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23.98 vs 23.976
When the KONA 2 captures @ 23.98 is it different than a 23.976 capture?
I thought it was just rounded up, but are they different frame rates?
David
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8 Replies
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they are rounded. It’s the same thing.
Bob Zelin -
Thanks Bob. I had a lengthy discussion the other day with an AVID editor who insisted it had to do with the speed of the audio being different at 23.976 vs 23.98. the fraction of .004% apparently makes a difference when the pulldown is put back to 29.97.
David
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I’ve had issues where 23.98 hasn’t been the same as 23.976. If you did a direct comparison between the two movies, they will be ever so slightly different. 23.976 for me has worked better. Where it gets a little strange is where a program will round up to .98 in the interface display but the actual value you plugged in makes a difference.
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there is no such thing as 23.98. It’s only 23.976xxxxxxxxx, and it’s rounded off to 23.98 for print and menu display. It’s like the SC frequency – there is no such thing as 3.58 MHz, it’s some long number, same with 29.97 for NTSC frame rate – it’s some long number – it’s just rounded off. Someone has too much time on their hands.
Bob Zelin
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I have a film-look process that is pretty much the ReVisionFX route with FieldsKit and Twixtor. Somewhere along the line I had put some work through a different software that made my movies 23.98 and when I attempted to match that back, it didn’t work. Thus began a long search to find the problem and I finally realized that .004 makes a difference. In my attempts at troubleshooting, I seem to remember saying to myself, “well if the plugin only shows two decimals and rounds up, perhaps I should do the same to the composition settings”. well you know where that lead. Sometimes these things seem to lead from one rabbit hole to another.
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…What Bob said. Frame rates are standardized through SMPTE and are proliferated in the playback/rec rates on professional machines accordingly. There should not be a SMPTE standard that is either 23.98 or 23.976. It is 23.976……
Except that I would add that if you are working in the graphiccs domain and have to manually set a frame rate, be sure to do it to the third decimal if you can. I had a similar lack of registration when unknowingly rendring an AE seq at 30 fps [using 29.97 source material] rather than 29.97. It appeared that AE decides to account for the microscopic frame rate difference by doubling the the sixth frame causing the sync issue. that was way back on version 4.0, so maybe that has changed by now.
Point it, match it up as best you can.
steve covello
double wide post -
It’s odd.
I captured 23.98 via FCP.
When I open this footage in AE COMP
AE sees/reads the footage as 23.976.
David
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That is a good thing. Make sure your After Effects comp is set to 23.976.
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