Thanks for your reply... no, there doesn't seem to be any consistent number of frames skipped. Random pieces of audio simply simply decide to play audio from elswhere in the media. Clicking on the waveform reveals a clear glitch of some kind... it's as if someone scrambled the media, chunks of audio in the wrong place, etc. If I go to the original media in the bin and double-click, it plays fine. I matchframe/overcut re-render) and it usually fixes it, temporaririly or for good. Sometimes I have to dump ALL renders and re-render the whole sequence. It's driving me nuts.
I should explain that I am using up to 30 audio tracks at a time. My machine can handle it fine, but I guess this complexity is causing problems? The reality is, even if all audio was 48khz, there would still be a need to render because of all the layers...
I guess I should start by replacing all 44.1 khz audio with 48.1k audio and see if that fixes it...

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The only way I can get the audio to sync is to render out a whole movie again and just use the sound from it, then it is in sync with my original.
Any one know what is up?
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Hi JohnDoe2009 - firstly, extracting the audio is not necessary in your case. Simply mute the video's audio, by reducing its level to zero - that is what actually happens when you extract the audio, after all.
It is my experience also, that locking audio clips to particular video clips is not fail-safe if further cropping is done afterwards, especially if that cropping is fairly substantial. Where possible, do the syncing after all crop-editing has been completed.
As a last check I always review the syncing before finalising the movie.

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After many years I've finally decided to transfer my old 4 track demos from cassette to my Mac.
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For some reason, the different sets play at different speeds. So if everything is at sync at the beginning of the song, they're well out of beat 90 seconds later.
How can I speed up or slow down a single track? All of the data is in GB, so it's hard to get out.
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Export each track as a separate AIFF file.
Open both tracks in AmadeusPro. Copy and paste into a new file with two tracks.
Select one track and use Effects>Change Pitch and Speed. This will provide incremental adjustments till both waveforms match up. But remember, you need to adjust both pitch AND speed together to reproduce a mechanical speed difference.
Once you have both tracks running in sync, use this opportunity to separate your two tracks into four by selecting Sound>Split Track. Now you have 4 separate tracks that are now in sync.
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Nightmare with repaired AUDIO slipping out of sync ???

I have a concert shot on Sony camcorders 48Khz, and audio recorded to LOGIC PRO 44.1 Khz
My workflow is roughly this:
1. Log and Transfer footage into FCP.
2. Arrange the clips into a rough edit on the timeline.
3. Export the camera audio from FCP, as it is on the timeline. ( to 44.1 AIFF file)
4. Sync up the good audio in LOGIC PRO to the camera audio track.
5. Bounce the good audio in LOGIC PRO ( to Both 44.1 and 48 AIFF files).
6. Reimport the good audio track into Final Cut Pro, to replace the camera audio.
Logic is working in 44.1 as that what the multi-tracks were recorded in...
I tried importing the 44.1 and the 48 and both do the same
Theoretically, this should sync everything, lThe problem is the "good" audio from the Logic slowly slips out of sync with the camera audio.
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the Wave form is looking correct and all in sync
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K

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greetings!
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s,
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All
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"jsc.19" wrote in message news:f9aaa05d-ad62-4f0e-96e1-6bbeb4c7098d...
> Will, thanks for taking the time to post some suggestions. I understand
> Protected View perfectly well and my post is because Protected View is not
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> thanks for taking the time to post. I think Tony is more on track with
> his questions around what has changed in my build, and this is the area
> I've focused on over the few days since posting.
>
> I've pulled my build apart and put it back together and found the issue.
> This was tedious to say the least, but turned out worthwhile. A program
> we used called Trim Context Desktop
> (http://h71028.www7.hp.com/enterprise/w1/en/software/information-management-trim.html)
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>
> Uninstalling Trim also fixes and issue I had in Outlook where the
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> previewers were not installed.
>
> We will go to HP to get some support and advice around this before putting
> Trim back in to the SOE.
>
> Anyone - if you have similar problems, can I suggest you look at all your
> Office add-ins and also any applications that may potentially hook in to
> Office.
>
> Cheers all.
>
> James.
>
>
>
Enjoy,
Tony
www.WordArticles.com

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It's recommended to download and install
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