Split screen frame jumpiness/edge jitter

[Angelo Lorenzo]

First issue, do you see this at “even” zoom levels like 100%, 50%, 25%? It may be jitter introduced by the viewer window scaling the overall comp. Also look for errant keyframes or incorrect keyframe momentum.

In terms of a 9 video comp skipping… are you seeing this in the render? I can only assume it’s a video throughput issue if the video resides on a single disk and not an array.

Angelo Lorenzo
Fallen Empire – Digital Production Services

[John Titor]

No, it seems to be present at any level of zoom. In relation to the frame skipping, it only happens in two or three of the shots and I think it’s basically a video render issue from AE. The edge jitter only occurs in AE renders, not premiere renders so I would assume that the frame jumping is related. With respect to file specs, it’s 1920×1080, frame rate for the footage is 29.97, progressive scan, all the footage is the same, I don’t know what colour space it’s in, I’ve looked at the render settings in AE to make sure that they’re the same. I’m rendering from AE as I want to apply a colour grade to the footage.

[John Titor]

Hmm, it seems to be nothing to do with the sequence being imported direct from the Premiere file into AE, given that I rendered out an uncompressed version of the sequence from Premiere and have the same problem.

[Jon Barrie]

Can you post a sample of what it looks like please 🙂

I don’t know if 29.97fps at Progressive is causing the issue, since that frame rate is technically for Interlaced whereas Progressive should be set at 30fps.

Could also have something to do with any deinterlacing performed on 60i material… Seeing it would really help narrow down the possibilites.

Cheers JB

Jon Barrie
Adobe Video Solutions Consultant ANZ
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