# 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

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

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

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

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

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

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

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

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.