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MP3 recorders and FCPX... sync solution needed

445 Views 8 Replies Latest reply: May 14, 2013 11:13 AM by Matt13 RSS
Matt13 Level 2 Level 2 (390 points)
Currently Being Moderated
May 12, 2013 8:58 AM

Hello all,

 

I began using MP3 recorders for collecting some audio (weddings, corporate stuff).  My workflow is changing the MP3 to an AIFF, then adjusting the duration or speed of the resulting AIFF file to match my video in FCPX.  Pretty quick and easy stuff.  But, I've noticed on longer shoots that after I export the video file (usually to m4v), the audio in question drifts a little... as if I never made the adjustments during editing.

 

I'm sure with a lot of trial and error I could figure it out.  I did find that FCPX turns the AIFF I create into a WAV (I always check the 'create optimized media' box).  Not sure if that has anything to do with it, but I was hoping to find another pro out there who has mastered using recorded MP3 files as an audio source for their videos with a workflow that results in good, audio-synced exports, before I spend a few valuable editing days doing my own tests in trying to figure this out.

 

Any help would be appreciated! 

 

For the record... I've always used UHF in the past, but was tired of the occassional drop out.  I've had great success with MP3 audio recording for shorter segments and am now trying to take that workflow to longer projects if I can find a solution to this sync issue I'm experiencing.

  • BenB Level 5 Level 5 (7,535 points)
    Currently Being Moderated
    May 12, 2013 9:08 AM (in response to Matt13)

    No need to "Optimize" an AIFF file.  I'd not do that.

    Be sure that your MP3 originals are at the video standard 40kHz sample rate.  A mis-match of sample rates is the most common cause of audio drifting out of sync.

  • Karsten Schlüter Level 7 Level 7 (29,460 points)
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    May 12, 2013 9:56 AM (in response to BenB)

    BenB wrote:

    …  are at the video standard 40kHz sample rate. …

    48kHz ..... typo?

  • BenB Level 5 Level 5 (7,535 points)

    Yeah, 48, not 40, forgot I wasn't in Bizzaro World today.  LOL  Type-o

  • BenB Level 5 Level 5 (7,535 points)
    Currently Being Moderated
    May 13, 2013 1:52 PM (in response to Matt13)

    Highlight the project in the Project Library, go to the Info section of the Inspector, bottom right is a button with the icon of a wrench.  Click that.  Change the audio of the Project to 44.1.

  • BenB Level 5 Level 5 (7,535 points)
    Currently Being Moderated
    May 14, 2013 11:03 AM (in response to Matt13)

    A mis-match of sample rates is the most common cause of audio drifting out of sync.

     

    Wireless has nothing to do with it, and is how I record everything.

     

    You should also create a new Project from scratch, force it to 48kHz, then start dropping your media in it.

     

    Just be sure everything has the same audio sample rate, audio files, video files, project settings, etc.

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