Motion Blur Seams

Is Motion Blur broken? When rendering 3D surfaces with Motion Blur I get visible seams.
Example - 2 same-colored Solids, butted up against each other without a gap look like one big Solid. But if the camera zooms by the seam between the two Solids becomes visible ... the blurred area becomes less than 100% opaque.
I thought of the CC Force Motion Blur but the render times for my HD comp are insane.
I know this is comparing apples to oranges, but if I perform the same setup (2 planes, moving camera, motion blur) in Softimage, mentalray blurs plane 1 into plane 2 but never 'reveals' the seam with a decrease in opacity.
I tried changing the Renderer but the only option now is "Advanced".
Thanks

This is just an artifact of how motion blur is calculated in AE. In real life, motion blur happens to the entire image as seen by the eye or the camera. In AE, on the other hand, each layer is blurred separately for efficiency. It's just as if you place two layers side-by-side with their edges meeting, and applied a blur to each layer. You'd get a transparent seam where the blurs overlap, since each layers' pixels are at less than 100% opacity. You can get even uglier artifacts in some cases when a 3D layer's motion blur actually intersects with a layer that would otherwise obscure that blurred layer. Layers can even appear to render out of order in some cases, thanks to this phenomenon.
If precomposing isn't possible the only way to work around this problem (other than resorting to using something like Force Motion Blur on your entire comp) is to add a layer behind the seam to create the illusion of a continuous surface. It can be really tricky, but it is possible to make it look more natural.

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Motion blur revisited

Hi,
I am trying to create motion blur to protect my clients' identity in videos that I create to analyze their motion so that I can elicit other opinions. I'm using iMovie '09 as my editior and understand that it doesn't accept plugins. I have seen other solutions requiring a purchase of Final Cut Studio, Sony Vegas, or Adobe Premiere. I don't own any other graphics editior programs and am on a limited budget. Besides trimming frames, this is the only additional feature that I need. Does anyone have any suggestions on a cost-effective way to do this without requring too many steps?
With will & interest,
TJ.

This is just an artifact of how motion blur is calculated in AE. In real life, motion blur happens to the entire image as seen by the eye or the camera. In AE, on the other hand, each layer is blurred separately for efficiency. It's just as if you place two layers side-by-side with their edges meeting, and applied a blur to each layer. You'd get a transparent seam where the blurs overlap, since each layers' pixels are at less than 100% opacity. You can get even uglier artifacts in some cases when a 3D layer's motion blur actually intersects with a layer that would otherwise obscure that blurred layer. Layers can even appear to render out of order in some cases, thanks to this phenomenon.
If precomposing isn't possible the only way to work around this problem (other than resorting to using something like Force Motion Blur on your entire comp) is to add a layer behind the seam to create the illusion of a continuous surface. It can be really tricky, but it is possible to make it look more natural.

Motion Blur help.

Alrighty, I'm using Photoshop CS4 Extended, and I'm having troubles with motion blur.
When I set the angle to anything above 60 really and distance to about 300 it crashes saying Adobe Photoshop CS4 has encountered a problem and needs to close.
This happens every time. So I tried restarting Photoshop, then restarting my computer, then I uninstalled and reinstalled fresh and it still crashes when I begin to use motion blur, infact I believe it even crashed just by opening the motion blur window for over 40 seconds.
Any help or ideas?
Thanks in advance!

Thanks a lot Mylenium! I'll do that in a few minutes, by the way heres an update with some more information.
Photoshop crashes when I change the angle to 49 or higher, anything lower is fine.
I went to my event viewer and I found this:
Faulting application photoshop.exe, version 11.0.0.0, faulting module mmxcore.8bx, version 11.0.0.0, fault address 0x0000d62a.

My text moves to the wrong place when I apply motion blur!

Hello friends! thanks in advance for any able to solve my problem. when ever I apply motion blur to moving text it repositions the text permanently.... I have to delete the motion blur effect in order to have it text stay on course...any suggestions?

"Delete the motion blur effect"? Sounds like you are applying an effect, rather than turning on motion blur.
Please provide a detailed explanation of the process that causes the problem. If possible, post a screengrab as well.
Note that Motion Blur, at its core, does alter the position of animation by blurring the disnace between two moments in time. When you activate motion blur, it samples the position of your text at multiple points in time to create the illusion of motion blur. If your text is moving very fast, the results can be surprisingly major.

How do I select an image with motion blur so that I can put it onto a different background ?

How do I overlay a image with motion blur on a white background (like the first image) onto a different background (to look like the second image)? any help would be greatly appreciated, many thanks ,ed
Message was edited by: motoredd

I’m afraid you may have bitten off more than you might want to chew.
The resulting pixels of an in-camera-blur combine information about the color/brightness of back- and foreground (edit: the result of surface properties and lighting conditions) with motion (basically transparency for this task) in such a way that it seems exceedingly difficult (maybe even improssible) to isolate the foreground in a »pure« form.
One may get a halfway decent mask (as the backgound is at least almost uniform and brighter than the foreground elements) but you may have to manually decontaminate the transparent areas, otherwise the masked object in front of a dark background would have a bright edge.

