Guide
How to generate 20-second AI videos automatically
By the Mubuz team · Published
A lot of people search for a "20-second AI video generator" because 20 seconds feels like the sweet spot for Shorts and Reels. To be clear from the start: Mubuz makes 15-second episodes, not 20-second ones. Here is how short AI videos are made automatically, why we chose 15 seconds, and what to do if you need longer.
How a short AI video is made automatically
- A text model writes a script that fits the length: about 2 to 3 words per second of narration.
- An image or video model draws the scenes.
- A voice model reads the script; captions are timed to the voice word by word.
- Music goes under the voice, and the parts are joined into one vertical video.
Why Mubuz episodes are 15 seconds
- A 15-second episode can be watched twice in the time a longer one is watched once, and a story that ends on a question pulls viewers to the next episode.
- Each episode tells one event. Longer stories become more episodes, not longer ones, so every upload is a new video rather than a stretched one.
If you need 20 seconds or more
YouTube Shorts can be up to 3 minutes. You can download several Mubuz episodes of one series and join them in any editor into one longer video, or post them as a numbered series, which is how most story channels grow.
Questions
Does Mubuz make 20-second videos?
No. Every Mubuz episode is 15 seconds. You can join several episodes into a longer video yourself.
How long can a YouTube Short be?
Up to 3 minutes.
Sources
- YouTube Help: get started creating YouTube Shorts (checked 27 October 2026)