get_moov_pssh.py

import base64
import uuid

from pymp4.parser import Box


def get_moov_pssh(fd):
    while True:
        x = Box.parse_stream(fd)
        if x.type == b'moov':
            for y in x.children:
                if y.type == b'pssh' and y.system_ID == uuid.UUID('edef8ba9-79d6-4ace-a3c8-27dcd51d21ed'):
                    return base64.b64encode(y.init_data)