Motion Blur doesn't work in Final Cut Pro

I've been working on stuff and int he past Motion Blur worked and now when I use it the motion blur has refused to work as a preview or after I render it. Is there something i'm doing wrong that's making it happen?
I'm using Mac OS X Leopard, the latest final cut pro and i'm using blue and green screen and Chroma Keyer and image control sinc ei'm making a sillouette and it's worked for me before.
If someone can reply and suggest anything that would be awseome.

Does your object to be blurred actually move...if not then use a blur filter
When you check the motion blur box and click the disclosure triangle what is the Blur percentage? did you try increasing it? If so does it make a difference?

How to add motion blur to the shatter effect?

I am trying to add motion blur to the shatter effect, iv created my own custom shatter map with text that remains after the effect is complete, i have tried to add motion blur through the other blur effects and i have not found one that will do the motion blur correctly.
what im wanting is for there to be motion blur on the pieces that are shattering, any suggestions?

There are suggestions toward the bottom of this page, including a tip using the Timewarp effect. I found this by searching for 'motion blur'.

Imported video has "motion-blur" artifacts, but original is fine.

Hi,
I've just purchased a Samsung SMX-F30 standard-def camcorder. I've shot a few clips and decided to test its compatibility with iMovie. iMovie recognised the camcorder with no problems and imported all my clips without any hassle. However, when I play the clips in iMovie if the clip has any motion, say an arm or hand being waved or head moving, then the image blurs in a way I can only describe as "interlace staggering". That is, alternate lines in the fram shift position left and right alternately. This is really annoying as you can imagine!
A few details about my setup other than the machine details below:
Clips recorded in 4:3
iMovie defaults when importing
iMovie version is 8.0.2 (I think)
iMovie imports to an external firewire 500GB hard drive
Clips not analysed for stabilisation after import
Camera records in "H.264/AVC Format" according to the manual
Recording at approx 5Mbps
Camera was using built-in electronic anti-shake
I hope someone can suggest a few things to try as I've just returned to movie making after owning a Mini-DV based camcorder 10 years ago!
Thanks
Stuart

His book gives specific directions and more info on AVCHD with frame rates and bits...so definately buy the book. Your question: It kinda depends on your set up. Many people need to import into imovie 9 just so they can get an editable copy of the footage. So then you make your way over to the events folder and import the events into another program for turning it into progressive and de-interlacing it. You have to becareful because you will have duplicate footage.
He goes into details on how to do this. I have a different workflow because i import on a different machine using imovie6 since i am working with tapes. Then i convert it before i import it again into imovie. My DV footage doesn't get motion blur though so i am only doing this workflow to ensure no quality loss.

Motion blur is messing up my composition

Hey all,
I'm working on a project which involves 3d space (using camera tracker). Everything is going fine until I needed to turn on motion blur for a layer. When i switched it on for the composition, things start to get weird. If you play the video, the null objects visibly "rotate" instantly, move from spot to spot randomly, and it's obvious that something is not right. When i turn off the motion blur, the object right themselves.
Does anyone have any suggestions? I think i can work through it by creating a new composition then dropping the existing into that and turning on motion blur there, but i would rather be able to work with it in the same comp.
I'm working with 1920x1080p footage 30 fps in CS5.5 on a macbook pro 2.52ghz intel core 2 duo. If you need any other info just let me know.
Thanks
Dan

OK, here's my best guess. When you turn on motion blur time samples differently. The keyframes that are causing the problems are at a z rotation for the camera of 179º. This made me think you were experiencing a gimbal lock with your camera moves. When the camera gimbal locks the camera orientation flips. It has nothing to do with motion blur being enabled on the layers.
I seldom apply tracking data directly to a camera for this reason. I almost always apply the tracking data to a null then parent the camera to the null. This will prevent gimbal lock problems with the camera.
There is a solution that may work for you. Open up the composition settings, the Advanced tab and change the Shutter phase to 0º. This should prevent the gimbal lock that you're getting. I wouldn't call this a bug, but a better workflow would have prevented the problem in the first place.

The fastest/easiest way to Motion Blur in Flash CS4

MotionBlur details and download available here:
http://ajarproductions.com/blog/2009/03/02/new-flash-extension-motionblur/
If you need to motion blur in a previous version of Flash, I
highly recommend this article:
http://www.adobe.com/devnet/flash/articles/motion_blur.html

In Preview open the picture. In the toolbar at the topp of the picture window. pick Select a drop down window should appear and *Instant Alpha* is at the bottom of the drop down window.

