Timelapse of sunset over the Toronto skyline. HDR source images loaded into Sony Vegas @ 24 fps. Bracketed source images merged and tonemapped in Photomatix Pro.
There is some flicker in here but I'm not overly concerned about it. I've decided that as a result of the compression of time, flicker due to changing light (cloud movement, sun movement, etc), what would be seen as a gradual change in light is sped up, like everything else, and appears as flicker. I'm becoming less convinced that it has to do with using Av rather than full manual at the time of shooting.
There were two instances where I had to stop the camera and increase the ISO to keep my brackets within the 12 second spacing I had set. I used those opportunities to add cuts via a faded zoom to make them less obvious.
Bracketing was 5 frames every 12 seconds 1 stop apart. Camera was a Nikon D700 in Av shooting Small Fine JPEG. Lens was a Nikon 28-70 f2.8 @ f8 & 34, 45 & 32mm. Cropped the tonemapped images to 1920x1080, did final post-tonemap edits in Lightroom then exported as sequence for importing into Vegas. Imported into Vegas as 3 separate clips and crossfades added. Exported as AVI @ 24fps using Lagarith Lossless Codec.