: Use ffmpeg -i tango_part3.mp4 -vf "negate" output.mp4 to invert colors or extract every frame to a folder for automated scanning: ffmpeg -i tango_part3.mp4 thumb%04d.jpg -hide_banner Summary of Findings
: Switch from Waveform to Spectrogram. Flags are frequently drawn into the audio frequencies (Visual Audio Steganography). tango part3mp4
: If the file was suspected to be a JPEG hidden inside the MP4, or if there's an embedded image. : Use ffmpeg -i tango_part3
What to look for : Look for unusual comments, "Artist" tags, or GPS coordinates that might be part of a multi-part challenge. tango part3mp4