object vs Fast Forward

J

joelu

Member
again, don't know the name of it.
i often see commercial / film has such shot, that main char. standing on the street with normal speed, the rest of ppl walking around him/her are 300% more fast forwarded.
is this done by digital effects? or done by the camera? or the combination?
a detail explanation will be much appreciated

thanks
 
Either the person is walking reeeeaaaaallllllllllyyyyyy slow so when its speeded up in post it looks normal.

Or they're using a motion-control camera and made two passes -- one with only the ppl, and one with only him/her. The two shots are composited in post, with the ppl shot speeded up (or if shot on film, they would have used a lower fps rate).

If you lock the camera down, you don't need motion control -- but usually when I see this effect (in music videos mostly) its done with motion control.

I think the hardest part would be blocking-off the sidewalk so that nobody walks into the shot of just him/her walking normally (which is probably why motion control is used -- so they can do the walking-shot in a studio with a greenscreen.)
 
Greenscreen then most likely...just direct where the other people are stepping so it doesnt seem like they walking thru the person...then jus put the greenscreen shot in.
 
Jamison said:
how do you composite 2 shots together? With out getting the fading look?
Click to expand...

In Vegas? You'll need to change the type of compositing -- I'm not sure to which one, but there's many to choose from.

However for the best results you'll probably want to use compositing software -- I use Shake. I haven't done this particular effect, only read about it. In Shake you can take two images and automatically remove the common background from one of them so you only get the moving bits (called a "travelling matte").
 
pmark23 mentioned going REALLY slow for your main character as an option. This would be extremely difficult as most people aren't going to have the control to not make SOME motion slightly faster than the others, which when speeded up 300% is going to give you an unnatural jerky look ... I've tried.

If you're using a green screen effect, don't forget about your masking effect if you want to give it a realistic look with people walking in front of the character as well.
 
Envision said:
pmark23 mentioned going REALLY slow for your main character as an option. This would be extremely difficult as most people aren't going to have the control to not make SOME motion slightly faster than the others, which when speeded up 300% is going to give you an unnatural jerky look ... I've tried.
Click to expand...

There was a popular video done about 5 or more years ago that did this. I forget the artist, but it had this person (woman) walking around a fast-moving London. It looked quite cheesy (for the reasons Envision mentions -- mainly jerkiness), but worked for the video.

At the same time, Spice Girls had a video (also shot in London) that was done using a sweet home-built motion control rig. BTW: My watching of a Spice Girls video was strictly professional. Honest!
 
What exactly is a motion control rig? Just something that makes a camera follow the exact same path/speed over again?
 
Envision said:
If you're using a green screen effect, don't forget about your masking effect if you want to give it a realistic look with people walking in front of the character as well.
Click to expand...

what the mask can help in this particular case? in order to make a realistic look by having ppl walking infront of the characer, (not horizontally, but vertically) how do i make it done in vegas? or is it even possible? the "Shake Software" is any good about this?
 
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