Jittery 1080i footage in 720p timeline

Apple Final Cut Pro Legacy

Jittery 1080i footage in 720p timeline

Posted by John Fitzgerald on April 22, 2008 at 10:35 pm

Hi,

I’ve got a FCP project with several different footage sources (720p, 1080i, HD, HDV, DV, 24fps, 30fps, you name it). The only footage that is giving me any trouble is 1080i HDV footage that was shot with the Sony-V1U. The footage was shot at 24fps.

When viewed from the browser, the V1U clips repeat every fourth frame. In other words, the frames will show like this: 1, 2, 3, 4, 4.

However, when viewed in the 720p timeline, the same clip will repeat every fourth frame (1, 2, 3, 3).

FWIW, footage shot at 30fps with the same camera looks fine both in the browser and on the timeline.I’m guessing the problem has something to do with 24p and interlacing, but I’m not sure what will solve the problem. Any ideas would be greatly appreciated. Here is the info for the problematic footage and the timeline:

FCP Studio 2, Mac OS 10.4.11
Footage – 1080i, shot at 24 fps

Timeline – 1280×720, HDTV 720p (16×9), Pixel Aspect Ratio: Square, Codec: Apple Pro Res 422, Editing Timebase: 23.98.

Thanks,

John

John Fitzgerald replied 18 years, 4 months ago 3 Members · 4 Replies
4 Replies

Richard Harrington
April 23, 2008 at 1:04 am

Run the footage through Compressor and use the Advanced Format Conversion settings

Richard M. Harrington, PMP

Author: Photoshop for Video, Understanding Adobe Photoshop, and ATS:iWork
John Fitzgerald
April 23, 2008 at 4:58 am

Thanks. However, I’m hoping there is a way to fix the footage in the timeline. I’m currently trying the Nattress pulldown removal plugin. I’m not sure if it’s a pulldown problem because I’m not too familiar with pulldowns, but I’ll let you know if it works.

Thanks again.

John
Mark Maness
April 23, 2008 at 4:52 pm

[John Fitzgerald] “Footage – 1080i, shot at 24 fps”

Before we get started… There is no 1080i 24 fps footage. 24 fps is a progressive format so to correctly identify your footage, it should be 1080p 24. And most likely since it was shot with the V1U, its 23.98.

Sounds like maybe the original footage was captured incorrectly. This will make you footage look jumpy like you are saying. Since you say you are mixing lots of footage are various frame rates and screen sizes, it very likely this was captured incorrectly. Capturing 1080i footage as 24p will make it very jumpy at times.

_______________________________

Wayne Carey
Schazam Productions
http://www.schazamproductions.com
https://blogs.creativecow.net/waynecarey
John Fitzgerald
April 23, 2008 at 7:16 pm

I don’t think it was captured incorrectly. Based on what I’ve researched in the last 24 hours (note: that research came about 6 months too late), I think this is the problem:

If you are shooting in 24p mode with the V1U, you need to edit it on a 29.97 timeline. In order to edit on a 23.98 timeline, you will have to shoot in 24pA mode. I’m not sure if this applies to all HDV cameras and NLE editors, but it seems to be the case for the V1U and FCP.

I have cut and pasted my master sequence into a 29.97 timeline and so far the results look good for the V1U footage. I am going to have to do some more tests to determine if the new timebase will affect footage shot with the GY110 and HVX-200.

I will report back if I can find anything else out. Thanks to everyone for your responses so far.

John

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