Debugging tool

FFmpeg Error Explainer

Paste an FFmpeg error message to identify likely causes, practical fixes, and related commands. The analysis runs locally in your browser.

Paste FFmpeg output

Likely meaning

Your FFmpeg build does not include the libx264 encoder.

Why it happens

Some FFmpeg builds are compiled without GPL encoders such as libx264. The command is valid, but your local FFmpeg binary cannot use that encoder.

Try this

Install a full FFmpeg build that includes libx264.
On macOS with Homebrew, reinstall FFmpeg with the standard formula.
Use another available encoder such as h264_videotoolbox on macOS or a built-in MPEG-4 encoder as a fallback.

Example command

ffmpeg -encoders | grep 264

Your pasted error text is matched in the browser against common FFmpeg error patterns.

Each result explains what probably happened and suggests concrete next steps.

Open a related command generator when the fix requires changing your FFmpeg command.