#9567: libavformat doesn't correctly decrypt video with hls sample-aes
encryption
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Reporter: haruka | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
The most obvious bug is in the function `decrypt_video_frame` in
`libavformat/hls_sample_encryption.c`.
If encrypted NALU length is greater than decrypted, it means there were
scep bytes removed so we need to move back the following NALUs. However,
the `memmove` currently moves nothing and after shrinking the packet at
the end, the last few bytes will get truncated and the resulting video
stream will not be correctly decoded.
How to reproduce:
Trying to play some SAMPLE-AES encrypted TS streams using ffplay should be
the easiest way to test it.
Apple has a test stream but it's walled behind Apple ID login (any Apple
ID should be fine):
https://developer.apple.com/services-
account/download?path=/Developer_Tools/FairPlay_Streaming_Test_Streams/FairPlay_Streaming_Test_Content_v1.0.zip
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Ticket URL: <https://trac.ffmpeg.org/ticket/9567>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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