Re: [Motion-user] Lumenera problem on v3.2.3 (now duplicate images)

[Kenneth L. <ke...@la...>]

At 11:49 2005-08-25, you wrote:
>About JPEG Netcams:
>
>What if a Netcam gives me a jpeg, but this is just the same image as the 
>last one?
>
>Imagine we get those jpeg's stored on a public webserver, where the netcam
>stores the pictures.
>
>maybe motion should look at images and compare?
>
>cu Peter

This would mean that Motion would have to download the entire picture 
anyway and compare it with the previous image.

I think in principle it is not very likely that a "real" new picture in 
jpeg format of the exact same motive and the exact same light would be the 
exact same jpeg file. There is always a bit of noise in the camera. But 
with a very low quality setting this could be the case.

I want to make sure that Motion does indeed deliver a picture to the webcam 
or mpeg if one is fetched.

If a person passes by a camera and then another person 3 seconds later - 
and we have a post_capture setting equivalent to 10 seconds - I want to see 
the 3 second quiet period even if the picture from the camera is so calm 
that it produced the exact same jpeg.

If you get the same jpeg image from your netcam then it is because you 
sample it too fast. And if your netcam cannot do at least 2 frames per 
second Motion will fill in duplicate images to ensure that the webcam 
stream to for example cambozola, Firefox, Palantir etc is maintained and 
people see the time stamp increasing showing that the connection is alive 
and working.

Motion cannot repair a bad network connection or a too busy netcam. That 
needs to be addressed in itself.

Kenneth


-- 
Kenneth Lavrsen,
Glostrup, Denmark
ke...@la...
Home Page - http://www.lavrsen.dk