Need A Calculator - Convert FPS to Minutes and Seconds

Discussion in 'Digital Video' started by John Doe 57, Jun 6, 2009.

  1. John Doe 57 macrumors 65816

    John Doe 57

    Joined:
    Jan 26, 2008
    Location:
    Los Angeles, CA
    #1
    I filmed a track meet the other day and the some of the results will not be posted online. So I have footage of races with no time result. I filmed from when the the gun went of to when the runner crossed the finish line. I just need to subtract the frames from when they finish, from when the gun goes off. I have tried some online calculators, but they round the answer back to 29.97 fps. So no answer will read xx.29 or higher. I am using iMovie HD, with 29.97 fps. I'm not sure if I'm using drop frames or non-drop frames. Thanks.
     
  2. LethalWolfe macrumors G3

    LethalWolfe

    Joined:
    Jan 11, 2002
    Location:
    Los Angeles
    #2
    Video is 29.97 frames per second so you can't get anymore accurate than 1/30th of a second.


    Lethal
     
  3. John Doe 57 thread starter macrumors 65816

    John Doe 57

    Joined:
    Jan 26, 2008
    Location:
    Los Angeles, CA
    #3
    Alright. Where could I get a calculator though?
     
  4. LethalWolfe macrumors G3

    LethalWolfe

    Joined:
    Jan 11, 2002
    Location:
    Los Angeles
  5. John Doe 57 thread starter macrumors 65816

    John Doe 57

    Joined:
    Jan 26, 2008
    Location:
    Los Angeles, CA
    #5
    Thanks, but I'm still confused. Here is an example of my problem:

    The gun goes off at 5:49:19 (Minutes Seconds Frames), the runner crosses the finish line at 6:00:16. I need to know in seconds, how long it took him to finish. Sorry, I'm just not very good at this or at math in general.
     
  6. EX1127 macrumors 6502

    EX1127

    Joined:
    May 26, 2009
    Location:
    Louisiana
    #6
    Can you not subtract end from beginning? or am i not understanding the question?
     
  7. CaptainChunk macrumors 68020

    CaptainChunk

    Joined:
    Apr 16, 2008
    Location:
    Phoenix, AZ
    #7
    With that calculator widget that Lethal posted, you can subtract the beginning timecode from the end timecode and get a result in timecode format.

    And from there, it's simple math converting the frames to a decimal value. You would divide the number of frames at the end by 29.97. Example:

    The difference between the times you posted at 29.97 drop-frame (typical for DV) would be 10:27 (seconds:frames). 27 divided by 29.97 is about 0.901 seconds. Therefore, the runner's time in the case would be 10.901 seconds.

    There will be a margin of error as stated earlier in this thread because the video isn't any more accurate than about a 1/30th of a second to begin with.
     
  8. John Doe 57 thread starter macrumors 65816

    John Doe 57

    Joined:
    Jan 26, 2008
    Location:
    Los Angeles, CA
    #8
    Thank you!!! That is what I needed. 1/30th will have to do, I just needed something pretty close.
     

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