> ## Documentation Index
> Fetch the complete documentation index at: https://comfytv.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Video Concat

> Join two or more clips end-to-end into a single continuous video, in an order you control.

<Frame caption="Video Concat · screenshot coming soon">
  <img src="https://mintcdn.com/comfytv/dMkMxJDZdIo4YzAU/images/nodes/_placeholder.svg?fit=max&auto=format&n=dMkMxJDZdIo4YzAU&q=85&s=b54171099e5b02d4313fe581171ebbcc" alt="Video Concat" width="800" height="450" data-path="images/nodes/_placeholder.svg" />
</Frame>

## 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`.

## 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.

## Parameters

### 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.

### 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.

## Outputs

| Output    | Type            | Meaning                                              |
| --------- | --------------- | ---------------------------------------------------- |
| **video** | `COMFYTV_VIDEO` | The single joined clip, saved as a project snapshot. |

## 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.

## 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](https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md).

## Related nodes

* **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.