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Audio Sync Issues FCP 6/7

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Robert S.  Pugh
Audio Sync Issues FCP 6/7
on Oct 20, 2015 at 5:44:02 pm

Hello all!

Over View
I'm currently working on a new project for new client. I've been asked to polish a pre-existing edit, with some additional clips and grading.
The project files are largely .mov h.264 (48hz audio). I've completed my alterations and grade, including some minor improvements to the audio quality.

The Issue

When I'm exporting the video from Final Cut Pro the audio is going out of sync. I say going, as it seems to be okay at first and then further down the timeline it becomes out of sync, and I don't know why. I've tried a few things to fix it, and have listed these below.

Settings and Files
Files are: MOV H.264 (48hz audio)
Timeline (1920X1080)

What I've tried
There were some mp4 files in the project (that had audio) and I wondered if they were causing an issue.
So I removed the mp4 files from the project and cleared the audio render files. I also cleared the video render files.
Then closed and opened FCP and tried exporting with and without rendering, neither of which seemed to help.

I believe the audio to be set at 48hz in the timeline settings to match the clip.

Worth Mentioning?
When I playback the video in FCP 6 the audio seems to be synched okay, all the way through which has left me a little out of ideas and very stressed!!

Any ideas/help/suggestions would be gratefully received. If I've missed anything please ask me.

Many Thanks, Rob

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