Script Download Facebook Video Repack

Facebook updates its frontend every few weeks. To keep your script download Facebook video repack working:

Graph API alternative:

curl -X GET "https://graph.facebook.com/v18.0/VIDEO_ID?fields=source&access_token=YOUR_TOKEN"

This returns a direct download URL.

When you download a Facebook video without repacking, you may end up with:

Repacking means:

FFmpeg does this in one line:
ffmpeg -i video_only.mp4 -i audio_only.m4a -c copy final_repacked.mp4

The scripts above automate this.

If you don’t want to maintain a fragile script, use yt-dlp – a command-line tool that already handles Facebook repacking perfectly:

yt-dlp -f best "https://fb.watch/xxxxx/" -o "repacked_%(title)s.%(ext)s"

It automatically finds the HD stream, repacks it, and handles cookies. script download facebook video repack

To build an effective download script, you must understand Facebook’s delivery architecture:

Encryption – Some videos are encrypted with Widevine or Clear Key, requiring decryption before repacking.

Repacking is critical because raw downloaded segments are often not playable as-is. Here’s why:

| Raw downloaded content | After repack | |------------------------|---------------| | video-init.mp4, video-seg-1.m4s, video-seg-2.m4s … | Single output.mp4 with correct moov atom | | Separate audio/video files | Muxed together | | Fragmented MP4 (no seeking table) | Fast-start / web-optimized MP4 |

Using a script to download Facebook videos falls into a gray area. Always consider: Facebook updates its frontend every few weeks

Do NOT:

Do:

Facebook’s Terms of Service (3.2) prohibit scraping without permission. However, personal, non-automated use for a single video is rarely enforced. If you run batch scripts on a large scale, use proxies and rate-limiting delays.

Config: YAML or TOML for defaults (output dir, ffmpeg options, concurrency)

Example batch input (CSV/JSON)

Tests: unit tests and integration test stubs

Dockerfile for reproducible runtime

README with usage and examples