How to Change a Segment’s Duration, and Which Tiers Accept 30 Seconds

Quick answer: A segment is one generation, and its length is the sum of its shots’ seconds. Change a shot’s seconds in its header line (or through the @ menu) and the total follows. Two limits apply. The episode’s segment length — Standard 15s or Long take 30s, chosen in Step 3 when you generate its storyboard — caps what the editor lets you set. The video tier caps what it will generate: the Wan 3.0 and Seedance 2.5 tiers accept up to 30 seconds, the Seedance 2.0 and MiniMax H3 tiers up to 15. You pay per second generated, so a 30-second segment costs twice a 15-second one on the same tier.

Still from “The Eagle's Vow”, an AI short drama generated end-to-end by SceneMixer (9 characters, 1 episode) — Sample: “The Eagle's Vow” — Realistic HD, 1 episode, produced end-to-end by SceneMixer from the script · watch the episodes

Open a segment, change one shot from 4 seconds to 6, and watch the segment total and the price tag update before you generate.

Where the seconds live

Each shot line starts with its number and its seconds. Edit the number, save, and the segment’s total and its price tag on the timeline card change immediately; nothing is generated until you press the button. The @ menu offers the same edit with a preset list. The segment total stays between 4 seconds and the episode’s segment length; the editor shows the total in red when the shots add up to more. It does not check whether a line fits its seconds, so give a spoken shot the time it takes to say. Details of the timing rules: Shot Seconds and Timing.

A storyboard segment: location, time and weather fields, then numbered shots with durations, asset chips and spoken lines — The segment's total is the sum of its shots; each shot's seconds sit in its header line.

The tier’s cap

One segment is one request to the video model, and each model accepts a maximum length per request: Wan 3.0 (480P, 720P, 1080P) and Seedance 2.5 (480P, Lite, Pro) take up to 30 seconds; Seedance 2.0 (480P, Fast, standard) and MiniMax H3 (H3, H3 Fast) take up to 15. Switch tiers in the model selector in the editor’s top bar and the cap switches with it. A segment longer than the tier’s cap is refused when you press generate, with a message naming the cap; it is not cut, and nothing is charged.

The episode’s segment length

Each episode’s storyboard is written to a segment length you pick in Step 3 before generating it: Standard 15s (the default) or Long take 30s. It shapes how shots are grouped into segments, and it is also the ceiling for editing: in a 15-second episode a segment stops at 15 seconds whatever you type. To get 30-second segments, generate the episode’s storyboard in Long take 30s and generate them on a Wan 3.0 or Seedance 2.5 tier. What the two modes change in practice: 15-Second or 30-Second Segments.

Making a segment longer without making it worse

Longer is not automatically better: one 30-second generation has to hold the same faces and the same room for twice as long, and a mistake in second 25 costs the whole take. Add seconds to shots that need them (a spoken line, a slow reveal), not to every shot; if you want more story, add a segment rather than stretching one — Insert or Delete a Segment. Leave a couple of seconds under the cap on the 30-second tiers.

What it costs

Price is per second of the tier: the default tier is 10 credits a second, so a 12-second segment and a 24-second segment differ exactly by that ratio. The timeline card shows the price before you generate; regenerating a longer version is a new charge. Where your credits go in one episode.

Tier family	Max seconds per segment	Typical use
Wan 3.0 · 480P / 720P / 1080P	30	Default; drafts to finals
Seedance 2.5 · 480P / Lite / Pro	30	Longer single takes
Seedance 2.0 · 480P / Fast / standard	15	Short punchy shots
MiniMax H3 / H3 Fast	15	Short takes, no 480P

FAQ

Can I make a segment 30 seconds?

Yes, if the episode's storyboard was generated in Long take 30s mode in Step 3 and you generate on a Wan 3.0 or Seedance 2.5 tier. In a 15-second episode segments stop at 15.

Why does my segment total not match what I typed?

The total is the sum of the shots, kept between 4 seconds and the episode's segment length. Check every shot line.

Does a longer segment cost more?

Yes, per second, on every tier. The card shows the price before you generate.

Can I generate 4 seconds?

Yes; 4 seconds is the shortest segment. Make sure a spoken shot still has time for its line.

Will the site cut my segment to fit?

No. A segment past the tier's cap is refused when you press generate, before anything is charged; shorten it or pick a 30-second tier.

Set the seconds, then pick the tier

Seconds are yours to edit; the cap and the price come from the tier you generate with.

Open the editor

Updated September 27, 2026