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Activity Forums Apple Final Cut Pro Legacy Audio drift. What’s going on?

  • Audio drift. What’s going on?

    Posted by Dan Hayes on September 26, 2008 at 6:28 pm

    Hi All,

    I’m editing a project with sequences that are 1024×768 30fps 48k. We needed to do some audio sweetening so I exported an OMF and a Quicktime for the Protools session. I get back a 48k aif of the final mix and drop it into my timeline only to find that it drifts out of sync to the point that at the end of my 13 minute and 15 second sequence the audio is about 26 frames too short(the final mix plays faster than it should).

    The mix aif reimported into protools stays in sync with the imported omf. And when the quicktime and the final mix are loaded into Premier Pro there is no drift.

    Anybody have any idea what’s going on, where I should look for the problem?

    Thanks
    Dan

    10.5.4
    6.0.4
    Kona3

    John Fishback replied 17 years, 7 months ago 2 Members · 1 Reply
  • 1 Reply
  • John Fishback

    September 27, 2008 at 7:23 pm

    I’m not an expert in this, but I think the difference might be whether the Pro Tools session was set to drop or non-drop frame. I did a quick check in Pro Tools. I set the cursor to 13:15:00 drop frame. When I switched Pro Tools to non-drop the time became 13:14:06 – a 24 frame difference.

    John

    MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.4 QT7.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
    ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID
    24″ TV-Logic Monitor
    Final Cut Studio 2 (up to date)

    Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN

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