> ## Documentation Index
> Fetch the complete documentation index at: https://comfytv.org/llms.txt
> Use this file to discover all available pages before exploring further.
# Strobe
> Replaces frames on a regular interval with black, white, or a held frame for a strobing pulse, in one ▶ Run.
## What this node does
**Strobe** punches a repeating pattern into a `COMFYTV_VIDEO`: every Nth frame is swapped for solid black, solid white, or a held copy of a frame, giving a flicker/strobe rhythm. It writes a new snapshot on **▶ Run**.
In and out are both `COMFYTV_VIDEO`. To feed native ComfyUI nodes, insert a **Bridge** — see the [bridge guide](https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md).
## When to use it
* Add a rhythmic flicker synced to a beat or an edit accent.
* Create a stuttering hold effect (freeze every few frames).
* Build a hard black/white strobe for a club or horror moment.
## Parameters
### interval
Frames between strobe hits, `1`–`120`, default `3`. Smaller = faster, more frequent strobing; `1` affects every frame.
### strobe\_mode
What the struck frames become. Options: `black` (solid black), `hold` (freeze/hold a frame), `white` (solid white). Default `black`.
### invert
Flips which frames are struck versus passed through (inverts the on/off phase of the pattern). Default off.
## Outputs
| Output | Type | Meaning |
| --------- | --------------- | ------------------------------------------ |
| **video** | `COMFYTV_VIDEO` | The strobed clip as a new project snapshot |
## Tips
* Match **interval** to your frame rate and beat to lock the flicker to music.
* Use **invert** to swap which frames flash without changing **interval**.
* `hold` gives a stutter-freeze feel, while `black`/`white` give a hard flash.
## Related nodes
* **Glitch FX** — random digital corruption instead of a regular pulse.
* **Feedback FX** — trailing/echo motion for a different temporal effect.