Dealing with dropped frames in background plate when doing keyframe animation in After Effects I am working on a video which includes some dropped frames ever so often. When a frame dropped, it repeated the previous frame sometimes 2 or 3 times. I am overlaying many objects on this video, and the problem is that when interpolating a property, it continues to interpolate during the dropped frames, meaning the objects move while the video remains still. Because of the huge amount of objects in my scene (100+) it is incredibly tedious to go through each and find each dropped frame, set a keyframe for the properties, and copy them for all the repetitions of that frame. Is there a way to either set a keyframe for all properties at some time, or ideally to set time ranges for the whole composition where interpolation is disabled?
Try frame blending.


Show the switch column in timeline.
Check, and enable the Frame Blending switch on the timeline.
Check, and enable the Frame Blending option of the layer.
Always check your composition frame rate.


Shortcut:
ctrl + k (Win) or command + k (Mac)