Video Assembly API

A video assembly API is the seam between raw media and a shippable file. You send it clips, an audio track, captions, and an order to put them in; it renders and returns one video. It exists because timeline editing does not belong inside product code: no engineer wants to ship an FFmpeg build, manage codecs, or babysit a render farm just to concatenate two shots.

The standard pattern splits the job in two. One API generates or hosts your footage, a second API assembles it, and you write glue code to move files between them. This page is built around collapsing that seam. The flow linked here is the literal assembly graph: a Scene Brief text node, two Seedance 2.0 nodes that render each shot, and a Video Concat node that stitches them into a single MP4. Generation and assembly are one graph, one call, one output URL, the same way an AI video editing API keeps editing operations inside the pipeline instead of a separate service.

Open the flow and the whole pipeline is on one canvas, nothing hidden behind a JSON schema.

• Scene Brief holds the intent. A Text Input node with one line describing the shots, the default reads: two product scenes, a studio hero shot then a splash close-up.
• Two Seedance 2.0 nodes render the shots. Each is a text to video node that turns its prompt into a short clip on hosted compute, so the source footage is generated inside the graph rather than uploaded from somewhere else.
• Video Concat assembles the output. It takes both clips on its two video inputs, joins them in order, and returns one MP4 whose URL is the graph's output.

Keeping generation and assembly in one graph is the point: there is no glue code moving files between a generator API and an editor API, and no intermediate storage to manage. Because the graph is versioned server-side, the same call produces the same structure every run, which is what separates a reproducible pipeline from a one-off script, the same property that makes a no-code workflow with API access safe to call from production. The honest tradeoff: a graph of generation plus assembly nodes is heavier than a bare concat call, so when you already hold finished clips and only need to join them, a lighter dedicated concat step is the better fit.

Wireflow assembles and generates video; it is not a frame-accurate non-linear editor. If your job is keyframe animation, precise multi-track timeline trimming, complex transition libraries, or template-driven bulk edits over footage you already own, a purpose-built video-editing API such as Shotstack, Creatomate, or JSON2Video is built for exactly that and will feel more direct. Those tools assume the clips already exist and give you fine timeline control; Wireflow's advantage is upstream, generating the clips and assembling them in the same reproducible graph.

A few more honest limits. Runs are metered: building on the canvas is free, but every generation and render costs credits, so an unattended assembly loop is a spend decision to cap. Wireflow is the media layer, not the reasoning brain, so it does not write your script or decide the edit; you or your agent bring that. And output is finished video files, not editable project files, so this feeds a final render rather than replacing an editor's timeline. If you want to weigh the field first, the best AI video editing API tools roundup covers where a generate-and-assemble graph wins and where a dedicated editor does.