Scale Batch Prompt Schedule

Niche node, clear job. If you build animations with prompt scheduling - the "at frame 0 do this, at frame 24 do that" travel format from Fizzledorf's FizzNodes BatchPromptSchedule - and you've ever wanted to change the length of a clip without hand-retyping every keyframe number, this is the node that does the arithmetic for you.

What problem it solves

Prompt scheduling in AnimateDiff-style workflows uses a little text format where you pin values to specific frames:

0:(0.0),
7:(1.0),
15:(0.0)

That says "at frame 0 the value is 0, ramp to 1 by frame 7, back to 0 by frame 15." Great - until you decide the animation should be 64 frames instead of 16. Now every one of those frame indices is wrong, and if you've got a dozen keyframes across several scheduled parameters, rescaling them by hand is exactly the kind of fiddly error-prone busywork that produces off-by-a-few-frames bugs. This node takes the schedule string and remaps all the frame numbers proportionally from an old length to a new one, so the shape of your animation stays identical while the timeline stretches or squashes to fit.

It's a text transformer. Nothing about images or latents touches it - it eats a string and emits a string.

The inputs and output

All three inputs are the whole story:

• input_str - your schedule text in the FizzNodes format, the thing you'd normally paste straight into a BatchPromptSchedule node.
• old_frame_count - the length the schedule was written for.
• new_frame_count - the length you want it retimed to.

The single output is a STRING: the same schedule with every frame index scaled from old to new. You feed that string into your actual prompt-schedule node downstream. So the pattern is: write the schedule once at a convenient length, then park this node in front of your scheduler and change only new_frame_count when you want a different duration.

How to install it

It comes with kijai's KJNodes pack.

• ComfyUI Manager - search KJNodes for ComfyUI, install, restart.
• Manual - cd ComfyUI/custom_nodes && git clone https://github.com/kijai/ComfyUI-KJNodes, then pip install -r ComfyUI-KJNodes/requirements.txt, restart.

No models or extra dependencies. Note that the node that consumes the output - BatchPromptSchedule - lives in a different pack (FizzNodes), so you'll want that installed too for the schedule to actually do anything.

Common issues & troubleshooting

Keyframes land on fractional frames. Scaling 15 to a 64-frame timeline won't always produce whole numbers, and downstream nodes want integer frame indices. If a rescaled schedule behaves oddly, check whether the new counts came out clean; sometimes nudging new_frame_count to a value that divides more evenly avoids ugly rounding.

The output does nothing on its own. This node only rewrites text. If you wired it to something that isn't a prompt-schedule consumer, nothing happens - it's a preprocessor for BatchPromptSchedule, not a scheduler itself.

It's an AnimateDiff-era tool. Prompt-travel scheduling belongs to the AnimateDiff/SD1.5 animation era. If you've moved to Wan or LTX for video, that whole pipeline is different and this node isn't part of it - it's here for the batch-schedule workflows that still run, not for modern diffusion-transformer video.