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Calculating 30 DF run time run time on 23.98 footage

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Greg Lewis
Calculating 30 DF run time run time on 23.98 footage
on Aug 28, 2017 at 1:10:30 am

Hello all,

I'm guinea pigging editing a show in Premiere for a large US cable channel with an entirely Avid based workflow. Everything is going well, but the only snag I've hit is that the network's runtime standards need to be calculated at 30 drop frame, even though we are working at 23.98. In Avid, there is a simple dropdown menu for this, but Premiere does not seem to have this feature. I believe I've figured out a roundabout workaround, which I will describe below, but has anyone else encountered this issue and have a simple solution?


What I've done thus far is take my 23.98 timeline and drag it onto a 30 drop frame timeline to see my run time. With this method, 00:23:58:14 of 23.98 media comes out to 00:24:00:00 in 30 drop frame. This seems to fall in line with what I've seem in Avid. I've also tried running 30 drop frame timecode on an adjustment layer on the 23.98 sequence, however the math just does not seem to make sense and I can't quite figure out why.


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Brent Marginet
Re: Calculating 30 DF run time run time on 23.98 footage
on Aug 28, 2017 at 2:19:53 am

Here's a free calculator that can help with these calculations.
It will be a frame or two out sometimes because of how it rounds up or down the numbers but it's a great place to start.

http://www.drastic.tv/productsmenu-56/videoiosoftwarelist/76-videosw/utilit...

So set it to 29.97DF and enter the show length which you stated was 24;00;00.
Now switch to Frames and then multiply this number by 24 and divide by 30 and now switch to 23.98.
The result is 23:58:12.

"MY MEDIA/PROJECT MOTO: If you think three copies of your media or project are enough.
Take a moment to place a value on them and then maybe add two more.
Hard Drives are now stupidly cheap. A RE-SHOOT AND YOUR TIME AREN'T."


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Greg Lewis
Re: Calculating 30 DF run time run time on 23.98 footage
on Aug 28, 2017 at 4:52:35 am

Thanks Brent. This will certainly give me some confidence that I'm hitting the right benchmarks for my file layout, but I was hoping for a solution within Premiere. This does not appear to exist though.


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Peter Garaway
Re: Calculating 30 DF run time run time on 23.98 footage
on Aug 30, 2017 at 6:30:36 pm

Hi Greg,

I think you may be able to achieve the same results by changing the sequence settings to custom editing mode and then changing the timebase to 29.97 and display format to 29.97 DF.

Does that help?

Peter Garaway
Adobe


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Greg Lewis
Re: Calculating 30 DF run time run time on 23.98 footage
on Sep 9, 2017 at 12:40:15 am

Pete,

Thank you for your response. I think that is going to be the best way to handle this. I was initially a little wary bringing the 23.98 media onto the 29.97 DF timeline for fear Premiere would add or drop frames to make up time, but everything seems to be functioning normally. Thank you very much for your help.


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Peter Garaway
Re: Calculating 30 DF run time run time on 23.98 footage
on Sep 11, 2017 at 5:09:00 pm

Great! Glad that's working out for you Bret.

Peter Garaway
Adobe


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Dave LaRonde
Re: Calculating 30 DF run time run time on 23.98 footage
on Aug 28, 2017 at 4:58:14 pm

Please don't say you're actually using 23.98 as your frame rate.
Please say you're using the actual, genuine frame rate of 23.976 in PP.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Bret Hampton
Re: Calculating 30 DF run time run time on 23.98 footage
on Sep 7, 2017 at 6:58:19 pm

I think like many people he just writes 23.98 when he means 23.976. I know I do. If you round up then he's correct. Anyway I've never seen a 23.98 edit mode in Premiere although they have 24.00, 25.00, etc.

I come from broadcast tv and people were always saying 30dropframe when they meant 29.97. We just got used to it.


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