AI Script Breakdown

What a breakdown is for

Before anyone shoots anything, somebody reads the script and writes down what it will take: who is in it, where it happens, what has to be on the table, and how it divides into shootable units. That document is a breakdown, and on a conventional production it is what the schedule and the budget are built from.

Generated video needs the same document for a different reason. Every shot is rendered independently, so anything that has to stay the same across shots has to exist as a shared object first — one that later shots point at instead of re-describing. The breakdown is where those objects are created.

What one pass produces

Long scripts are read in two passes, on purpose

A single model call has an output budget. When a script exceeds it, the model does not raise an error — it simply stops early and returns fewer episodes than the material contains. In our own offline evaluation a fifty-episode script came back as ten, with nothing in the response to indicate the other forty were dropped. That is the worst kind of failure: a plausible, complete-looking document that is quietly wrong.

So past roughly 10,000 equivalent characters the breakdown runs as two calls — one returns the cast, locations and props; the second returns the episode skeleton with its anchors. Each episode's full outline is then expanded when you open that episode, so a sixty-episode upload does not pay for sixty expansions you may never read. The ceiling for the two-pass path is about 300,000 characters of English, roughly 50,000 words.

Read it before you spend anything

The breakdown is the cheapest thing in the pipeline and the most expensive thing to get wrong, because everything downstream points at it. A face described vaguely produces a generic reference sheet, and that sheet is then attached to forty shots. Fifteen minutes spent here is worth more than any amount of regenerating later.

1. Check the episode count against the script. Each entry quotes its source line — if the last quoted line is halfway through your file, the breakdown is short.
2. Fix character descriptions now, while they are still text. Add the anchor a stranger would use to pick that person out of a crowd.
3. Delete props that are set dressing. Anything left in the prop list gets reference art and gets attached to shots.
4. Check who is missing. A character who speaks once and is never touched or named again may not have made the cast list; add them if a later shot needs their face.

What it will not do

• Schedule or budget a live shoot. There are no day-out-of-days, call sheets or crew counts here. This is a breakdown for generated video.
• Invent plot. Scene order, dialogue and beats follow the script. What the pass adds is structure and specificity, not story.
• Read a PDF or .fdx directly. Plain text, .docx and .md, or paste. Screenplay layout is understood; export first.
• Guarantee every prop. The pass is good at objects the plot handles and unreliable at objects mentioned once in passing. Check the list.

What it costs

Analysis is charged once for the whole upload, by length: 4 credits per 3,333 characters of English text. A 30,000-character script is therefore about 36 credits — the cheapest stage by an order of magnitude, and the one everything else depends on. Reference art is billed separately per image, with 15 free per account and 7 credits each after that; shot lists are 1 credit per 333 characters per episode. Timing: reading a whole script takes about 2 minutes 49 seconds at the median, measured across every analysis that completed successfully on scenemixer.com in the thirty days to 20 September 2026. Full table on the pricing page.

Frequently asked questions

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