# Timecode CalculatorJuly 5, 2005 10:27 AM   Subscribe

Timecode filter: how do I subtract a given number of frames from 400 timecodes in an Excel spreadsheet?

Video timecodes are in the following format (for NTSC non-drop frame) - hh:mm:ss:ff. The ff represents frames, of which there are 30 per second (00 - 29). I want to subtract 5 frames from 400 different timecodes, all of which are less than a minute long.

The best I've come up with so far is removing the hh:mm using find and replace (because all the video clips are under a minute), then using the LEFT and RIGHT Excel functions to separate the seconds and frames into individual columns, then multiplying the seconds by 30 to give their length in frames, adding the seconds column to the frames column to give total frames and then subtracting 5.

This is as far as I've got - I'm not sure if this is the best method, and I don't know how to return the total frames to the original hh:mm:ss:ff format (including that single digit seconds and frames require a leading 0 added).

I've Googled all over the place and whilst there are several timecode calculators available, they only do individual calculations as opposed to batches. And yes, I've tried www.belle-nuit.com - unfortunately the Excel macro doesn't work correctly on current versions of Excel, and the Filemaker Pro plug in appears to only do individual calculations.

I have Excel 03 on XP Pro, and easy access to Macs if required. Any ideas? Thanks.
posted by forallmankind to Computers & Internet (2 answers total) 1 user marked this as a favorite

So you've got a column of 400 corrected framecounts, let's call it F1:F400.

Set the formula for G1 to =CONCATENATE("00:00:",TEXT(trunc(f1/30,0),"00"),":",TEXT(mod(f1,30),"00")).

Fill it down to G400.
posted by fleacircus at 11:18 AM on July 5, 2005

Response by poster: alright - you guys ROCK!!! I'd been pulling my hair out on that one all week - thanks!
posted by forallmankind at 5:22 PM on July 5, 2005

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