Whenever I add any time-modifying parameter (Time Remapping) or effect (Timewarp) in a composition, as soon as I apply either time-related effect, it ignores my in-points on my video clips and starts the effect from the start of the clip. This only happens when it's a time related parameter or effect.
I posted a similar problem recently, and although I realized that the reason my in-point was being ignored was because I added a time-related parameter or effect, I now don't know WHY it ignores my in-points on my video clip when a time-related parameter or effect is added to a clip.
All I'm trying to do is start a zoom in about 10 seconds later in a clip, and I then want the zoom to happen more slowly. I know I can trim the video clip to the desired start point before importing it into After Effects, but I'm still assuming that I'm just missing something obvious.
Time Remapping should work fine. Are you setting/adjusting keyframes?
I eventually realized that a keyframe was being added at the very start of the clip and not my chosen in-point whenever I added keyframes. I have to scroll before zero and remove that keyframe at the very top of the clip...problem solved.