Log in

View Full Version : How to fix "wobbling" frames?


Corpsecreate
28th February 2012, 04:54
I'm not sure if there is an official name for this problem but what I have is a case where the frames "wobble". I've taken a clip from Dragon Ball Z Kai and you can see what I mean here:

http://www.mediafire.com/?qkp7atuaemh3zpb (1MB)

The problem is most noticeable from 0:02 to 0:13. There are instances that are worse than this and if I can find them I'll upload them if this video isn't enough to see what I'm talking about. Is there any avisynth filter that can remove or at least partially fix this problem?

ajk
28th February 2012, 07:29
Seems like "gate weave" or "telecine wobble", where the consecutive film frames move around slightly in the projector (or even camera). The function Stab() (http://avisynth.org/mediawiki/Stab) should work reasonably well for this.

Corpsecreate
28th February 2012, 12:17
I appreciate the response, however this video has already had Stab() applied to it. It did fix the jitter that was originally there but it didn't help with the "wobbling" that is still present. I mean its not a particularly big deal if this can't be fixed but I thought it would be worth asking. Ill search for some scenes where this problem is more apparent.

ajk
28th February 2012, 13:42
Upon closer inspection it looks like the frames have uneven geometric distortion, ie. the film is stretched/shrunk. Stab() has centered them overall as well as it can. In principle it should be possible to analyse the motion and un-distort the images, but i don't know if anything exists for AviSynth. Perhaps a strong-ish temporal blur would at least make the jitter less noticeable? Or some kind of motion masked Dup()? :)