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Merge MP4 Files with FFmpeg

Join multiple MP4 files using the concat demuxer.

Command

Use this when

  • You have multiple clips from the same camera or export settings.
  • You want a fast merge without re-encoding.
  • You can create a files.txt list in the same folder.

Customize it

Create FFmpeg concat commands for joining video files, with copy and re-encode options.

Open Merge Videos

Parameter breakdown

-f concat

Uses FFmpeg concat demuxer mode.

-safe 0

Allows paths in the file list that may otherwise be rejected.

-i files.txt

Reads input file names from a text file.

-c copy

Copies streams without re-encoding for speed and no generation loss.

Variants

files.txt example

Re-encode mismatched clips