net/threads/pishem-ctf-writeup-pravil-no-zachem-eto-nuzhno-i-kak-pomogayet-razvitiyu.92117/">Codeby ?
Use file 3137.mp4 to confirm it is actually an MP4 and not a renamed archive or polyglot file. 3137.mp4
If you found something in a single frame, explain how you extracted it using ffmpeg -i 3137.mp4 -vf "select=eq(n\,3137)" -vframes 1 out.png . 3137.mp4
Did you run exiftool 3137.mp4 ? Often, flags or hints are hidden in the "Comment" or "Artist" tags. 3137.mp4
Did you find the flag by running strings 3137.mp4 | grep "CTF{" ? 4. Final Flag Flag: FLAGexample_flag_123