tea_decrypt (func57 in WASM) uses the Tiny Encryption Algorithm (TEA) with 16 cycles and precomputed sums to encrypt a 64-bit block every 80 bytes of a NAL unit (type 1, 5 or 25).
The 128 bit key for each NAL unit starts at index 16 and the encrypted data at index 32.
cctv.py decrypts a single ts segment.
python cctv.py [infile] [outfile]- ts_decrypt.js (TS parser implementation and reference decrypter)