Out of sync audio file with video

I have a audio clip that was recorded seperatly from video. I add the audio track which is voice to the video that I have of a person giving speach. I line them up where speach begins and is in sync but say 10 mins into it the clips are out of sync! They should both be in the same time but they are not, how do I fix this?

Once you've determined answers to David's queries,
you will have a better idea of ways to fix
this...i.e. if the audio rates are not aiff and
exactly 48.0Khz/16bit, you could export the audio
into a new file with those parameters and replace
current audio with this file.
Actually, I tried that last night as well after reading this forum. I sent the good audio (aif) to SoundTrack Pro and resampled the file at 48khz to match the sequence settings. Unforunately, this still did not fix the problem.
I also looked at changing the base timing rate from 29.97fps to 30, but I coudn't see a way to change this. I tried changing it from the Advanced settings from the Sequence Settings Dialog, and I can change to 30, but it then gives an error message that it cannot do that.
The idea of a speed change is one I hadn't thought of, but I am doubtful of the results. I seem to be either stuck with bad audio or arduously cutting up the audio every 5 minutes to get it back in sync at those intervals.... I wish I understood why this is happening. It doens't make sense to me.
I still think it has to do with drop frame/non-drop frame, since I was told the whole point of 29.97fps was t solve an audio sync problem. When the audio isn't coming from a video source recorded or captured at 29.97fps then we are going to have sync problems. The question is, now to get it back into sync with these external audio source files, without a lot of headache.

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Work flow for syncing separate Audio files with Video files in FCP

It may be too late for me to use this workflow that I want with my current project, but I need to figure out what it is anyway for future reference.
Right now I'm editing a movie which is near completion. When we recorded the movie, the camera's deck recorded reference audio from the sound guy at 48k @ 16bit. This audio also went through an additional set of preamps which added a small amount of noise. So we don't want to use the reference audio because of it's low resolution and less clean audio. The sound guy recorded straight to his deck at 48k @ 24bit, besides the better resolution, his audio is noticeably better.
The camera deck and 'clapper' (I think that's what you call it) were not connected or synced. So the video files and the soundsguy's audio files are slightly different lengths, but at least have a 'clap sound' to manually sync to. And I don't mean that the audio and video files won't play in sync with each other, I mean that the soundguy always started recording before the camera, so his audio files have slightly different start and stop times.
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My current workflow right now is I have my finished sequence, I change the bit rate to 24 in Sequence Settings, and start manually dragging the soundguy's files to the sequence for every little edited clip. This is going to take forever, there are 99 scenes in this movie. Anyway, at the end of the day these sequences are exported as .omf files and imported into Pro Tools for audio post production.
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The normal workflow (besides manually syncing up before editing!)
is to have ' some ' way of auto syncing the clips.
So you must have common timecode.
With external audio, you can slave the cam's TC to the TC output of the BWF recorder.
Then you can use BWF / QT merge (one of my apps) to sync them, or use Sync 'n Link.
(another third party application)
If it is not possible cause you're shooting with a cam without a TC input, you can record the TC output on one of the audio tracks of your cam, and use FCPauxTC reader to decode the beeps and translate that to QT TC, and again use the former tricks to sync them.
It is difficult when you have never done it, but very easy once you get the hang of it, and it saves a huge amount of time to do it right from the start.
Have a look at the FCP aux TC reader here:
http://www.videotoolshed.com/?page=products&pID=26
Sync 'n Link can be found here:
http://www.assistedediting.com/Sync-N-Link/
/// disclaimer, i AM the owner of Videotoolshed, and i WILL (at least try) to make money on it. ///
/// i do NOT have any relation with AssistedEditing.com, besides friendship with the owner. ///

Audio moves out of sync or alignment with video after moving clip

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Synching a separate audio file with video

Hello, I was hoping someone might be able to help.
I have a video file but I am trying to sync a audio file to the video.. Not the video's original audio recording but a different file. Basically I have a recorded live band performance and I also have a direct out audio recording of same song (which is better quality than the video recorders internal mic) I want to sync the direct audio to the video.. The biggest issue is the tempos of the video and the direct audio recording are different. Can you set the tempo of the video file to the audio or vice versa? Can this be done in FCE or is this something for Logic Express.?
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This is a BEAR!
First need to know much more and even then, oh well...
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Maybe a sound engineer might be able to help more. Ask on a Pro Tools or Logic board?
Good Luck -
B.S.

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Hi -
Barbara Smits wrote:
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meaning you have done this exact procedure successfully before?
but suddenly I have out-of-sync audio when mixing six channels in FCP. Using my Canon XL1-S, I recorded 4 channels of audio in 12 bit mode, 32 khz. I then added another two channels of audio from a separate Sony digital recorder into the FCP edit.
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Hi(Bonjour)!
Did you shoot in DV or HDV ?
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