> ## 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 Volume > Adjust a clip's audio level and add fade-in / fade-out at the head and tail. Video Volume ## What this node does **Video Volume** changes the loudness of a clip's audio track and can ramp it up at the start (**fade\_in\_s**) and down at the end (**fade\_out\_s**). The picture is untouched. It's a real re-encode on the server (PyAV / ffmpeg), so it runs on **▶ Run** and saves the result as a project snapshot. Input and output are `COMFYTV_VIDEO`. ## When to use it * Bring a too-quiet or too-loud clip to a usable level before mixing. * Add a gentle fade-in at the start and fade-out at the end so cuts don't pop. * Duck a clip's own audio (volume below 1.0) before layering music with Mux Audio. ## Parameters ### volume Gain multiplier applied to the audio. Range **0.0–8.0**, step 0.05, default **1.0**. 1.0 leaves the level unchanged; 0.0 mutes; 2.0 is roughly twice as loud. Large values can clip — push carefully. ### fade\_in\_s Length of the fade-in ramp at the start, in seconds. Range **0–60**, step 0.1, default **0.0** (no fade). The audio rises from silence to the target level over this time. ### fade\_out\_s Length of the fade-out ramp at the end, in seconds. Range **0–60**, step 0.1, default **0.0** (no fade). The audio falls to silence over this time before the clip ends. ## Outputs | Output | Type | Meaning | | --------- | --------------- | ------------------------------------------------------------------ | | **video** | `COMFYTV_VIDEO` | The same picture with adjusted / faded audio, saved as a snapshot. | ## Tips * volume = 0.0 fully mutes the track (useful for silencing while keeping the fades slots). * Fades apply to the clip's own edges; if you want them to line up with a cut, split/trim first, then fade. ## Bridge note `COMFYTV_VIDEO` is a project snapshot reference, not a native ComfyUI tensor. To move between ComfyTV and native ComfyUI 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 * **Mux Audio** — replace or mix in a different audio track. * **Video Speed** — retime the clip (with pitch-compensated audio).