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Video Concat

Video Concat · screenshot coming soon

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What this node does

Video Concat takes several upstream clips and stitches them into one clip. It has an autogrow videos input (up to 12 slots) plus a reorder strip in the node body: drag the clips into the sequence you want, and that order is stored in the hidden clip_order field. Slots you leave empty are skipped. This is a real render, not a browser-side trick. On ▶ Run the server re-encodes the clips (PyAV / ffmpeg) into one MP4 and saves it as a project snapshot. You need at least two non-empty clips or the run errors out. The input and output are COMFYTV_VIDEO.

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When to use it

  • Assemble separately generated shots (e.g. several Video Stage results) into one sequence.
  • Put an intro, a main clip, and an outro together into one deliverable.
  • Chain trimmed pieces from Video Split / Video Clip back into a single timeline.

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Parameters

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videos

Autogrow list of clip slots (up to 12). Wire each upstream COMFYTV_VIDEO into a slot; new slots appear as you fill them. Empty slots are ignored.

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clip_order (hidden)

A JSON list of the video slot keys in concat order. You don’t edit this by hand — it is driven by the reorder strip in the node body. Any wired clip not listed there is appended after the ordered ones.

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Outputs

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Tips

  • Clips with different resolutions/frame rates are normalized during the re-encode; for the cleanest result, feed clips that already share a size and fps.
  • Order comes from the reorder strip, not from the slot numbers — rearrange there.
  • Fewer than two non-empty clips is an error; wire at least two.

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Bridge note

COMFYTV_VIDEO is a project snapshot reference, not a native ComfyUI tensor. To move between ComfyTV and native ComfyUI video nodes, insert a Bridge (ComfyTV/Bridge). See https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md.
  • Video Clip — trim a single clip before concatenating.
  • Video Split — cut one clip into two pieces you can rejoin.
  • Mux Audio — replace or mix the audio track after assembling the sequence.