Try Pixelan for a plugin that will do this for you.

Is this the sort of effect you're describing?

http://effectv.sourceforge.net/streak.html

Perhaps not but that you can do with Vegas using Motion Blur. Shooting initially with a fast shutter speed will really highlight that effect.

Bob.

Sami
Take at look at Pixelan Cretive Ease. You'll find some video samples here:

http://www.pixelan.com/ce/movies.htm

You probably want something like the StepMotion 2 Effect. You should also watch the StepTime 2 Effect.

Jøran Toresen

Take a video clip and put it on a track, we'll call this the "master" track. Now, add another track above the master track and add the same clip but slip it to the right by 15 frames or so. Add another track and place the same clip again and slip it 30 frames this time. Repeat the process as many times as you want. Then adjust the "Level" slider on each of the slipped tracks to 50% or so, this makes the tracks transparent. You can play around with adding more tracks, slipping them different amounts and changing the level (transparency) on each track to get the effect you want.

to add on to that, biezer curves in the pan/crop could be really really useful. Then only parts do the stop-motion.

Excalibur also has the "Stutter" tool which performs this function similar to how John described doing it manually.

thanks for all the suggestions! None of those do exactly what Im looking for. John suggestion comes close.

What Im looking for is to achieve that the first frame stays there forever (like a still image) and when the second frame appears it stays there forever. Until the picture is all white Like a long exposure with someone moving and you see the trails.

I could do it by hand but it's gonna take days since its 4 minutes clip and and that means 6000 frames :) I wonder if my computer would run 6000 video tracks :D

Sami

I know EXACTLY what you mean! HELL'S Teeth!!! - You are gonna have me awake all-friggin-nite now!! Propably along with some others around the Planet too . .

Hmmmm... nice problem . .

I think what he's asking for is Video Feedback. Was popular back in the 70s. You'd point a camera at a monitor and get exactly what he's describing depending how you moved the camera around.

As I said up the top, I did ask about this a long time ago, seems no one has ever cracked this in the digital realm. Might be doable in AE using expressions.

One possible solution would be to recursively nest two Vegas projects. Project A nests Project B which is nesting A like a snake eating its tail. I suspect though as you would have no way of controlling the interations you'd cause Vegas to blowup as you'd create an infinite instances of Vegas.

If all else fails, you could do it the way it was originally done, point a camera at a monitor. However even then trying to accumulate 6,000 frames I can't see happening, 100 maybe.

Even using the track stacking method that John suggested when you add more than a few frame together you'd get white as the noise in the blacks adds.

Bob.

What about a script?
Take screen grab, set to buffer A. Next frame. Store to B. At 50% transparency, then merge A + B and turn into A. Repeat/iterate onwards
(I don't know - just seems mathematically easy, damned if I know any better in real world)

http://www.medienkunstnetz.de/works/illuminated-average/

Thats what Im looking for in a still image. I would just like to do that as a moving image starting from the first frame and ending up like that.

Sami

So do you think I could do this is in After Effects?

Sami

Sami? What am I supposed to be seeing when I'm looking at that link? It looks just like a piece of the Turin Shroud? - I don't get it? - Sorry .. G

OK,
I get it. Need to read the description beside the linked image.

Whereas that's an additive composite of all the frame in the scence into one frame Essami wants to have a video where you see the gradual build up of the final image. In other words the movement of say the talent paints a single frame, something like this:

Frame 1b = Frame 1a
Farme 2b = Farme 1a+Frame 2a
Frame 3b = Frame 1a+Frame 2a + Frame 3a
etc.

Where b is your output and a is your original video frames.
As you can see using stepped tracks in Vegas if the video is n frame long you need n tracks.

However this:
Frame 1b = Frame 1a
Frame 2b = Frame 1b + Frame 2a
Frame 3b = Frame 2b + Frame 3a
etc
is much more manageable except I don't think Vegas will let a script do this.
One solution would be to use Photoshop.
Export an image sequence and then use a script in PS to process the frames into another folder using the second method I outlined above. That avoids ending up with much the same problems as you'd get int Vegas except you'd have n layers.

The other thing you need to watch is the compositing mode, burn might be your best bet. Otherwise the blacks and lowlights will just get brighter as the levels add and turn to white.

Bob.

I was wondering about blacks/whites too. I came up with a different direction. Say film is 20 frames. Then it takes 20 frames to get to white. Therefore, each frame is converted to 1/20th hue/saturation. After that, simply additive sequence with next frame. Consitatnyl dark areas would remain dark, light areas become light nd so forth

[hands very cold - hard typing]

also, just thinking. a frame per second would reduce the workload a lot, and still get close to the finished article.

Almost but not quite. The first frame would be almost black, moreso if there were 6,000 frames. What you want is only the highlights to add which is what happens when you expose film multiple times.

Bob.

farss! You got it! Excellent idea to do it in Photoshop! I think this is definately what Im gonna try and do with this.

The image I have is a person moving very slowly in the center of the image (shot 50fps) and everything else except her face is dark. So she kind of paints most of the frame white very slowly during 4 minutes.

Thanks so much people! I will post results if I ever get them :) I must say the EX1 and Letus Extreme have made my productivity go up the roof.

Sami