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23.98 tc to 29.97 DF tc: Or why the History Channel hates me…
Alright, so I’m looking for a spot on frame accurate way of calculating what the TRT of a timeline cut at 23.98 needs to be to be converted to a delivery TRT on 29.97 DF.
This may sound foolish, I don’t understand why History Channel has the specs that they have, but the various ways that I thought would work all give different results.
Thanks in advance.
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6 Replies
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Read this:
https://lfhd.blogspot.com/2008/10/timecode-calculator.html
Either use the calculator, or use my method that I linked to in that blog post. This all stems from the need to deliver to History Channel an HDCAM 23.98 master at NDF, but also have a frame accurate 29.97 DF Digibeta master. Took me a bit to figure this out. And I was able to convince the author of that TC Calc software that a conversion of this type was needed.
Good luck.
Shane
GETTING ORGANIZED WITH FINAL CUT PRO DVD…don’t miss it.
Read my blog, Little Frog in High Def -
Unless I’m doing something wrong (probably am), that calculator gives me an almost 9 minute discrepancy. I’ve done a number of History Channels shows, unfortunately I always forget the difference, and I know that it’s more like, but not quite 3 seconds per hour.
I’m going to check the blog now though.
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[Eric Johnson] “that calculator gives me an almost 9 minute discrepancy”
You mean nine SECOND, right? And yes, there will be a 3second 14 frame difference each hour.
With the calculator you choose the 23.98 non-drop option. Then you type in the timecode you have. Then you switch the setting to 23.98 drop (that doesn’t really exist, but it is there ONLY as a means of calculating the time properly)…that will show you how long it will be drop frame.
SO, if you have a time you need to hit at DF, type that number into the calculator under the 23.98 drop setting, then switch to 23.98 non-drop, and that will be your target time for the 23.98 sequence setting.
Shane
GETTING ORGANIZED WITH FINAL CUT PRO DVD…don’t miss it.
Read my blog, Little Frog in High Def -
Now I’m confused further. Using the timeline method, which I had tried but abandoned due to different machines getting different answers.
We got it sorted out and came up with 2s19f to be removed from the 23.98. Are you saying 3s14f per 60m actual? Or 3s14f per hour of programming, approx 45m actual?
And no, I meant 9 minutes. 44:50:00 23.98 NDF came out to 35:54;04 29.97 DF. LIke I said, if it does work then I’m doing it wrong, but don’t know what I’m doing wrong.
Thanks for the help.
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[Eric Johnson] “Are you saying 3s14f per 60m actual? Or 3s14f per hour of programming, approx 45m actual? “
That was one solid hour, 60 min actual. Because my shows tend to be 1:33:14 (rough guess) for two hours, I would have about a 5 second discrepancy…1:33:08:10 as the calculator says. So NDF it is 1:33:14:00 NDF is 1:33:08:10 DF.
[Eric Johnson] “44:50:00 23.98 NDF came out to 35:54;04 29.97 DF. LIke I said, if it does work then I’m doing it wrong, but don’t know what I’m doing wrong. “
Are you using the calculator I linked to? And are you sure that you are doing 44 MIN and not 44 HOURS?
By my calculation, 44:50:00 NDF comes out 44:52:16 DF. If you need your show to be 44:50:00 DF, then your NDF timeline needs to be 44:47:08. HEY! Right…that’s the number we used for that hour long series I did for History. That number completely rings a bell.
Shane
GETTING ORGANIZED WITH FINAL CUT PRO DVD…don’t miss it.
Read my blog, Little Frog in High Def -
I am using the one in your link. I’ve actually been using that calculator for some time for other purposes for some time. And unless it does days:hours:minutes:seconds instead of HR:MIN:SEC:FR then yes it’s set to 44 minutes.
After I got the two machines to get similar results 44:47:08 is what we got also. Appreciate the confirmation.
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