Deforum keyframe schedules interpolate parameter values linearly between defined frame:value pairs

Every Deforum parameter whose name ends in _schedule can be keyframed with the same syntax: a comma-separated list of frame:(value) pairs. Between defined keyframes, values do not hold; they move linearly toward the next defined value, frame by frame. Example: 0:(0), 10:(10) yields 0, 1, 2, … 10 across frames 0-10. Parameters without schedule support stay fixed throughout the animation. Schedules and prompts can additionally use mathematical expressions for dynamic values. This syntax is prerequisite to all Deforum animation work — every motion, noise, strength, and CFG schedule uses it.

Examples

strength_schedule: 0:(0.7), 50:(0.5), 100:(0.65) — lowers diffusion strength to frame 50 then rises again. zoom: 0:(1.0), 100:(1.05) — a slow zoom over 100 frames. Value at an in-between frame is the linear interpolation of its bracketing keyframes.

Assessment

Write a Deforum keyframe schedule for a zoom parameter that starts at 1.0, peaks at 1.05 at frame 30, then returns to 1.0 at frame 60. What will the value be at frame 15?