Qrpff Short and Fast Code

Short: #!/usr/bin/perl # 472-byte qrpff, Keith Winstein and Marc Horowitz # MPEG 2 PS VOB file -> descrambled output on stdout. # usage: perl -k1>-k2>-k3>-k4>-k5> encrypted output # where k1..k5 are the title key bytes in least to most-significant order Fast: #!/usr/bin/perl -w # 531-byte qrpff-fast, Keith Winstein and Marc Horowitz # MPEG 2 PS VOB file on stdin -> descrambled output on stdout # arguments: title key bytes in least to most-significant order The fast version is actually fast enough to decode a movie in real-time.

A screenshot compares the short and fast Perl implementations of qrpff, a tool for descrambling MPEG-2 video. The joke is the understated claim that the optimized version is finally fast enough to decode a movie in real time, while the dense code makes the technical achievement look absurdly cryptic.

• @dev_meme / 7782 2026-03-03