This script is a robust automation tool designed to bulk-repair MP4 files across your directory and its subfolders. It leverages FFmpeg to fix container issues without degrading video quality.

Here is exactly how it handles the workflow:

• Smart Recursive Scanning
  The script starts by mapping the current directory tree. It looks for every .mp4 file but applies an intelligent filter: it automatically ignores files that have already been repaired (ending in _fixed) or marked as corrupt (_BROKEN), preventing duplicate work.

• Non-Destructive Repair
  Instead of re-encoding the video—which takes time and lowers quality—the script uses the ffmpeg -c copy command. This simply copies the video and audio streams into a fresh container, effectively rebuilding the file structure and fixing common header errors instantly.

• Safety and Verification
  It operates with a “safety-first” logic. The original file is renamed to _BROKEN only if the FFmpeg repair process returns a success code. If the repair fails, your original file remains untouched, ensuring you never lose data due to a script error.

  Download the script