Likely a tag for the specific encoder or internal release group. 3. The Impact of HEVC on 2000s-Era Cinematography
This signifies that the file is a direct capture or download from a streaming service, preserving the original bitstream without the generational loss associated with re-encoding a disc. DDP5.1 (Dolby Digital Plus):
: This could potentially refer to the title of the movie or TV show ("Raaz"), the year it was released or produced ("2002"), and possibly a version or episode number ("1080"). "Raaz" is a known Bollywood horror film released in 2002.