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Forums Apple Final Cut Pro Legacy FrameRate and TCRate Questions

  • FrameRate and TCRate Questions

  • Adam Paez

    October 24, 2010 at 9:53 am

    First post in the forum. Glad to be here.

    I have two questions:

    1: I have a project where I have video that is 24fps and corresponding audio that has a TC Rate of 25. Is this a problem? I know that you can put everything in a timeline in Final Cut but is it wise to stay with the same fps as tc rate to avoid any software confusion?
    – I’ve syncronized a clip or two and it seems to be fine. I guess the one “frame” is almost impossible to perceive, or?

    2: Is it a problem to mix 23.98fps with 24fps in the same timeline? Would you do it? Is it necessary to render?

    Thanks in advance,


  • Bouke Vahl

    October 25, 2010 at 10:25 am

    What kind of audio do you have?
    If it’s Wave or BWF, it does not have a framerate.
    (Although you need to define a speed to properly decode the timestamp)

    For the second question, it’s probably wise to have everything at 23.976. Use Cinematools to slow down the 24 fps material, and probably you need to slow down the sound as well. (Qtchange can do this, download from my site).


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  • Adam Paez

    October 25, 2010 at 3:09 pm

    My audio is wave. How do I go about changing the speed to define the timestamp?

    And you answered my second question. Thank you.

  • Bouke Vahl

    October 25, 2010 at 4:38 pm

    This is in your project setup.
    If you change between 24 and 23.976(and do a restart of FCP!!!!),
    you can see the audio start time change.

    Time info in BWF is not set as absolute frame numbers, but as a count of samples.
    Now there are 48000 samples in a second, but a second of pal is 25 frames, a second of 24 is 24 frames, and a second of 23.976 is, well, close to 24 frames, but there is enough difference to make your life miserable when the TC hours go up…

    So, first create a project when things match as they should, marry video and audio and then start doing speed changes.
    (or you have to be a math freak like me. As said, QTchange can help you changing the speed, but you need to know what you are doing!)

    smart tools for video pros

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