Ssis-988.mp4 ⟶ 〈EXTENDED〉

The file sat in the dusty "Completed" folder, untouched for three years. To anyone else, SSIS-988.mp4 was just a string of characters—a catalog number, a ghost in the digital machine. But to Kenji, it was the last heartbeat of a dream.

# Check if the file exists if not os.path.exists(video_file_path): raise FileNotFoundError(f"The file video_file_path does not exist.")

What is SSIS?

• Inconsistent timestamps (creation date after modification date, or impossible dates) may indicate tampering.
• Camera model or editing software fields indicate origin (e.g., GoPro, iPhone, Adobe Premiere).
• Presence of subtitles, chapters, or closed-caption tracks can reveal context.
• Unusual metadata fields or very recent encoder versions may suggest re-encoding or obfuscation.