Decrypting ts files from m3u8

[No_Miaus]

Hello! I'm trying to decrypt a m3u8 that contains a lot ts files. The key (m3u8 files says it's AES 128) is on a php and the content looks like this and there isn't IV (so..?):



The content of that php page change each time I refresh it so i imagine it uses some clock to encrypt it but... What kind of key is it? Should I use wget to get that key to a txt file and then use openssl to decrypt it? Would It be enough to decrypt it or how can I do it?

Thank you