Jumpy, Stuttery Playback on Timeline and in .mov Render

[Steve Roberts]

Uh oh. Did you try searching the COW for “judder”?

The problem may be the optical illusion of regular-shaped objects moving across the screen at a regular rate.

Anyway, try the search.

[Nick Pitcavage]

Thanks Dave and Steve, I’ve been researching this all day, and did come across the “judder” info. I am just now getting into that.

Is there a “quick an easy” to make the objects seem smooth (to combat the judder)?

I usually use PhotoJpg at about 65%. My final output is to a projector in an auditorium, so, quality is important, but the screens are a little more forgiving than LCD or Plasma.

[Nick Pitcavage]

I see, so it comes down to finding a speed for the horizontal animation, that looks smooth on playback?

My final output is on projector screens, via Pro Video Player, Pro Video Sync and a Spyder system. The software bundle handles .mov files and allows you to play them on a “playlist” and it allows you to arrange video creatively on multiple screens.

https://vistasystems.net/product_tour.asp
https://www.renewedvision.com/pvs.php

I’m going to keep researching on this and try to find a solution.

[Nick Pitcavage]

I am using 29.97 Progressive because that is the frame rate of the EX cams we shoot with.

Maybe I am doing something wrong when I export interlaced renders, but it is always glaringly obvious that the frames are interlaced.

I am currently exporting a version with motion blur to see if that helps at all.

[Steve Roberts]

Does the client notice the judder?

… with interlacing, there’s one way to do it right (no scaling, correct field order, proper frame size, proper frame rate) and, I suppose, four ways to do it wrong:
-scale after interlacing (get lines of varying thickness)
– wrong field order (test in AE by opt-clicking in Proj window, then viewing with PageDn key — shouldn’t jump back & forth)
– wrong frame size (should be 720×486 non-square PAR, 1020×1080, square PAR)
– wrong frame rate (should be 29.97 for NTSC)

If they look obviously interlaced to you, maybe you just have a really good eye. 🙂 Or maybe you’re not viewing it on an interlaced monitor? The latter would show a freeze-frame as a flicker, while a computer monitor would show it as “comb” lines (in AE, you’d only see them if you didn’t separate fields on import).

Does that help?

[Nick Pitcavage]

ya, it helps. the reason I see the interlacing is because I have 1080 LCD monitors. I am not sure how obvious the interlacing would be on the projector screens, projecting through HD projectors, but maybe that will be the next test.

I can illuminate the scaling of the media, and frame rate for sure. But the frame size…? I am using 1920 X 1080.

I will check the field order.

[Steve Roberts]

Sorry — you have the right frame size at 1920×1080. Mine was a typo.