Video · Free browser tool
FFmpeg command generator: trim, resize and audio
Choose a recipe, enter local filenames and settings, then review and copy the command. Commands are for Bash/zsh and use -n to avoid overwriting output. This page never executes FFmpeg.
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How to use it
- 01
Choose a task
Trim by re-encoding, fit a video inside an even-pixel canvas, extract WAV, or print silence/loudness measurements.
- 02
Enter settings
Use local filenames, a separate output and valid times/dimensions. The video recipes select the first video and optional first audio stream.
- 03
Review and run locally
Install FFmpeg from its official distribution, inspect the command, and run it in your terminal. Check the actual output.
A worked example
An accurate-trim recipe with start 10 seconds and duration 5 seconds decodes the source and creates a new five-second segment. It is slower than stream copy and cuts still align to video frames.
What to check
- The command assumes Bash/zsh, including a suitable WSL environment; quoting is not intended for Windows Command Prompt or PowerShell.
- The available FFmpeg codecs and filters depend on your installation. Unusual media can require additional options.
- A measurement command prints a log and creates no media file. The page does not inspect the file on your disk.
Questions
Why do the commands use -n?
FFmpeg exits if the output already exists. Rename the output for a new version rather than silently replacing a source file.
Is a re-encoded trim lossless?
No. The trim recipe uses H.264/AAC encoding. Stream copy avoids that encoding but can cut differently around keyframes and is not the recipe used here.
Continue the workflow
Sources and format guidance
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