LeCoqRoti
Trimma runs on any Intel Mac with macOS 10.14.6 or later.
Purpose — a focused tool for making cuts in video files, nothing more. It does not re-encode unless you ask it to, which keeps the work fast and the output faithful to the source.
Cutting — add or remove edit points with the toolbar, or use the A and S keys. The interface responds to cursor-key stepping for frame-accurate placement, and a frame counter appears in the details panel while you scrub or adjust a cut.
Passthrough export — hands the original stream through to a new container without touching the encoding. The operation completes quickly because no pixels are re-processed.
Re-encoding — when trimming demands a new encode, Trimma offers AVC (H.264) and HEVC (H.265) export. The choice is yours when passthrough is not possible or when a smaller file is preferred.
Output folder: keep originals safe with a dedicated export location
Trimma keeps its preferences sparse — a single pane with a few decisions that affect daily use immediately.
The default output folder is the source file's location. If you prefer to keep originals untouched, switch it to a dedicated export directory. A small change, but it prevents accidental overwrites when you work fast.
Keyboard shortcuts for adding and removing cuts are set to A and S out of the box. Left-handed users or anyone migrating from another cutter may want to reassign them. The preference pane accepts single-key entries, so remapping takes seconds.
Thumbnail export quality defaults to low — sensible for quick previews, but worth raising a notch if you send rough cuts to clients. The slider offers four steps, and the difference between the bottom two is visible on a Retina display without adding much file weight.
Passthrough speed: two hours of cuts in under ten seconds
Passthrough export lives up to its description. A two-hour recording with three cuts completes in under ten seconds on modest hardware — essentially a disk copy with new chapter markers written into the container. The progress bar appears and vanishes before you can read it.
HEVC encoding is predictably slower. On an older Intel MacBook the app saturates two cores and stays below 60°C after twenty minutes of sustained work. Memory use hovers around 180 MB whether you are scrubbing a thirty-second clip or a feature-length file. No leaks after leaving the app open overnight with a loaded timeline.
The interface draws its timeline from the video's keyframe structure rather than decoding every frame on the fly. This keeps scrubbing responsive even with 4K H.264 material on integrated graphics. Dropping a dozen cuts into a long file causes no perceptible lag — the toolbar buttons remain immediate, and the details panel updates the frame counter without stutter.
Event turnaround: three hours of footage, no import dialog
Consider someone who returns from a conference with three hours of tripod footage. The brief is simple: remove the coffee breaks, keep the keynotes, deliver by morning.
They open the file in Trimma. No project library, no import dialog — the video appears in the viewer immediately. Dragging the playhead to the end of a talk, they press A to mark a cut point. A few minutes of scrubbing with the cursor keys places the second cut at the start of the next session. Two more cuts bracket the afternoon Q&A. The timeline shows exactly four edit decisions, and nothing else.
Passthrough export produces a clean file in seconds. The original bitrate and colour profile are intact, so there is no mismatch when the clip joins other deliverables in a timeline downstream. The videographer drops the result into a shared folder and closes the laptop. No encoding queue, no render bar, no project file to archive.
In short: a single-purpose trimmer that respects the source material and stays out of the way.
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