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Old Aug 4, 2009, 12:21 AM   #1
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On P&S cameras that have video, why is 15fps SVGA video better than 30fps VGA(640x480)? Isnt 30 twice of 15?Thus, at 15fps wouldnt the video look like a Charlie Chaplin film, sped up as 1/2 frames are missing? And why not use the standard 24fps used in movies?Computer Shopper Apr'06 p.130
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Old Aug 4, 2009, 5:01 AM   #2
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Originally Posted by romphotog View Post
On P&S cameras that have video, why is 15fps SVGA video better than 30fps VGA(640x480)? Isnt 30 twice of 15?Thus, at 15fps wouldnt the video look like a Charlie Chaplin film, sped up as 1/2 frames are missing? And why not use the standard 24fps used in movies?Computer Shopper Apr'06 p.130
The gain is the higher resolution of 800x600. As for playing faster that is not the case as the key is fps (frames per second) so you have the set time code so it just isn't as smooth as 30 fps. Most cameras are offering 30fps rather than 24fps. This is a big conversation that goes on in things like Canon 5D mkII forum as a lot of shooters would like this. However as most of us only put our vids on the web then 30 is fine. 15 is also not that bad.
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Old Aug 4, 2009, 4:56 PM   #3
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This is roughly the same as my answer to your identical question on DPReview. Most of the current generation P&S cameras offering better the VGA video are not offering SVGA (800x600) but rather some flavor of HDTV (either 1280x720 or 1920x1080) at a reduced framing rate. I believe the reason for the reduced framing rate is that those camera do not have enough processing power to handle the increased data of higher resolutions. As Mark points out at least the mfrs. are allowing the user to make the trade off between higher resolution and smoother motion.

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Old Aug 9, 2009, 11:51 AM   #4
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...Thus, at 15fps wouldnt the video look like a Charlie Chaplin film, sped up as 1/2 frames are missing?...
No, unless the player software makes the same mistake that was common in the incorrectly projected silent films (your "Charlie Chaplin film" reference) you've seen.

If the playback is at the same fps as that used by the camera it will play at a normal speed. The sped-up effect you remember came from the old silent films being shot at 12-16fps (12fps was Edison's early "standard" and 16fps was the industry standard at the peak of the silent era) being projected as the modern sound standard of 24fps. This often happened because the proper equipment wasn't available.

When properly projected, the old silents show no speed or timing flaws. Its only when there is fast action that you seem some less than smooth rendering. The same goes for 15fps video. If you look at old (old = anything pre-computer) film animation made with sound, you'll see excellent results. These were shot to be projected at 24fps but evey cell was shot twice. This gives the image effect of only 12fps while allowing projection in standard 24fps projection systems.
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