mirror of
https://cdm-project.com/Download-Tools/udemy-downloader.git
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0719800145
+ extract_kid method will raise an error if the file does not exist + If KID extraction fails, the lecture will be skipped instead of causing the program to exit
35 lines
861 B
Python
35 lines
861 B
Python
import mp4parse
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import codecs
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import widevine_pssh_pb2
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import base64
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import os
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def extract_kid(mp4_file):
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"""
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Parameters
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----------
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mp4_file : str
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MP4 file with a PSSH header
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Returns
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-------
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String
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"""
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boxes = mp4parse.F4VParser.parse(filename=mp4_file)
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if not os.path.exists(mp4_file):
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raise Exception("File does not exist")
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for box in boxes:
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if box.header.box_type == 'moov':
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pssh_box = next(x for x in box.pssh if x.system_id == "edef8ba979d64acea3c827dcd51d21ed")
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hex = codecs.decode(pssh_box.payload, "hex")
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pssh = widevine_pssh_pb2.WidevinePsshData()
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pssh.ParseFromString(hex)
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content_id = base64.b16encode(pssh.content_id)
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return content_id.decode("utf-8")
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# No Moof or PSSH header found
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return None |