Video Concat

Node type: utility:video_concat
Category: Data

Description

Concatenates video clips into one MP4, in order, via a server-side ffmpeg step. There are two ways to supply the clips:

• Array (clips): wire an iterator's collected clips or a Media Splitter segments array into the clips port to stitch N clips in array order. This is the way to reassemble the output of a fan-out (e.g. one talking-avatar clip per script slice) back into a single video.
• Discrete ports (video_1..video_6): wire 2 to 6 clips individually; unwired ports are skipped and the wired ones concatenate in port order.

When clips is wired it takes precedence and the discrete ports are ignored (no silent merge of the two). At least 2 clips are required, and at most 12: past the cap the node fails loud rather than truncating. The node fails loud in general: a failed concat returns an error, never a partial result.

The clips array accepts elements that are a bare URL string or a { url } / { video } / { videoUrl } object; each element is one clip. Each discrete port accepts the same shapes, or an array of them (the first resolvable element is used, since a discrete port expects one clip).

Canvas ports

These appear as port handles on the left side of the node.

ID	Label	Details
clips	Clips (array)	ARRAY. An ordered list of clips; overrides the ports below.
video_1	Video 1	VIDEO (required)
video_2	Video 2	VIDEO (required)
video_3	Video 3	VIDEO
video_4	Video 4	VIDEO
video_5	Video 5	VIDEO
video_6	Video 6	VIDEO

Sidebar config

These render as form fields in the right-side config panel when the node is selected.

No sidebar config fields.

Outputs

ID	Label	Type
video	Concatenated Video	VIDEO

Notes

• Between 2 and 12 clips. Fewer than 2 or more than 12 is an error, not a truncation.
• clips (the array port) wins over video_1..video_6 when both are wired. They are never merged.
• The re-encode can take minutes for long reels; the node waits for completion.
• The 12-clip cap keeps the concat inside the clipper Lambda's budget (2GB / 300s, 512MB /tmp).

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Auto-generated from the Wireflow node registry (this page hand-edited for the clips array port).