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Video “stutters” during motion sequences
As the title says, i get a very ugly stutter in my movies when moving (scrolling along) large images over the screen (640×480 @ 30fps).
Now i understand that this might be very hardware intense and not work in a preview, but i’m very disappointed that it happens after rendering out a sequence. After all AE has all the time to calculate it properly.
Could this be related to interpolated float-point positions, where AE isn’t sure whether to jump to the next pixel? I’m pretty sure i have ruled out video bitrate, as it happens at even the smallest videos with ridiculous bandwidth at disposal. This also rules out too slow graphics card performance.
I should mention that it doesn’t happen everywhere in the video, but at distinctive points during a motion sequence. I saw a post about “juddering” on this board, but wouldn’t that happen on every frame during linear motion?
Anyway, it’s greatly degrading the viewing experience and i’m hoping to find some ideas here.
Thanks,
Adrian -
2 Replies
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AE uses sub-pixel positioning when at high (not draft) quality. You’d notice draft quality — it’s in the Render Settings. So that’s not the problem.
Are your videos compressed or not? If compressed, what is the codec?
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Thanks for your responses gentlemen.
I use RAM previewing as the reference. I have to correct myself on the panning judder within AE, which is in fact just a small “step” moving from bottom to top every few seconds. Could even be a video acceleration side effect for all i know.
I experimented with a couple more formats and monitored the disk I/O, which peaked at about 3MB, so my generic 7200rpm drive with 8MB cache should handle that.
Turns out frame rate is the issue, and the 30fps is right at the limit where it becomes visible. So “video judder” it is, blimey!
Video Test at 30fps and then 25fps.
If i want to have this on Youtube, i guess i’ll have to sacrifice the fast panning sequences.
Adrian
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