1080 over 60i slow motion?

E

eyeBOX

Active member
Greetings!

This question may have been asked in previous postings; however, I have not been able to find a suitable answer.

situation:

I want to shoot 1080i60 to drop into a 720pn24 (HVX-200) timeline to create slow motion video. The reasoning behind shooting 1080i is to be able to smooth out bumpy footage without degrading image quality. I understand that in order to get in-camera slow motion, one must be in 720pn24 and change the frame rate accordingly (48fps would give you 50% playback speed). I suppose what is really not understood here is the trade-off (or difference in quality) between de-interlaced, "smooth-cam'd" 1080i60 to 720p24 and "smooth-cam'd" 720pn24 shot at 60fps. Would it look worse- to stretch the 720p video for smooth-cam, or to de-interlace 1080i and down-rez to 720?

FCP 5
HVX-200
Shake

I know the question above is quite convoluted, but I don't know how else to put it.. Has anyone else gained experience in this area? And seriously, any constructive input is greatly appreciated.


Much thanks,
Patrick
 
Uh... well... interesting conundrum.

If it was me I'd just shoot 720pN at 60fps and be done with it.

Here's the thing -- if you try to use 1080/60i, you'll have to de-interlace it to create a pseudo 1080/60p. And it will be at much lower resolution, maybe 400 lines total, on each field. So you'll have 1280x400p, which you would then plan on zooming into to have handles for stabilization, right? Whereas if you shot 720/60p, you'd have 960x720 of full res. You'd lose a little horizontally but gain nearly double vertically. You could de-shake that and then blow it up a little to fill the frame and probably still be as sharp or sharper, would be my guess.

But the ultimate solution is for you to just try it. Shoot some shaky footage in each mode, bring it into your NLE, de-shake it, blow up the 720p to fill the frame, and see which looks more appealing to you. I suspect the 720p will look better, but the only way to know for sure is to try it.
 
I just did a small experiment with the xha1 (hdv), any ways, I captured with adobe, then dropped the 60i clip on a 24f timeline, then slowed it 40%. remove frame blending, and check the always deintelace choice, when you click on fame options. It was smooth as can be.

Another way, I tried to use avsynth to convert from 60i to 60p, But it was going to take hrs to convert the clip. I may have done something wrong. But the top version was fast and esay, plus it gave nice looking slow mo.
 
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