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Activity Forums Apple Final Cut Pro X Audio slipping in FCPX

  • Audio slipping in FCPX

    Posted by Jon Mulvey on September 22, 2023 at 8:43 pm

    Hello. I recently started having the audio from my Zoom recorder slipping behind my cam audio. I think I am keeping my frame rates set in my projects at 30p and cam audio at 48k. Which conforms to my Zoom settings. But when I select a clip that is on the timeline it shows 29.97. I assume that is the problem? This is a new occurrence and is got me having to cut and move the audio. Which is a pain. Any feedback would be most helpful. Cheers…

    Doug Metz
    replied 2 months, 2 weeks ago
    4 Members · 5 Replies
  • 5 Replies
  • Eric Santiago

    September 22, 2023 at 9:21 pm

    Did you test using a 29.97 project in FCPX?

    I don’t recall Zoom having frame rate base settings.

    Been a long time using one.

    I know it’s in SD MixPre6.

  • Jon Mulvey

    September 22, 2023 at 9:43 pm

    Thanks Eric. Sorry for the confusion. The Zoom recorder doesn’t have frame rates of course. But I have my Sony action cams mounted on my plane. They are all set to 720/30p I then set my FCPX project settings to the same. But once the footage is imported and I analyze it in the FCPX session it shows 29.97. I assume those three frames over the hour of flight footage is shortening the clip and putting the audio behind? This is a recent issue.

  • Ben Balser

    September 23, 2023 at 2:12 pm

    never mind…

  • Ben Balser

    September 23, 2023 at 2:36 pm

    Audio out of sync more and more over time is caused by one thing, audio sample rates not matching. Verify both devices are recording 48kHz audio. Audio is not recorded in FPS so that has no effect.

    It seems your action cam is claiming 30fps when in reality it is doing the drop-frame version. I’ve seen quite a few cameras do that. Wish they’d not. But now you know what your camera is REALLY recording.

    As for Zoom, I have never combined material sourced from other devices with it. But I do always see that Zoom is pretty consistent in recording non-standard 32kHz audio. But then it can only record 720 video, which sucks. But you are going to have to contend with Zoom being 32kHz and your camera being 48kHz. If your camera has an audio sample rate setting, and it lets you change to 32kHz sample rate, do that. Otherwise use Compressor, convert the Zoom clip to a new H.264 clip with 48kHz audio. Usually that will work. Also, if your camera will let you set it to 25fps to match Zoom, that’d help with matching things up a tad bit, also.

  • Doug Metz

    September 26, 2023 at 7:33 pm

    Looks like OP is talking about a Zoom field recorder, not the app in this case. I’ve got an older H4 that I still use from time to time, and it would get stubborn about changing sample rates. A firmware update seemed to stabilize it for the most part. It would switch itself to 96kHz, so I check it every time now (which is maybe once a year).

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