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Convert a 720p/59.94 timeline to 1080i/59.94?

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gruetz60
Convert a 720p/59.94 timeline to 1080i/59.94?
on Jun 22, 2007 at 4:06:05 am

Hi All --

If I have a sequence at 720p/59.94 (normal varicam footage coming in frm a Panasonic AJ-HD1400 via SDI to a Kona 3 card and into ProRes), can I somehow transform that sequence into a 1080i/59.94 sequence in the Media Manager for comforming at uncompressed? It seems to be a vexing problem.

The rub, of course, is that the Kona doesn't appear to have any 1080/59.94 settings.

I realize 29.97 and 59.94 are supposed to be the "same thing", but when I try to create my new uncompressed sequence in Media Manager at 29.97, it balks and says my framerates don't match. Fair enough.

So, I've tried cutting my 720/59.94 sequence into a 720/29.97 sequence and then going into Media Manager. This time it doesn't balk and gives me a 1080i/29.97 ready for redigitizing...except there's something wrong. There are little one frame gaps between some of the clips and the overall length of the sequence is 1 frame shorter.

Obviously, this does not sit well with me.

Does anybody know of a way to force the Kona to play nice on a 59.94 timeline in 1080i?

thanks alot.

geoff





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walter biscardi
Re: Convert a 720p/59.94 timeline to 1080i/59.94?
on Jun 22, 2007 at 10:28:44 am

1080i/60 is 29.97 DROP FRAME. 60i is 60 interlaced fields or 29.97 frames per second.

720/59.94 is 59.94 NON DROP FRAME. 59.94 is 60 frames per second so it does not actually match 29.97.

[gruetz60] "If I have a sequence at 720p/59.94 (normal varicam footage coming in frm a Panasonic AJ-HD1400 via SDI to a Kona 3 card and into ProRes), can I somehow transform that sequence into a 1080i/59.94 sequence in the Media Manager for comforming at uncompressed? It seems to be a vexing problem."

You don't have to use Media Manager to conform it over to 1080i. Simply use Media Manager to conform the final sequence at 720/59.94 into its own project for onlining.

Now in that project, set up your Easy Setup for 1080i/29.97 10bit UC. Set up your Kona to cross convert 720 to 1080i. Capture. That's all you need to do. don't use Media manager to convert anything, just stay in 720 and let the Kona make the conversion for you.

I do this all the time and just completed a whole run of Good Eats converting everything from 720 to 1080i during capture and it works brilliantly.



Walter Biscardi, Jr.
http://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.

All Things Apple Podcast! http://cowcast.creativecow.net/all_things_apple/index.html

Read my blog! http://blogs.creativecow.net/WalterBiscardi


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walter biscardi
Re: Convert a 720p/59.94 timeline to 1080i/59.94?
on Jun 22, 2007 at 10:37:56 am

I should clarify that there is a 1080/60p that truly is 60 frames per second, but that's different than 1080/60i and requires a lot more drive throughput than 1080i/60.

Walter Biscardi, Jr.
http://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.

All Things Apple Podcast! http://cowcast.creativecow.net/all_things_apple/index.html

Read my blog! http://blogs.creativecow.net/WalterBiscardi


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Mike Most
Re: Convert a 720p/59.94 timeline to 1080i/59.94?
on Jun 27, 2007 at 12:21:55 am

Walter, frame rate has absolutely nothing to do with drop frame and non-drop frame time code. Drop frame is a time code counting sequence (NOT a frame rate) that skips two frames each minute except for multiples of 10 minutes. Although drop frame time code was conceived in order to make the time code on NTSC color video equate to real time, it is not married to any frame rate. You can have 30 frame drop frame, and you can have 29.97 non-drop frame. And both of those variants have been used (mostly in the past, but still...) for various reasons.

And in terms of running time vs. number of frames played, 29.97 and 59.94 are exactly the same. It has just become more common to refer to NTSC and 1080i/60 HD as 29.97. The primary difference between 1080i and 720p is the "p" vs. the "i" - one is progressive (60 actual frames) and the other is interlaced (60 fields). But none of this has anything whatsoever to do with drop frame and non-drop frame time code.


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