Change Video Speed: Speed Up or Slow Down Any Part
To change a video’s speed in Valmera, upload it and say what you want: “play 3:10 to 5:40 at 2×” or “slow the pour down to 0.7×.” The AI agent sets that stretch of footage to any speed from 0.25× to 4×. Voices keep their natural pitch, and captions, music, zooms and sound effects shift to the new timing automatically.
Speed belongs to the footage, not to a spot on the timeline, so a 2× section stays on the same moments when you cut something earlier. The agent reports the new runtime after each change, and any range can go back to normal speed with one message.
Set the Pace in One Message
Upload, describe the speed change, review the preview. Creating an account and uploading are free; editing requires a subscription.
Create an account →How to Change Video Speed in Valmera
- 1Upload your videoMP4, MOV, M4V, MKV or WebM, up to 14 GB and 3 hours. Indexing builds a word-level transcript and finds the shots, so you can name moments by what happens.
- 2Describe the changeBy timestamp (“2× from 3:10 to 5:40”) or by content (“speed up the part where I set up the tripod”). Several ranges can go in one message.
- 3Let the agent apply and check itIt sets each range, re-anchors music, zooms, overlays and sound effects, reports the new runtime, warns if slow motion will step, and renders a preview it checks before replying.
- 4Adjust and export“A bit slower,” “put the intro back to normal.” When it looks right, export a full-resolution MP4 rendered from your original file.
Speed the whole video up to 1.2× and keep my voice natural.Play 3:10 to 5:40 at 2×, then slow the moment I catch the ball to 0.7×.Speed up the screen recording I inserted so it plays in 5 seconds instead of 10.Freeze on the reveal for 3 seconds, blurred and darkened, with the words “Before → After”.Pick the Right Speed
| Speed | How it looks and sounds | Good for |
|---|---|---|
| 0.25×–0.5× | Very slow; motion visibly steps because frames repeat | A brief stylized beat, if the stutter suits it |
| 0.6×–0.8× | Gentle slow motion; the smoothest slow range | Reveals, pours, a jump, a reaction |
| 1.1×–1.25× | Barely noticeable; speech sounds a little brisker | Tightening a slow talker across the whole video |
| 1.5×–2× | Clearly faster, still easy to follow | Screen recordings, setup steps, unboxing |
| 3×–4× | Timelapse feel; speech gets hard to follow | Long processes, travel, building, cleaning |
Need more than 4×? Cut part of the range instead. And for talking footage, removing dead air usually tightens the pace more naturally than speeding up the voice; the two combine well, such as cutting the pauses and then running the b-roll at 2×.
Speed Ramps and Multiple Ranges
Each range plays at one constant speed, and ranges can sit side by side: 1× through your intro, 2× through the setup, 0.7× on the reveal, back to 1× for the reaction. That stepped sequence is how Valmera builds a speed ramp; the speed changes at each boundary instead of easing along a curve.
Ranges are anchored to the original recording, so they survive later cuts. A new range that overlaps an existing one replaces it, and the agent says which one it replaced. A range needs at least 0.2 seconds of footage. When the timing shifts, captions follow the words as they are now spoken, b-roll and title cards stay at their cut, and music, overlays, zooms and sound effects re-anchor automatically.
Slow Motion: What to Expect
Valmera slows footage by showing each real frame for longer; it does not generate in-between frames. Down to about 0.6× that reads as natural slow motion. Below 0.6× motion visibly steps, and the agent warns you before you approve it. For the smoothest result, stay between 0.6× and 0.8×, or shoot at 60 fps or more when you plan to slow a moment down: more real frames means less repetition.
Inserted Clips and Freeze Frames
Speed ranges apply to your main footage. A clip you have spliced in, such as b-roll or a screen recording, has its own playback rate from 0.25× to 4×, changed in place: a 10-second screen recording at 2× becomes a 5-second scene with nothing cut, its audio pitch-corrected. When the screen recording is your main video, speed through the waiting and typing, then add cursor enhancement so the pointer stays easy to follow.
To stop time instead of slowing it, add a freeze frame: the picture holds on one moment, usually for 2 to 4 seconds, optionally blurred and darkened behind big centered text, with a slow drift so it doesn’t sit dead. Either the program pauses on it (everything after shifts later) or the speech keeps running under the held picture.
Limits
There is no optical-flow or AI frame interpolation, so slow motion below 0.6× steps. Each range holds one constant speed: ramps are stepped, not eased curves. Speeds run from 0.25× to 4×, there is no reverse playback, and speed ranges apply to the main footage while inserted clips use their own rate.
Where Speed Fits
Speed is a pacing tool. Pair it with cuts, punch-ins and captions in the same chat, and see the speed and motion docs for how spans, zooms and transitions interact. Creating an account and uploading are free. Editing requires a subscription — see plans.
Using Claude, ChatGPT or Cursor? The same set_speed, set_insert_window and add_freeze_frame tools are available through Valmera's MCP server.
Frequently Asked Questions
Made with Valmera: real exports
Change the Speed by Describing It
Upload your video, name the ranges and speeds, review the preview, export a full-resolution MP4. Creating an account and uploading are free; editing requires a subscription.
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