Subsetting (thinning) Files

I use the free version of TimeSnapper to help with reporting hours worked on various projects. The program saves a screen capture (png) at a user specified capture rate. To keep the logs manageable I have set the capture rate at one capture every 5 minutes.

Recently the program reset itself to its default of one capture every 5 seconds. I now have several days of log files that I would like to thin down to one capture every 5 minutes, because the capture files are taking up too much space and I have to browse through too many files to find what I want.

Does anyone know of a way to thin these files down, leaving me with only one capture every 5 minutes. To complicate issues, TimeSnapper stops capturing when the computer is not in use (as when I'm in a meeting or at lunch), so it's not quite as simple as keeping every 60th file and deleting the rest.

Thanks.
 
So you are pruning file content, not the number of files per se.

How precise does the 'very 5 minutes' need to be? Why is not 'every 60th record' not sufficient?
 
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