To extract video for every participant, we first grouped the RTP packets by the SSRC (Synchronization Supply Identifier) worth in the RTP header. Every SSRC worth signifies a single participant. For every SSRC, we reassembled fragmented H264 NALUs in the right order utilizing RTP timestamps and sequence numbers, then decrypted them with the AES-128 key in ECB mode, then de-padded the decrypted consequence (utilizing the 4-byte size worth), and lastly wrote the decrypted knowledge to disk in a uncooked H.264 stream file. We had been in a position to play the file utilizing the following VLC media player command: