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[HLS] Fix decryption issues (#1117)

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* Unpad HLS fragments with PKCS#7 according to datatracker.ietf.org/doc/html/rfc8216
* media_sequence should only be incremented in for media fragments
* The native decryption should only be used if ffmpeg is unavailable since it is significantly slower. Closes #1086

Authored by: shirt-dev, pukkandan
This commit is contained in:
shirt 2021-09-28 14:53:24 -04:00 • committed by GitHub
commit 7687c8ac6e
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2 changed files with 15 additions and 8 deletions
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3
yt_dlp/downloader/fragment.py
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@ -355,7 +355,8 @@ class FragmentFD(FileDownloader):
# not what it decrypts to.
if self.params.get('test', False):
return frag_content
return aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv)
decrypted_data = aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv)
return decrypted_data[:-decrypted_data[-1]]
return decrypt_fragment