Create Videos Using AI: Who Decides What, in 20 Decisions

Quick answer: Creating a video with AI is twenty small decisions, and the useful question is who makes each one. In SceneMixer the AI decides eight and lets you override them; it proposes six and waits for you to confirm; and six are yours alone. The six that are yours include the ones that cannot be changed later, so they are worth the most thought. Every step that costs credits starts with a button you press, with its price on it. This guide lists all twenty, says where each happens and how to override it, and ends with the order to check them in.
Still from “Rust City Knockout”, an AI short drama generated end-to-end by SceneMixer (6 characters, 1 episode)
Sample: “Rust City Knockout” — Painterly Anime, 1 episode, produced end-to-end by SceneMixer from the script · watch the episodes

How to read the ledger

Three kinds of decision, in the order a project meets them. The AI decides: it makes a choice from your script and you can change it. The AI proposes: it fills something in or drafts it, and you confirm. Only you: nothing is filled in for you, or the choice is yours by nature. Other guides sort the same project differently: Create videos with AI by what you have, and Video AI by which models do which job. This one sorts it by who holds the decision.

The AI decides, and you can override (8)

#DecisionWhat the AI doesHow you override it
1Where the episodes breakThe reading cuts your script into episodes by story: more script gives more episodes, not longer onesCut the script yourself before the read. Afterwards the split is fixed; a different split is a new project
2Who is in the castAnyone who acts, speaks or is handed something becomes a character with a role: Lead, Supporting or Villain. A part heard and never seen is marked Off-screenAdd, delete or relabel in step 2. Adding a character the script did not produce needs a paid plan
3What each person looks likeWrites an appearance and clothing for every characterEdit the text and regenerate the sheet
4Which places and props get picturesLists the places and the objects that matter to a shotAdd or delete entries in step 2
5The shot listWrites each episode as segments of shots, with a size, an angle, the line and the secondsEdit the text (free), change shot seconds, insert or delete a segment
6How each person soundsWrites a voice description per character; by default the video model performs itAsk for a free voice match and attach a preset you can hear, or upload a voice
7The musicPlans a score for the episode once its first shot exists, picks or writes the pieces and mixes them under the voicesOnly the Music switch beside the player. There is no track picker or volume control
8Joining the segmentsJoins the finished segments into one episode fileYou press Composite once every segment has a clip

The AI proposes, and you confirm (6)

#DecisionWhat the AI proposesWhere you confirm it
9The three looksPre-fills the visual, scene and costume styles that you have not touched, tagged as AI’s choiceStep 1. All three must be set before the read starts
10The script, if you have only an ideaAI Create writes a draft from your lineYou read and edit it in a window before it is read
11The summaryAfter the read, step 1 shows the title, protagonist, era, strategy and the counts of characters, places, props and episodesYou check the cast and the episode count
12The cast picturesDraws a sheet for each character, place and propAccept, regenerate, AI edit or upload your own. You can continue without making all of them
13The next episodesLet AI continue drafts one to three episodes from where the story stands. AI story continuerYou read and edit the draft, then add it
14The coverPre-selects a genre mood and your leads, and paints three poster optionsYou choose one

Only you (6)

#DecisionWhy it is yoursWhere
15What the story isAn idea, or a script, and how many people and places. Fewer, steadier characters hold up betterThe first tab you use
16Type: Short Drama, TV Series or FilmIt sets how the script is cut, the length cap of an episode (240 s, 300 s, none) and the acting grammarStep 1. Fixed when the script is read
17The shape: 16:9 or 9:16The shape of every shotStep 1
18Dialogue language and the Target RegionThe language the cast speaks, and where the names, faces and places are setStep 1. Fixed when the script is read
19Quality and spend, segment by segmentEach segment is priced by seconds and tier. The cheapest tier starts at 10 credits a secondThe model button on every segment card
20Which takes to keepYou watch each clip, regenerate a failed one, or fix it with Edit this clip: trim, change the visuals, redubThe episode editor. Each segment keeps a version history

Decisions 16 and 18 are the two that cannot be taken back once the script is read, so make them on purpose. Changing the region, dialogue language or type after the script is read says what to do if you chose wrong.

The ones that lock early

DecisionFixed whenTo change it
Type (16)The script is readA new project with the same script
Dialogue language and Target Region (18)The script is readEdit descriptions and lines, or a new project
Visual styleYou continue past step 1A new project
Scene style and costume styleThe script is read; they are written into the descriptionsEdit the descriptions in step 2 and regenerate the sheets
Cast, props, shot text, tier, takesNeverAny time

That is why the first four rows get your attention first and the last row can wait. Why scene and costume style are chosen before the read explains the third and fourth.

The order to check them in

The cheapest place to find a wrong decision is before the expensive step. Four checkpoints cost little or nothing:

  1. The summary (11). Is it the right protagonist, era and number of episodes? The read is priced by length, 4 credits per thousand characters on the default.
  2. The cast pictures (12). Do the faces look like the people you meant? The first 15 setup images on an account are free.
  3. The storyboard text (5). Read the shots and fix the lines. Editing the text is free, and episode 1 of the first drama has a free storyboard.
  4. The preview. One shot of about 5 seconds with your own cast, on the cheapest tier, once per account. A new account also starts with 50 credits.

Only after those does video start, at the price on each card. The longer checklist is Checklist before you generate videos, and Where credits go in one episode adds up a whole episode.

FAQ

How do I create videos using AI?

Start with a script, an idea, product photos or a clip. The AI reads it into a cast, places and shots, you check the cast and the text, and the video is made segment by segment and joined.

What does the AI decide for me?

The episode breaks, the cast list and roles, how people look, the places and props, the shot list, the voice descriptions, the music and the joining. You can change most of them.

What can only I decide?

The story, the Type, the shape, the dialogue language and region, the quality and spend per segment, and which takes to keep.

Which decisions cannot be changed later?

Type, dialogue language and region are fixed when the script is read. The visual style is fixed once you continue past step 1.

Can I change the music?

There is no track picker or volume control. A Music switch beside the player turns the score off in playback.

Do I have to approve the AI’s choices?

For the looks, the script draft, the summary, the pictures, the next episodes and the cover, yes: they are proposals. Nothing that costs credits starts without you pressing a button.

Can I check anything before paying for video?

Yes: the summary, the cast pictures, the storyboard text and a short preview, all free or covered by the free allowances.

How long does one video take to make?

The reading takes minutes and each segment runs on the server while you do other things. Closing the page does not stop a generation.

Make the four early decisions, then check them in order

Type, language, region and look are fixed when the script is read, so they are the ones to settle first.

Start a video

Updated November 2, 2026