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rlesterphx
Participating Frequently
May 9, 2019
Question

Interpreting 23.976 as 24 results in same duration

  • May 9, 2019
  • 1 reply
  • 621 views

In Premiere, shouldn't the Media Duration change when I interpret 23.976fps footage at 24fps?

For example:

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1 reply

R
rlesterphxAuthor
Participating Frequently
May 9, 2019

Update:

It appears that Premiere is actually showing the incorrect (24fps) duration for the original native 23.976 source file.  When I go to Interpret Footage for the 23.976 file and enter "Assume this frame rate: 23.976" the duration changes to what it should actually be.

Is this a new behavior?  I've done this many times in the past and feel like I would have noticed this..... But testing now in both 13.1.2 and 11.1.4 (CC2017) produces the same results.  Unless the change was in a shared core file?

Manually interpreting 23.976fps footage at 23.976fps corrects displayed duration:

True 23.976fps native duration as confirmed by file properties:

R
rodneyb56060189
Legend
May 9, 2019

hmmm. That's interesting. I wonder if the 23.976 ( which in your 2nd shot says 23.98 after assuming 23.976) has something to do with data block and CRC info being sent with frame to video monitors to tell them when one frame ends and when to start next frame display ?

??

I suppose if it was for broadcast to NTSC that would have to be changed to 30 fps maybe ??  Beats me.

R
rlesterphxAuthor
Participating Frequently
May 9, 2019

I don't think it's anything that complicated.

In the image I posted of the Windows file properties panel, that is the original, unaltered native source file which is 1:47:42 in duration at 23.976fps.  The 23.98 is just Windows rounding up.

That file should have a 1:47:42 duration when brought into Premiere but instead Premiere shows the 24fps duration of 1:47:35 upon fresh import.

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