OpenShot 4.0.1 Razor tool vs a hosted trim: exact or keyframe
OpenShot 4.0.1 upgrades its Razor cutting tool. Sume's video-trim cuts a clip by start and duration, exact (re-encode) or keyframe (stream copy), at $0.02.
OpenShot's 2026-09-27 post describes 4.0.1 as having a major upgrade to the Razor tool, faster color and animation editing, timeline controls that stay in reach as you zoom, and an official Linux Snap package. If your cuts are repeatable rather than hand-placed, Sume's POST /v1/video-trim takes a start and a duration and returns a new MP4. The choice that matters is precision: exact or keyframe.
Exact or keyframe
exact is the default and re-encodes with libx264 in yuv420p, so the cut lands on the frame you asked for. keyframe stream-copies, which is faster and keeps the source encoding, but can only start at a keyframe, so the result reports actual_start_seconds. The audio can be kept or dropped, and output sets width, height and fps for exact cuts only.
| Question | OpenShot 4.0.1 Razor | Sume video-trim |
|---|---|---|
| Placement | Razor tool, per the post | start plus end or duration, 0.2 to 900 s |
| Frame accuracy | Not stated in the post | exact mode |
| Fast copy | Not stated in the post | keyframe mode |
| Price | Not stated in the post | $0.02 per job |
Doing many cuts
Because every call needs an Idempotency-Key, a loop over a list is safe to retry. Sources must be Sume-hosted, source length is limited to 1800 seconds, and output to 900 seconds.
Honest limits
- A script has no preview, so check one result before running a batch.
- Trim does not accept raw ffmpeg fields; they fail as
ffmpeg_fields_rejected. - OpenShot's post does not say what the Razor upgrade changes in detail.
Sources
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Written by Sume