Add Subject Here

Bug link:
https://w3c.github.io/encrypted-media/format-registry/initdata/cenc.html#clear-key

EXAMPLE 1

var pssh = [
    0x00, 0x00, 0x00, 0x4c, 0x70, 0x73, 0x73, 0x68, // BMFF box header
(76 bytes, 'pssh')
    0x01, 0x00, 0x00, 0x00,                         // Full box header
(version = 1, flags = 0)
    0x10, 0x77, 0xef, 0xec, 0xc0, 0xb2, 0x4d, 0x02, // SystemID
    0xac, 0xe3, 0x3c, 0x1e, 0x52, 0xe2, 0xfb, 0x4b,
    0x00, 0x00, 0x00, 0x02,                         // KID_count (2)
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, // First KID
("0123456789012345")
    0x38, 0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, // Second KID
("ABCDEFGHIJKLMNOP")
    0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
    0x00, 0x00, 0x00, 0x00,                         // Size of Data (0)
];


Total pssh bytes is 68 bytes while BMFF box header is 76 bytes.

It's wrong, I think it should be 0x44.



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