Trouble With Audio Coming Out of Sync

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Trouble With Audio Coming Out of Sync

I am having trouble with audio sync

I am using .mov files of myself talking however I also record audio of myself talking as well. The audio files record as mp3 however I convert them to aiff files in order to better synch them in FCP

I have an audio sound as an in point in order to better sync them and the syncing is perfect when i start.

My files are about an hour and a half long and 20 minutes or so the audio starts to come out of sync and my mouth becomes a half second or so behind the audio. I record this audio live so there is no delay between my speaking and my recording voice but the longer the video goes the more out of sync I become.

My syncing method that I use is "Merge Clips" at the in points.

Has anyone else experienced this?

IMAC, Mac OS X (10.0.x)

Posted on May 14, 2010 7:18 PM

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Answer 1

NLEdit

Level 4

1,645 points

May 14, 2010 7:40 PM in response to darrylxx

sure, it happens when both sources are not running at true speeds. This is why most people shooting video are recording the sound to the same tape at the same time.

What are you shooting on and what records the sound?

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Answer 2

darrylxx Author

Level 1

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May 14, 2010 7:44 PM in response to NLEdit

Wow,

You have hit me with something I simply never thought of. Thanks for expanding my thought process here.

to answer your question I record on a Kodak zi8 for video . It records audio too but I have do disregard it because the sound from my mixing board comes thru as a humm in the background and I use a various programs to record the audio.

Is there a way for me look at settings of the video to see what it records at and then modify my audio to match it?

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Answer 3

NLEdit

Level 4

1,645 points

May 14, 2010 7:54 PM in response to darrylxx

All sorts of things you can do.
Easiest fix is just to run down your timeline and every few minutes snip the audio and move it back into sync.

Now after that;""
Qe have no idea what your process was. We assume you're editing in Final Cut. How did you import your footage? What format is it in the browser?
what are the settings of your timeline? Look at the sequence settings.

You know that you can plug audio from
mic into a Zi8?
You need to get rid of the mixer hum. Likely ac electrical
interference , a ground fault, but who knows.

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