Logic Pro X shows me this:

enter image description here

1 second, 15 fr and 56 sub?

How do I convert that into seconds?

  • 4
    Frames and subframes, google SMPTE timecode.
    – user48353
    Mar 20, 2019 at 22:05
  • @replete that's way to complex for me; there are a "random" number (commonly 24, 25, 29.97 or 30) "fr" in each second, and "sub" is about frame-dropping? I just want to know how I can convert that ^^ into literal seconds :c
    – minseong
    Mar 20, 2019 at 22:12
  • 2
    It is possible to show milliseconds or samples instead of “bits” (aka subframes) in the time display. That way you don’t have to convert at all. See: support.apple.com/kb/PH13440?locale=en_US&viewlocale=en_US Mar 21, 2019 at 3:20

1 Answer 1


This is an SMPTE timecode. fr is frame number. sub is subframe giving higher granularity. To convert this information to seconds you need to know your framerate. Logic Pro uses a value of 80 subframes per frame, so to convert frame and subframe to seconds use (frame + subframe/80) / framerate. For example, if your framerate is 24, then you have (15 + 56/80) / 24 = 0.654 seconds.

  • Thanks for this answer! Is there a setting in Logic to display the seconds converted from frames and subframes so that we don't have to do the math on the side? It'd be useful to see in realtime for example when selecting section with the marquee tool.
    – palako
    Apr 20, 2020 at 13:10

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.