Try setting your cameras white balance to a manual setting. If night shooting set it to fluorescent light. If day, set to sun, cloud or shade. I do a lot of panoramas and mosaics. If I dont manually set the white balance, the camera sets a very slightly different one for each shot, therefore when played in a movie, it will flicker. I have done with with time lapse, and it came out just fine. Mine went from day to night with clouds shooting over a mountain, and then showed the movement of the stars. I started with 5 secs delay with the camera on AV mode, so it set the shutter speed, and as it got darker the shutter went down to 30 secs, therefore I took a lot of pics over about 5 hours...sad I know but it looks good and I had just got the 10d!!!