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Audio Trim

Audio Trim · screenshot coming soon

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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.

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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

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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.

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Types (COMFYTV_* vs native ComfyUI)

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Parameters

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audio (input, optional)

Source COMFYTV_AUDIO. Wire this or video.

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video (input, optional)

Source COMFYTV_VIDEO; its audio track is trimmed.

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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.

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Outputs

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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).

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Repository and workflows

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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.
  • 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