hvx timelapse

J

jeeyof

Member
hey guys,

i would like to get some advice on timelapse. i am trying to get a night traffic timelapse, except instead of having that fast strobey effect, i would like to get th effect of havin the cars lights to look like a long beam of lights. i guess thats has somethin to do with exposure time? can anybody help with with the settings? all help will be appreciated. thanks
 
The best you can do, in camera, is 2 frames per second with a 1/2 second shutter (350 degrees). In order to do this you must us the HVX frame rate hack to get the 2 FPS you need for 1/2 second shutter speed. There is a good tutorial on the hack on youtube, search "HVX frame rate hack".

This will give you a lot more motion blur than 1/12 or 1/15 shutter, which is the longest shutter the camera can do "stock". But if you find it is not enough you may need to add more blur in post.

I think you will be satisfied with 1/2 shutter though. I have shot a bit using the hack and am very impressed with it.

JP
 
Yes, shoot with the 2fps hack, then take it into after effects... try layering the footage over itself, shifted a frame, and using an additive blending mode like "screen" "add" or similar (you'll have to experiment). Then tweak your levels so that black stays black, and speed it up 2x.

If you shift one frame, your footage should look almost exactly like it was shot at 1fps. If you repeat this with a third layer, you can get to .667 fps (speed it up to 3x) etc.

I think there is a way to do this more simply, or at least there was. Maybe it was the "posterize time" option... or something else. Maybe someone else knows what I'm talking about?
 
ProfessorU said:
Yes, shoot with the 2fps hack, then take it into after effects... try layering the footage over itself, shifted a frame, and using an additive blending mode like "screen" "add" or similar (you'll have to experiment). Then tweak your levels so that black stays black, and speed it up 2x.
Click to expand...

It would seem that to get the streaks of light he wants, he would need an exposure of several seconds and not just fractions of a second.
 
Spyke, every time you added a layer, you'd be adding half a second of exposure, so if you wanted to simulate three seconds of exposure, you'd need a total of six layers.
 
It also depends on the speed of the object you're filming. Traffic on a highway is going to create a much longer streak with the 2fps hack as opposed to traffic moving on a residential street.
I've done some with the hack where the streak is pretty long using interstate traffic but if he wants to have a long ribbon of light effect, he's going to either have to use a DSLR or use ProfessorU's method or something similar.
 
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