Trimma User Guide

Learn how to use Trimma to cut, trim, and export your video and audio files

Getting Started

Trimma is a powerful yet intuitive video and audio processing application for macOS. This guide will walk you through all the features and operations you need to master Trimma.

1. Timeline at the Bottom

The timeline shows two things:

  • The preview of the media for good orientation together with the current location
  • The parts of the media that are to be removed or to be kept

In order to define those parts, Trimma allows for adding Cuts. Cuts either start or end a segment of the video that's to be removed or kept.

Timeline Interface

Basic Operations

2. Keep Whole Media

This operation will clear everything from the timeline as if you start from scratch.

Toolbar Button: Keep All

Keep All Operation

3. Remove Whole Media

In situations where most of the media is to be discarded, Remove All creates a good starting point.

It will create a segment from start to stop that will be removed. Add cuts into this segment to mark the beginning of a segment that's to be kept.

Toolbar Button: Remove All

Remove All Operation

4. Add Cut

This is the most important operation. Inserting a cut can mean two things:

  • If the cut is made on a section that's kept, the rest of the video is marked for removal
  • If a cut is made in a section that's marked for removal, the rest of the video is marked to be kept

You can perform the most common tasks by simply going through the video and adding cuts as you go.

Toolbar Button: Add Cut

Add Cut Operation

5. Remove Cut

If the current location is inside a section to be removed, Remove Cut will remove this section.

Toolbar Button: Remove Cut

Remove Cut Operation

6. Split

If you want to split the medium into multiple media, you can use this button to mark a split. You can also insert two cuts to create a longer section to be removed, but a split would have no duration.

Toolbar Button: Split

Split Operation

Export Operations

7. Export Whole Medium

This is the most common operation to export the final medium. It will combine all sections that are marked to be kept and put them into a new file.

Toolbar Button: Export

Export Operation

8. Export Parts

In situations where you want to split a medium into multiple smaller clips, use this function to export all clips at once.

Toolbar Button: Export Parts

Export Parts Operation

Command Line Interface

Trimma also provides a powerful command-line interface for automation and batch processing.

Common Commands
# Export video with H.264 preset
trimma --input video.mp4 --output output.mp4 --preset H264

# Export multiple clips at split points (creates clip - part 1.mp4, clip - part 2.mp4, etc.)
trimma --input video.mp4 --split-export output/clip.mp4 --split 00:01:30.500 --split 00:02:45.250

# Trim video with specific cuts
trimma --input video.mp4 --output trimmed.mp4 --cut 00:00:30.123 --cut 00:01:15.789