Trim a video
avconvert ships with the system and trims without re-encoding, so it takes seconds and loses no quality: give it where to start and how long to keep.
Without Terminal
- Open the video in QuickTime Player.
- Choose Edit → Trim.
- Drag the yellow handles to the part you want, click Trim, then File → Save.
In one command
Keep 10 seconds, starting 5 seconds in:
avconvert --source video.mp4 --preset PresetPassthrough --output trimmed.mp4 --start 5 --duration 10Passthrough cuts on the nearest keyframe, so the start can land a fraction of a second early. For a frame-exact cut, use a preset like PresetHighestQuality instead — slower, because it re-encodes.
Or just ask Titan
Cut this video down to just the part from 0:05 to 0:15.Do it with Titan
Titan is an AI that lives on your computer: tell it what you need and it does it while you watch — you press Return, nothing runs by itself. What is Titan?
Titan isn’t on this computer yet. Get Titan, then press the button again — the task will be waiting, typed in.