Motion - Support Question 2005x 03x 22x 053049

Motion detects movement on lines.


Dear Kenneth.

Sorry for bypassing the request procedure, seems complicated..

What is complicated about filling out a web form? It takes me a significant time to answer support questions and I will rather answer them where hundreds of people can read the answer than in a private email.

My question is easy:

Motion working fine with 3 cameras, but I have problems with the exterior ones.

Motion detects movement on lines. Can be a straight metal structures, or a wall that is straight.




Pictures attached


Motion version: Not given
ffmpeg version: Not given
Libraries: Not given
Server OS: Not Given

-- KennethLavrsen - 22 Mar 2005 for Cris Lobin


You have interlacing on your camera. It is very clear to see that every 2nd line is offset a little bit. Maybe you camera is moving in the wind. Or maybe it is just not syncing each line very well. Can be noise that does that.

It is never a good idea to use interlaced video signal for single image capturing. Any moving objects will look awful. I am not sure I know all ways to avoid it. Here are a few things to try.

  • PAL cameras run at 25 fps (50 fps interlaced). NTSC cameras runs at 30 fps (60 fps interlaced). Run a low framerate that the capture card does not have to pick up interlaced video.
  • Reduce the resolution typically to 320x240 should eliminate interlacing.

-- KennethLavrsen - 22 Mar 2005
Topic revision: r1 - 22 Mar 2005, KennethLavrsen
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