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18 Replies Last post: Feb 7, 2007 2:47 PM by NicholasCox   1 2 Previous Next
Click to view Macworld.com's profile Enthusiast 1,900 posts since
Feb 6, 2004
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Jul 28, 2006 11:20 AM

Mac OS X Hints Weblog: Create time-lapse iMovies

Learn how to use iMovie 6 to create time-lapse movies. more
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Click to view dak's profile New Member 115 posts since
Jul 20, 2004
1. Jul 28, 2006 3:16 PM in response to: Macworld.com
Darn math...
The simple concept -- I want x minutes to be compressed into y minutes (or x seconds into y seconds, or whatever as long as both units are the same), is easy but not obvious. Divide x by y (x/y -- 720/2 in this example) and you get the number of frames that you should put into that iMovie dialog box. Thanks for publishing this simple and very cool tip.

However, one paragraph in the article doesn't make sense... some terms, numbers and math got messed up here and there:

Quote:<hr />
All you need to do to start capturing a time-lapse movie is to fill in the number of frames that should be allowed to pass before you capture one image. Since the DV frame rate is 29.97 (or roughly 30) frames per second, if you set the pop-up to 30, youll be capturing one frame for every 30 seconds of real time. If you let the camera run for 30 minutes, youd wind up with 60 frames (two frames from each minute). When you play that movie back, it will take roughly two seconds, since the playback will happen at the standard 29.97 frames per second. Bingo, instant time compression.

<hr />

First of all, except for engineers or time-code readers, no one needs to care about the 29.97 thing. Let's just say, for now and forever, that NTSC video is 30 frames per second. (PAL, by the way, is 25). Now then, that paragraph should read:

All you need to do to start capturing a time-lapse movie is to fill in the number of frames that should be allowed to pass before you capture one image. Since the DV frame rate 30 frames per second, if you set the pop-up to 30, youll be capturing one frame for every <!--color-->second<!--color--> of real time. If you let the camera run for 30 minutes, youd wind up with <!--color-->1800<!--color--> frames (<!--color-->sixty<!--color--> frames from each minute). When you play that movie back, it will take roughly <!--color-->thirty<!--color--> seconds, since the playback will happen at the standard 30 frames per second. Bingo, instant time compression.<!--color-->

:d
Click to view imjeffp's profile New Member 27 posts since
Jul 7, 2004
2. Jul 28, 2006 3:38 PM in response to: Macworld.com
Re: Mac OS X Hints Weblog: Create time-lapse iMovies
I used a 1 in 60 setting for most of this movie shot with an iSight.
Click to view griffman's profile Macworld Editorial 8,041 posts since
Jan 9, 2001
3. Jul 28, 2006 4:47 PM in response to: dak
Re: Darn math...
You are correct -- that paragraph is seriously wrong . That's what I get for changing my example at the last minute. I've edited the paragraph now with your corrected text, thanks!

-rob.
Click to view 153957's profile New Member 31 posts since
Jul 13, 2006
4. Jul 28, 2006 5:43 PM in response to: griffman
Re: Darn math...
I just use still cameras, that way you're not stuck with all those other frames which you wont be needing, and the quality is higher.

here are my attempts at Time-Lapse:
http://www.delaat.net/~arne/New/timelapse.html
Click to view griffman's profile Macworld Editorial 8,041 posts since
Jan 9, 2001
5. Jul 28, 2006 5:54 PM in response to: 153957
Re: Darn math...
iMovie doesn't capture the frames you don't need; it just captures them at the interval you specify. But yes, using a high-quality still camera and something like evoCam, you can make some very nice time-lapse clips.

Before iMovie 6 came out, we had a large yard project done, and I did just that -- stuck the camera upstairs in the window, and snapped a pic every 15 seconds, all day, for weeks at a time. The end result was quite cool

-rob.
Click to view cindys's profile New Member 9 posts since
Aug 30, 2005
6. Jul 28, 2006 6:13 PM in response to: Macworld.com
Re: Mac OS X Hints Weblog: Create time-lapse iMovies
In iMovie 5, stringing still photos together to create a stop motion effect could only be done at a resolution of 10fps. because the smallest value allowable for the length of showing any individual photo was, on the iMovie timeline, 0:03 (where 1minute=0:30). Has this resolution been improved with iMovie 6?
Click to view griffman's profile Macworld Editorial 8,041 posts since
Jan 9, 2001
7. Jul 28, 2006 6:19 PM
Re: Mac OS X Hints Weblog: Create time-lapse iMovi
I was just able to add a still with a 0:00:01 duration, so it looks like it has.

-rob.
Click to view 153957's profile New Member 31 posts since
Jul 13, 2006
8. Jul 28, 2006 6:41 PM in response to: griffman
Re: Darn math...
Quote:<hr />
iMovie doesn't capture the frames you don't need; it just captures them at the interval you specify. But yes, using a high-quality still camera and something like evoCam, you can make some very nice time-lapse clips.

<hr />


ah yes, I miss read.. (I was under the impression that you'd first make a movie, transfer it to your mac, and then get the frames at the interval out of the movie..)

and I dont think Evocam works (well) with still camera's... (I use Bear's Hand), but I might be mistaken
Click to view griffman's profile Macworld Editorial 8,041 posts since
Jan 9, 2001
9. Jul 28, 2006 7:57 PM in response to: 153957
Re: Darn math...
Sorry, that was my bad sentence construction -- should have said "... or evoCam," as evoCam has more still-frame capturing options (full control over the text overlay, for example).

-rob.
Click to view kostia's profile New Member 9 posts since
Apr 20, 2005
10. Jul 28, 2006 9:56 PM in response to: Macworld.com
Re: Mac OS X Hints Weblog: Create time-lapse iMovi
I used the slowest setting it let me use (1:600) and left it running all night to capture the sun rising outside the window. It isn't great, but I think it's cool.

http://www.kostia.net/pics/timelapse.mov
Click to view Kyan's profile Member 259 posts since
Jan 12, 2003
11. Jul 29, 2006 4:23 AM in response to: kostia
Re: Mac OS X Hints Weblog: Create time-lapse iMovi
What about the opposite? I've not used iMovie for this yet, but can movements which are fast real time be slowed down just easily? For example, a tennis serve to slow-mo?
Click to view Nobody's profile New Member 58,347 posts since
Oct 18, 2007
12. Jul 29, 2006 8:15 PM in response to: Kyan
Re: Mac OS X Hints Weblog: Create time-lapse iMovi
You need a camera that is capable of recording greater number of frames/sec than the normal cameras (30/sec).
Click to view griffman's profile Macworld Editorial 8,041 posts since
Jan 9, 2001
13. Jul 29, 2006 10:52 PM in response to: Kyan
Re: Mac OS X Hints Weblog: Create time-lapse iMovi
iMovie has a slow down effect, and with a bit of trickery, you can slow a clip down multiple times. However, if you only started with a 30fps camera, you won't be able to "see" any more in slow-mo -- a ball moving faster than 100mph, for instance, will still be a blur in slow mo mode. But the video will move more slowly.

-rob.
Click to view moparsteve's profile New Member 2 posts since
Jul 30, 2006
14. Jul 30, 2006 1:01 AM in response to: Macworld.com
Re: Mac OS X Hints Weblog: Create time-lapse iMovies
How do you get the time and date stamp in imovie? I have the time/date stamp on all the time on my video dv camcorder, and I can see it when I playback on a tv, but I can't get it to show when I import to imovie.