Script Download Facebook Video Repack

| Problem | Likely cause | Solution | |---------|--------------|----------| | 403 Forbidden | Expired or missing cookies | Export fresh cookies from browser (e.g., using EditThisCookie) | | Audio/video out of sync | Different segment durations | Use ffmpeg with -async 1 or -vsync during repack | | Corrupted output | Incomplete download of segments | Implement retry logic or use aria2c for segmented download | | Cannot find video URL | Facebook’s page structure changed | Inspect network tab in DevTools; update script regex |

# Install yt-dlp and ffmpeg
pip install yt-dlp
sudo apt install ffmpeg   # Linux
brew install ffmpeg       # macOS

Downloading Facebook videos via script may violate Facebook’s Terms of Service (Section 3.2: “You will not … collect users’ content or information … using automated means”). script download facebook video repack

Although not exclusively for Facebook, these scripts support Facebook video extraction. | Problem | Likely cause | Solution |

Example using yt-dlp (active fork):

yt-dlp -f bestvideo+bestaudio --merge-output-format mp4 "https://www.facebook.com/example/videos/123456"

Behind the scenes:
yt-dlp parses Facebook’s page, extracts DASH manifests, downloads segments in parallel, and uses ffmpeg to repack (concat demuxer + copy codec). # Install yt-dlp and ffmpeg pip install yt-dlp

A typical script (Python, Node.js, or shell-based) performs the following: