I've created a composition about a minute long showing a timelapse style sunrise over some rolling hills. As part of this I've keyframed changes in hue/saturation, brightness/contrast and some other parameters in Shine and Knoll Light Factory.
My client needs me to extend the sequence so it happens over 45 minutes. I've tried dragging out the keyframes over this duration but because the values now change so slowly, there seems to be occasional 'jumps' in some of the values which are quite noticeable, particularly at the beginning of the sequence.
For most of the properties there are only two keyframes.
What's the best way to ensure a smooth transition between these keyframes over such a long time period that is imperceptible to someone watching?
I would try precomposing the animation you have now, extending the main comp to 45 minutes and enabling time remapping on the precomp layer. You then drag out the last keyframe (and the clip) to the end of the main comp. This should create the smooth animation/transitions you are looking for.