ramping hvx200

I think there's a trick where you can hack a Dance Dance Revolution foootstomp pad to work in place of the menu and record buttons, and if you're really good at DDR you can stop, switch frame rates, and start recording without a frame gap. Really good DDR players have been able to do this reliably at 24P, while it takes a really great player to do this in 30P, or at high overcrank rates. I know a guy Shiru who ramped smoothly from 12 fps to 60 and back down three times in a row!
 
hehehe, but actually, here in Copenhagen, I've hacked a Playstation karate interface, hooked it up to a mac and a camera, and turned it all into a dance machine that'll let children create their own music, record that music and themselves on camera plus greenscreen it with Arkaos video effects, finally burning it to a dvd they can take home to show mum and dad how they make their own music and video... so maybe I'll just do the DDR hack and call it the DDRAMP :grin: :grin:
 
Curious for more information about EVINSKY's suggestion...
Forgive me for asking the obvious, but would there be any resolution loss shooting 60P for 24 and then remapping in post? Sounds like this would give you a lot more options....but at what cost/drawbacks?
I can't seem to wrap around my head what would be the disadvantages of this method. (I've always been a video guy).
Thanks for any further information:-)

Brian Broz
 
Brian Broz said:
Curious for more information about EVINSKY's suggestion...
Forgive me for asking the obvious, but would there be any resolution loss shooting 60P for 24 and then remapping in post? Sounds like this would give you a lot more options....but at what cost/drawbacks?
I can't seem to wrap around my head what would be the disadvantages of this method. (I've always been a video guy).
Thanks for any further information:-)

Brian Broz
Click to expand...

The problem is motion blur due to shutter speeds. You would have to choose a shutter speed, say 1/120 second at 60p. OK now when you convert that 60p footage to 24p, it will look choppy (think a milder Saving Private Ryan look) then when it is ramped to 60p it will lose that feel and come to a much more natural slow motion. It is not so much a problem so much as a stylistic choice that is no longer a choice. Remember, when a true film frame rate ramping occurs (as we are used to seeing) they are using a very expensive machine that simultaneously adjusts fps, shutter speed and aperture- so that you get a nice even exposure all while maintaining frame rate to shutter speed ratios.
To sum up, I predict you will be seeing some very nice HVX footage that was ramped in post, and if used properly will be every bit as powerful as the traditional ramping. Imagine a scene that has that frantic feel that high shutter speeds cause, then the ramp occurs and everything slows down and smoothes out- it could be very nice, depending on the story.
 
seejay1031 said:
The problem is motion blur due to shutter speeds. You would have to choose a shutter speed, say 1/120 second at 60p. OK now when you convert that 60p footage to 24p, it will look choppy (think a milder Saving Private Ryan look) then when it is ramped to 60p it will lose that feel and come to a much more natural slow motion.
Click to expand...

How about using 360° shutter with 60p in-camera and adding more motion blur in the post when ramping down?
 
still wouldnt work right - lets say you remap to 30 frames/sec - every other frame is missing so that part of the motion blur is missing - i guess it might then be equivalent to a 180 degree shutter which is good in itself - but if you ramp, your effective shutter angle will change over time so the footage will get more or less choppy depending on the direction of the ramp. This is fine if you can incorporate that look creatively
 
60P at 350-degree shutter, played back at 200% speed, would provide an image nearly identical to 30p at 175-degree shutter.

As smelni said, the ramp won't look exactly like a proper ramp; shooting at 60hz just isn't the same as shooting at 48hz or 44hz or 41hz or any other speed between the start and end of the ramp. I mean you could probably make something that looks pretty good, but it will never look just like a real ramp from a film camera or varicam.
 
Have you guys ever increased motion blur in the post?
There are some really realistic options like foundry's plug-in for shake.

You could also shoot with fastest possible shutter speed that light level permits and add all motion blur in the post. Then the footage looks the same with all ramped speeds.
This is also a very handy way to deal with motion blur in chroma key shots.
 
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