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The Dalsa Origin can only go as high as 32fps, but the SI-2K seems to be the winner with a max of 72fps in 720P mode. 1080i and 1080PsF cameras generally only have a maximum framerate of 30fps because of the restrictions of 60i (even though some filmmakers have successfully used 1080i60 HDCAM for slow-mo ie:Once Upon A Time in Mexico) The F350 XDCAM HD is the exception and can go as high as "60P" but I think Sony does this by using a single field of 1080i leaving you with 540 lines (Nate, can you please confirm this?) There are hi-speed CCD/CMOS alternatives to hi-speed film cameras, but these are usually specially designed for research and need to be attached to a computer for direct capture to hard drive. Dalsa makes some hi-def chips/cameras that can capture 100fps. I have seen footage from some hi-speed research CCD cameras that can capture as many as 1000fps! The bottom line is that contrary to popular belief, film is far from dead. If you are shooting action scenes and want frame rates higher than 60, your film options are:
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The calculation of perceived speed is playback speed divided by camera speed. In this case 24 divided by 60 = 40% Therefore shooting 60P and playing back at 24P is 40% speed of 'real-time', shooting 50P and playing back at 24P (or 25P) is around 50% speed. Quote:
When you speak of 12fps in the Varicam and HVX200 you are referring to "undercranking" or "fast-motion." It is very easy to undercrank at 12fps on the HD100 by setting the shutter to 1/24th (for equivalent 180° shutter,) shoot in 24P, and then speed the clip up in post by 200%. This will effectively drop every other frame and you will have under-cranked footage shot at 12fps! Think "Keystone Cops." |
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A few years ago I saw a demo at IMAX head office of some motion interpolation software they were working on to create smooth slow motion in post production. It was quite convincing - I wonder if they ever went anywhere with it? It still not as ideal as overcranking, but works in a pinch. |
Is it just me or is the kung-fu clip really soft? The juggling clip looks good (if a bit dark) but the kung-fu looks like upconverted SD to me.
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thanks for posting the m2t file, it gave me the chance to do a test. im in europe working with pc and was wondering how to crank with edius pro.
opened a 720p 25 project, imported the m2t file into edius changed the framerate of the 60p clip to 25 in the clip property window, put it on the timeline, voila, nice slowmo. i'm very excited! expect to get the hd200 this week. Thomas |
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Also I heard that when shooting a music video (on film-mostily) they spreed up the music on the set by 20% shoot the video in 30fps and then in post (editing it in 24fps) they slow the hole video down, about 20% so they keep lip-sync but get a nice dreamlike effect. Has any one done that with the JVC cam. or a HDV cam. for that matter. Sorry about my spelling, I come from a land far far away. |
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I know the math doesn't seem to make sense at first glance, but here's how it works. 30 ÷ 24 = 125% (speed your soundtrack up 25% for on-set playback.) 24 ÷ 30 = 80% (slow your 30P footage down to 80% speed to playback at 23.98fps. Perfect sync will be maintained.) If you really want to make it hard on performers, try running at 50P! The calculations aren't as clean because 50P actually is 50fps, but 24P is only 23.976. So... 50 ÷ 23.976 = 208.5% (speed the soundtrack up to 208.5% speed) 23.976 ÷ 50 = 47.95% (slow the footage down to 47.95% speed for 24P playback in perfect sync.) |
Pouring wine in slow motion - HD200 60P
Here is a test I did with my new 200!
Originally shot at 60p with the iris fully open and a 100/shutter. I've used aspect HD with Premiere so they are not native HDV files and then compressed to sorenson video 3 for web. http://www.andrewkramer.net/60pat24fps.mov This is 60p slowed to 24 frames per second. 47MBs http://www.andrewkramer.net/30ptest.mov This is 60p at 30p in real time. (no slow motion) 19MBs Process: 1. Filmed at 60p with shutter at 1/100 with aperature all the way open 2. (with aspect HD installed) created a new 60P project from the 24p 720p cineform preset and simply changed the frame rate to 60. I'm not sure if this is nenessary but I didn't see an option for 60p at 720p resolution. 3. Opened in After Effects and interpreted the footage as 24p and put on a 24p timeline. Thought I would share. |
Thanks Andrew. I'm going to append this to the stuck thread with the other slow-motion examples.
Can you please explain your process step by step? |
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