what is causing choppiness of video in compact cameras?

Started Sep 22, 2013 | Questions
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PeetieT New Member • Posts: 5
what is causing choppiness of video in compact cameras?

I have seen many compact cameras and cell phones creating a video, that is jumping up and down. Like the plane taking off video in Nikon AW110 review. What is causing it? Is is the lack of encoding resources?

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thebustos Senior Member • Posts: 2,809
Re: what is causing choppiness of video in compact cameras?

Without seeing am example, my best guess is the video is interlaced rather than progressive, lower bit rate, or both maybe...
--
Good luck and happy shooting!

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PeetieT OP New Member • Posts: 5
Re: what is causing choppiness of video in compact cameras?

thebustos wrote:

Without seeing am example, my best guess is the video is interlaced rather than progressive, lower bit rate, or both maybe...
--
Good luck and happy shooting!

Checkout Sample Video 1 on the below link. It is progressive video, 16 Mbps is not too low and anyway if the bitrate would be low, than the picture quality should suffer, not the smoothness of the recording.

http://www.dpreview.com/reviews/nikon-coolpix-aw110/3

brianj Forum Pro • Posts: 14,657
Re: what is causing choppiness of video in compact cameras?

PeetieT wrote:

thebustos wrote:

Without seeing am example, my best guess is the video is interlaced rather than progressive, lower bit rate, or both maybe...
--
Good luck and happy shooting!

Checkout Sample Video 1 on the below link. It is progressive video, 16 Mbps is not too low and anyway if the bitrate would be low, than the picture quality should suffer, not the smoothness of the recording.

http://www.dpreview.com/reviews/nikon-coolpix-aw110/3

The one of the seaplane looks completely steady and normal on my PC.

Brian

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Draek
Draek Senior Member • Posts: 2,028
Re: what is causing choppiness of video in compact cameras?

Fast shutter speed, most likely -- most people who aren't videographers don't bother screwing ND filters in front of the lens to follow the 180 degree rule in daylight, and even in cameras with 60fps recording (most do only 30), with a 1/500 shutter speed there's a lot of information that's not making it to the camera sensor.

Personally it doesn't bother me much, but some people are particularly sensitive for it and that's why the 180 degree shutter rule was first devised -- use half the reciprocal of the framerate (ie, 1/60 for 30fps) as your shutter speed, adjust brightness with ISO, aperture and ND filters as necessary.

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PeetieT OP New Member • Posts: 5
Re: what is causing choppiness of video in compact cameras?

brianj wrote:

PeetieT wrote:

thebustos wrote:

Without seeing am example, my best guess is the video is interlaced rather than progressive, lower bit rate, or both maybe...
--
Good luck and happy shooting!

Checkout Sample Video 1 on the below link. It is progressive video, 16 Mbps is not too low and anyway if the bitrate would be low, than the picture quality should suffer, not the smoothness of the recording.

http://www.dpreview.com/reviews/nikon-coolpix-aw110/3

The one of the seaplane looks completely steady and normal on my PC.

Brian

Even the author mentioned it.

I think it is something like this:

http://en.wikipedia.org/wiki/Rolling_shutter

Cheers,

Peter

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