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Audio and Video are not synchron

241 Views 6 Replies Latest reply: Nov 13, 2012 4:00 AM by Jakob Peterhänsel RSS
Jerschen Calculating status...
Currently Being Moderated
Nov 12, 2012 10:43 PM

I want to make a video from our band, i have a moviefile and separetly an audiofile. The multiclip function doesn't work very well, so i have synchronize the two tracks manually. The next problem was to adjust the length of the audio track to the video track. i have shorten the audio track for 2 seconds (retime) to keep the track synchron from the beginning to the end. In FCP it works perfect, but after export the file, it starts synchron and will go apart more and more. how can I fix this?





Final Cut Pro X, OS X Mountain Lion (10.8.2)
  • Karsten Schlüter Level 7 Level 7 (29,465 points)
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    Nov 12, 2012 10:47 PM (in response to Jerschen)

    does the sample-rate of your recording match the sample-rate of your Project Settings?


    (most musicians use 44.1kHz, video is mostly 48kHz) ....

  • Karsten Schlüter Level 7 Level 7 (29,465 points)
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    Nov 12, 2012 11:59 PM (in response to Jerschen)

    best-practice is indeed, to use 48kHz ...

    (I never noticed issues with shorter, a few minutes long clips)

    use any converter/audio processor to resample your audio file BEFORE import into FCPX.


    another reason for no-synch could be:

    does your export frame-rate match the Project frame-rate?

  • Karsten Schlüter Level 7 Level 7 (29,465 points)
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    Nov 13, 2012 1:05 AM (in response to Jerschen)

    Jerschen wrote:

    … Should be this the differenz?

    I don't know what you've done exactly


    best-practice-advice for FCPX is still:

    • avoid using mp3, use aiff

    • avoid sample-rates other than 48kHz


    FCPX does marvel in handling diff. video-'formats', audio isn't its main domain.

    so, why not perform a 10sec task, and convert your audio material in a recommended format?

    keep in mind: mp3 could mean variable bitrates - keep that in synch with a probably diff. time-base …-


    I've done a few 'music videos' so far, no rocket sience as long as you stay within the specs/limitations of the application. we playback music from a CD while recording video. we use same CD as 'master track' in FCPX (in some cases we don't even resample, no synch issues so far). we use the 'live'-audio from the cams to synch multi-cam = a snap!, although takes are 'orphanized' = just isolated seconds of the whole piece.-


    a good edit starts BEFORE recording .......


    means: make a plan, organize what when and how material is needed.

    I'm no fan of trial-and-error-editing

  • Jakob Peterhänsel Level 3 Level 3 (655 points)
    Currently Being Moderated
    Nov 13, 2012 4:00 AM (in response to Jerschen)

    Well, if you Retime the music track it will absolutely not be in sync!

    Retime means: stretch or push together THE SAME DATA for shorter or longer times.


    If you need to 'fit' your audio track, you need to Cut/Trim it, Not Retime it.. !


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