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Retime Every Clip in a Batch — Pitch-Preserving Speed-Up or Slow-Down

Give a whole batch of clips a punchier tempo (or a slower, more deliberate feel) in one node. Video Speed retimes every clip in the input list by a single playback speed factor — 1.0 leaves the clip unchanged, values above 1.0 make it faster and shorter, values below 1.0 make it slower and longer. Crucially, audio pitch is preserved (no chipmunk voices at 1.5×, no low-and-slow effect at 0.5×) so speech stays natural at any speed.

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What it does

Video Speed retimes each clip in the input list by a single playback speed factor. The video is resampled to run faster or slower, and the audio is time-stretched using a pitch-preserving algorithm so voices, music, and sound effects keep their natural pitch even at very different speeds. Applied uniformly across every clip in the input list; the output is a list of retimed clips with new (shorter or longer) durations..

Problem it solves

• Snappier pacing across a batch – Boost the tempo of a whole batch of highlight clips to feel more energetic without editing them one-by-one
• Pitch-preserved speech – Speed up talking-head content without the audio sounding sped-up; slow it down without dragging the pitch down. Uses time-stretching (not simple resampling).
• Retention lift on long clips – Even a modest 1.1× – 1.25× speed-up materially shortens clips and lifts retention on social platforms
• Slow-mo emphasis – Slow specific hero clips to 0.5× – 0.75× to draw attention to key moments while keeping the audio understandable
• Timelapse-style compressions – Aggressive speed-ups (2× – 4×) create montage-like tempo shifts for B-roll or process content
• Consistent tempo across a series – Applying the same speed factor to every clip in a series creates a uniform editorial rhythm
• Complement to Remove Dead Zone – Where Remove Dead Zone cuts silent gaps, Video Speed compresses the spoken content itself for extra pacing

Input/Output

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• Input: List of video clips
  • Format: A list of video clips (typically from Video Trim, Remove Dead Zone, Video Reframe (9:16), or any upstream clip-producing node)
  • Audio requirement: Clips with speech benefit most from pitch preservation; clips with music also stay musical (pitch stays on-key) </aside>

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• Output: List of retimed clips
  • Format: Same list shape as input — one output clip per input clip
  • Length: Each output clip's duration = original duration ÷ speed factor
    • Speed 2.0 → clip becomes half as long
    • Speed 0.5 → clip becomes twice as long
  • Audio: Pitch-preserved through time-stretching — voices stay natural, music stays on-key
  • Sync: Audio and video remain in sync at the new tempo </aside>

Configuration Options

• Playback speed factor: How much to speed up or slow down each clip. Applied uniformly to every clip in the batch.
  • UI: Slider — drag to the desired speed factor; the current value is shown to the right
  • Default: 1.0 (no change — clips pass through untouched)
  • > 1.0: Faster / shorter
  • < 1.0: Slower / longer
  • Reference points:
    • 0.5 – Half-speed / slow-motion feel; good for hero moments and emphasis (audio stays understandable thanks to pitch preservation)
    • 0.75 – Deliberate, thoughtful pacing; useful for educational content or emotional beats
    • 1.0 (default) – Original tempo; clips pass through unchanged
    • 1.1 – 1.25 – Subtle speed-up; often unnoticeable but meaningfully shortens clips (great retention lift for talking heads)
    • 1.5 – Noticeably snappier; energetic feel for social short-form
    • 2.0 – Double-speed; punchy montage tempo (speech still understandable if the original was clear)
    • 3.0 – 4.0 – Timelapse / B-roll compression; speech becomes hard to follow at this range — use for B-roll or process content only

How to Use

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1. Load a list of clips → Connect an upstream clip-producing node (typically Video Trim or Remove Dead Zone) to Video Speed
2. Set the speed factor → Drag the slider to the desired playback speed
   • 1.0 (default) leaves clips unchanged
   • Push above 1.0 for faster / shorter
   • Drop below 1.0 for slower / longer
3. Run Flow → Every clip in the list is retimed uniformly; audio pitch is preserved regardless of speed </aside>

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