Editing video in the timeline editor
The timeline editor is where generated clips become a finished video. It's a multi-track editor: you cut clips, arrange them, and export. When a clip has audio, that audio is split automatically onto its own linked lane, so you can work with picture and sound separately. You can also extend a clip from a trailing reference clip to grow a shot. Clips reach the timeline from Video Studio, and from here you export the final file. This is assembly and trimming — the generation itself happens in Video Studio.
How do I cut and arrange clips?
Lay your clips on the timeline tracks and trim them to the parts you want. Because the editor is multi-track, you can stack and sequence clips rather than working with a single strip. Cut a clip to remove the section you don't need, then position the pieces in the order you want the final video to play.
What is the linked audio lane?
When a clip carries audio, that audio is automatically moved onto its own lane, linked to the clip it came from. This separation lets you handle the sound independently of the picture while keeping the two tied together. It means you don't have to manually detach audio before working with it — the split happens for you.
How does extend-video work?
Extend-video grows a shot by continuing from a trailing reference clip. You take the tail of an existing clip as the reference, and the editor extends from there, so the new footage carries on from where the clip left off rather than starting fresh. This is the way to make a shot longer when the original generation was too short.
How do I export the finished video?
When the timeline is assembled, export it. Exports are server-rendered as landscape 16:9 or portrait 9:16 files, and every video export carries embedded provenance metadata written into the MP4 container's metadata. Video rendered here also carries a C2PA signature, which cryptographically binds that provenance to the file so it can be verified later. You download the file and post it yourself — PrismPoster does not publish for you. The full export flow, including per-platform previews, is in previews and exports.
Frequently Asked Questions
Do I need a paid plan to use the timeline editor?
Video generation itself is not paid-only — it runs on every plan, including Free, where it's credit-gated rather than tier-locked. The Free plan's 150 shared starter credits (pooled across image, music, and video) stretch to about three 5-second 480p clips, so you can generate short shots without a paid plan. The multi-track timeline editor is on every plan too: assembling, cutting, and finishing clips on the timeline is not tier-locked. What the Creator plan and above add is premium 1080p and 4K resolutions, a larger monthly video allowance, and the credits to reach them. See video resolutions for what each plan unlocks.
Can I make a clip longer than I originally generated?
Yes. Use extend-video to continue a shot from a trailing reference clip, which adds footage that carries on from the end of the existing clip.
What format does the exported video come out as?
Server-rendered landscape 16:9 or portrait 9:16, with embedded provenance metadata on every plan plus a C2PA signature on video rendered through the timeline editor. You download the file and post it manually.