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Pulsing image when converting Pal to NTSC

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Roberto De JesusPulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 8:17:25 pm

I'm trying to convert a 30ss PAL QT to a NTSC QT and every time I run it through AE and try to keep it de-interlaced the final image pulses when its playback.

Is there a step I'm skipping that I don't know of?

When I do interlace the QT the pulsing stops but I need a de-interlaced version in order to carry on.

Any thoughts?

Thanks

R


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Dave LaRondeRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 8:53:08 pm

[Roberto De Jesus] "Is there a step I'm skipping that I don't know of? "

Beats the heck out of me! How exactly did you try to convert PAL to NTSC using AE?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Roberto De JesusRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 9:12:52 pm

I take the QT and make a composition of it by drag and drop to the film strip looking icon on the project window.

I open then the composition settings window and change the PAL D1/ DV to NTSC D1.

I go to the Composition viewer and transform it to "Fit to Comp"

I drag the comp to the render window and is there where I set it for Animation codec/44.1 khz on the Lossless pulldown window. Under Best Setting/Time Sampling Pull down I just set it to 29.97 FPS and do not render any fields. (I don't want it interlaced)

I select the target destination and hit Render.

I'm sure I'm missing a crucial step...

R


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Dave LaRondeRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 9:35:49 pm

[Roberto De Jesus] "I'm sure I'm missing a crucial step..."

...a couple of them, actually. All you've done is force 25 frames/second to play within a file that's 29.97 frames/second. And guess what? Those PAL frames change at odd places in the NTSC frame rate. Of course it's going play back strangely.

If you intend to do this job in AE, you need to do one of two things:
  • Conform the PAL footage's frame rate in the interpret footage settings to 29.97. It will speed up a bit, but it's free.
  • Buy yourself frame rate conversion software for AE like Twixtor or Magic Bullet: they actually create new intermediate keyframes to make a 29.97 frame rate. They're anything BUT free.

You can't just slap PAL footage in an NTSC comp and expect everything to match up. It doesn't work that way. So look at the two alternatives above and pick your poison.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Roberto De JesusRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 9:53:39 pm

I was pretty sure I was being a bit naive on the PAL to NTSC conversion being that easy.

But thanks for your patience...

R

PS

and YES! they are anything BUT free -- ugh! -- re-budget


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Walter SoykaRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 9:59:15 pm

[Roberto De Jesus] "YES! they are anything BUT free -- ugh! -- re-budget"

If you are going to re-budget anyway... send the footage to a post house with an Alchemist or a Teranex to do the standards conversion the right way.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Chris WrightRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 10:40:42 pm

actually going from a 25 fps to a 29.97 de-interlaced is hard because you're going from 50 fields down to 29.97 frames.

A free solution is to timewarp pixel motion at 50%, precomp that then timestretch the precomp 50%. Then simply render out without any stutter.

And don't forget to have output module set to NTSC color!

here's an example ae cs3 aep that will fix framerate, color profiles, and size.

http://www.megaupload.com/?d=0UZM6MBH

http://technicolorsoftware.hostzi.com/


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Walter SoykaRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 9:51:43 pm

You could just turn frame blending on. Traditional frame blending will err on the soft side; pixel motion will err on the globby side. As Dave mentions, there are third-party tools which offer more control.

Andrew Kramer released a frame rate converter a couple years ago, but I've never used it myself.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Roberto De JesusRe: Pulsing image when converting Pal to NTSC
by on Sep 1, 2010 at 10:05:34 pm

I think I might go the Alchemist way cuz Kramer's software is off the budget cap as well.

Thanks so much though.

Great help!

First time trying this site out and really happy with the outcome.

R


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