Deleting every nth frame (again)

Hey all,

I have a video where every single 5th frame is a duplicate. So I need frames 0,1,2,3 - 5,6,7,8 - 10,11,12,13 - etc...

I've seen this post but I myself am not familiar with expressions enough to write it just by what the person is suggesting.

I found a few suggestions such as:

f = timeToFrames();

n = Math.floor(f/5);

framesToTime(n+f);

Also this from a random YouTube video I can't find:

f = timeToFrames();

p = Math.floor(f/1);

framesToTime(p*1.5);

Neither work. The frames start jumping erratically. 2 frames at a time, then 150 frames, etc etc.

In general programming to iterate and skip every nth number I'd just do a modulos check and skip any 0 sum. Something like:

f = timeToFrames();

n = f % 5;

if (n == 0) { f++; }

framesToTime(f);

This also produces some really odd frame counts although it doesn't jump to the hundreds eratically. It just doesn't work.

How would I skip every 5th frame?

Thanks for tips!