> ## Documentation Index
> Fetch the complete documentation index at: https://comfytv.org/llms.txt
> Use this file to discover all available pages before exploring further.
# Audio Trim
> Cut audio to a [start_s, end_s] range on a waveform timeline. Accepts audio or video input; emits a single trimmed audio snapshot.
## What this node does
**Audio Trim** cuts **\[start\_s, end\_s]** out of an audio source and drops the rest. The card shows a waveform with draggable in/out handles and a preview player, so you set the range by ear and eye rather than typing numbers. If **end\_s** is 0 or ≤ **start\_s**, the range extends to the source end.
It accepts either a `COMFYTV_AUDIO` input or a `COMFYTV_VIDEO` input — wire a video and it trims that video's audio track directly, no demux step needed.
## When to use it
* Cut a generated music track down to your film's length
* Isolate the usable take from a long speech/vocal generation
* Pull a section of a video's soundtrack without demuxing first
## How ComfyTV designed this
* **Stage** + **▶ Run**: re-trims the upstream snapshot only; downstream reads the trimmed output.
* **Waveform editing**: the in/out handles live on a shared media-trim timeline (the same interaction as video trim), with click-to-seek preview.
* **No GPU**: PyAV stream copy/re-encode on disk; output lands as a `/view?` URL snapshot.
## Types (COMFYTV\_\* vs native ComfyUI)
| ComfyTV type | What it is | vs ComfyUI |
| --------------- | ------------------------------------- | ---------------------- |
| `COMFYTV_AUDIO` | Audio URL snapshot | Bridge to/from `AUDIO` |
| `COMFYTV_VIDEO` | Video URL snapshot (audio track used) | Bridge to/from `VIDEO` |
## Parameters
### audio (input, optional)
Source `COMFYTV_AUDIO`. Wire this or **video**.
### video (input, optional)
Source `COMFYTV_VIDEO`; its audio track is trimmed.
### start\_s / end\_s
The kept range in seconds, set by dragging the waveform handles. `end_s` 0 → source end; must otherwise be > `start_s`.
## Outputs
| Output | Type | Meaning | Downstream |
| --------- | --------------- | ------------- | ------------------------------------ |
| **audio** | `COMFYTV_AUDIO` | Trimmed audio | Mux · Audio, Audio Mix, any Audio FX |
## Step by step
1. Run an upstream **Audio Stage** (or wire a video).
2. Add **Audio Trim**, wire the source.
3. Drag the in/out handles on the waveform; preview.
4. **▶ Run**; wire **audio** downstream (e.g. **Mux · Audio**).
## Full guides (recommended reading)
| Guide | Contents |
| ---------------------------------------------------------------------------------------- | ------------------------------- |
| [Video and audio](https://github.com/jtydhr88/ComfyTV/blob/main/docs/video-and-audio.md) | Clip, demux, mux, audio tooling |
## Repository and workflows
| Resource | Link |
| --------------------- | -------------------------------------------------------------------------------------------------------- |
| **GitHub repository** | [https://github.com/jtydhr88/ComfyTV](https://github.com/jtydhr88/ComfyTV) |
| **User guides index** | [https://github.com/jtydhr88/ComfyTV/tree/main/docs](https://github.com/jtydhr88/ComfyTV/tree/main/docs) |
## FAQ
**Q: Both audio and video wired?**\
A: The audio input wins; wire exactly one for clarity.
**Q: Does it re-encode?**\
A: Output is written as a clean audio file; sample rate follows the source.
## Related nodes
* **Audio Split** — cut one source into two parts at a point
* **Demux · Audio Track** — extract audio without trimming
* **Mux · Audio** — put trimmed audio onto a video