Activating 3d for a layer effects motion blur strangely

Hello all
I have a comp in which a jpg logo moves quickly across frame into position, I have motion blur enabled for the composition and the layer and it works fine. I would now like to do more work on the composition that involves camera moves so I have enabled 3d for the layer containing the logo and my motion blur, well, doesn't dissapear exactly but neither does it stay.
I have a couple of images here to explain better...
http://www.tinycards.co.uk/aftereffects
sorry if this is a stupid mistake!
many thanks

ok half fixed it myself, I discovered the "samples per frame" setting in advanced composition settings
if I set this at 35-40 I get a nice smooth blur.
I have a smaller problem now however ,the 3d version is brighter than the 2d version, I assume this is because of the composite mode it uses to merge the 40 or so frames to make the blur. Is there any way of controlling this accurately?
Also does anyone know why motion blur sample rate is automatic in 2d and not 3d?

Motion blur options?

Hello!
I'm working on a new project. Footage is being recorded from a game at 300 fps (then resampled to 30). I'd like to achieve the same motion blur as for footage take with a normal camera. I tried a few things but I'd like to see if there are some other options:
Plain frame blending from framerate resampling from 300 to 30.
Reel Smart Motion Blur plug-in without frame blend switch on. Looks pretty decent at first sight and renders reasonably fast. But under closer inspection it shows a lot of incorrect interpolation at a lot of elements.
Reel Smart Motion Blur plug-in with frame blending switch on. Similar to the previous example.
CC Force Motion Blur plug-in with interpolation switch on. Produces a great result at a cost of really long render times. Also i have no idea where to set the shutter phase (native shutter and interpolating dont work together?).
Are there any other options?
Thanks a bunch.

Hey guys,
its been a while and Im playing around with motion blur of high fps footage again.
I've tried the effect CC Wide Time which blends a designated number of frames before and after the current frame.
I have footage recorded at 1000 fps. In comparison frame mix would blend 40 frames into a single frame (1000 fps to 25 fps) which would represent a shutter angle of 180° (i believe). That doesn't look smooth enough in my mind, so in CC Wide Time i set the values to 80 frames total (39 ahead, 40 behind, 1 current just to be accurate ), which represents the shutter angle of 360° with a phase of -180°.
Now the problem is that i would like to time remap the clip. After a precomp i time stretch the clip to obtain the real life time scale - 1000 fps to 25 fps, with the motion blur i describe above. If i enable time remap and start playing with slowmotion the intensity of motion blur intesity (blurred frames) stays the same, which isnt right. A way to fix that would be to use a linear 40 -> 0 frames blended corresponding to the velocity achieved by timeremaping, but i cant seem to find a way to use clip velocity in expressions.
I could use timewarp and use speed value instead of time remap, but that seems like a pain especially when i think of applying ease to the keyframes.
To think all of this could be avoided if CC Force Motion Blur would offer shutter phase.
Any thoughts on the issue?
Thanks!

CS4 Export: Motion Blur problem.

Hi,
I'm having problems exporting a bunch of sequences to h264. Source files are MPEG2, sequence is DV, export is h264 through Adobe Media Encoder. For some reason, the exported video has weird motion blur, but that effect is not added to the videos. All I did was level the audio and export. What could be wrong? Known bug, perhaps?
Any help appreciated. Thanks.

Had the same problem as well. Did some experiment on it and managed to solve it on CS4.
Select entire clip in the timeline
Right click on the clips and uncheck "Frame Blend"
Then export it.
It works for me... hope it does for u too.
Cheers

MOTION BLUR & LIP SYNC PROBLEM

This problem is with encoding in CS5.
Using Encore to make a DVD I had to Transcode all my assets because of the "end of file" error
on doing this I had 7 clips out of 18 with either motion blur (may be jitter) and audio out of sync with the video but not on all of them.
Then I re encoded my originals in Prem Pro using different settings but still the same problem.
Your help would be appreciated
johnacs5

Hi Jim & sellador,
As I am from England all my work is PAL 25 fps
This particular clip has the worst blur or jitter quite painful to watch. Oddly enough plays fine on the time line or viewer but not in WMP or DVD on computer or television (this must tell us something)
I have now done over 20 different outputs the best being de interlace no blur but the quality suffered.
Right some info:
Material, Original clip as shown in adobe properties: mpeg - 25fps Aspect 4:3 1.094 pixel
720 x 576 - Upper field first - average bit rate 871kb/s - Audio 48k
Sequence settings: DV PAL upper field first - 25fps - 1.094 pixel - Audio 48k
Export settings: MPEG2 - Custom - 720 x 576 - pixel 1.094 - upper field first
Profile Main - level Main. - Max render Quality - 6.5 - 8.5 mb/s
Gop 3 & 12
johnacs5

Motion Blur

I have created a dvd (to be played on a TV) as I was viewing it a few of the clips had motion blur. What cause this? How do I fix this problem? Does it stem all the way back to how I imported it into Final cut express or exported it?

When you say "motion blur" is this what you mean? http://support.apple.com/kb/TA22228
You should also look at iDVD 7.0: Burned DVD has interlacing, pixelation, or image quality issues http://support.apple.com/kb/HT4078

Motion Blur Seams

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