We are given a video file in (.mkv) format, was it just a quick-heal advertisement or not???You can hear a beeping sound with audio running besides it. Also, you can see some partof QR flashing in between different frames of video.
Extract all these frames and layer it up, it will create a QR, that will get you to half of thesolution.
Now about the beeping sound, you can’t hear it properly as the ad running keeps blockinga few beats.
Also I assumed that it must be Morse code so I started filtering different frequencies andafter some guesses and observation, I got 500Hz as the correct frequency for that beepingaudio.
Lastly, decoding that audio using morse I got the final Flag.
```FLAG: VishwaCTF{S3cur1ty_S1mpl1f13d_5NJ0Y_C0UP0NS}```