I have 2 fragment files from a stream. I can decrypt 3.m4s but 4.m4s is not. 

`cat audio.m4s > t.mp4 && cat 4.m4s >> t.mp4 && mp4decrypt --key 2:7648d1bde1c3fcf0116fd8a13b3d09a0 t.mp4 x.mp4`

I see that, 4.m4s has www.nielsen.com:id3:v1 before 
![image](https://user-images.githubusercontent.com/10054833/162564285-82f67acd-f6eb-4480-88e2-ca83365683e0.png)
 and 3.m4s is not. 4.m4s is a metadata and watermark by Nielsen
 
 
![image](https://user-images.githubusercontent.com/10054833/162564326-9e5cb445-7365-4a67-b2b8-de7af15457d6.png)

audio.m4s (init audio container) + 3.m4s + 4.m4s , you can find here: [](https://drive.google.com/file/d/1JMuq55iOcN4kYczKhKwAGT3OMDSYFegi/view?usp=sharing)
https://drive.google.com/file/d/1JMuq55iOcN4kYczKhKwAGT3OMDSYFegi/view?usp=sharing

[MP4Decrypt] Cannot decrypt with www.nielsen.com:id3:v1
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : [MP4Decrypt] Cannot decrypt with www.nielsen.com:id3:v1
Issue date:

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I have 2 fragment files from a stream. I can decrypt 3.m4s but 4.m4s is not. 

`cat audio.m4s > t.mp4 && cat 4.m4s >> t.mp4 && mp4decrypt --key 2:7648d1bde1c3fcf0116fd8a13b3d09a0 t.mp4 x.mp4`

I see that, 4.m4s has www.nielsen.com:id3:v1 before 
![image](https://user-images.githubusercontent.com/10054833/162564285-82f67acd-f6eb-4480-88e2-ca83365683e0.png)
 and 3.m4s is not. 4.m4s is a metadata and watermark by Nielsen
 
 
![image](https://user-images.githubusercontent.com/10054833/162564326-9e5cb445-7365-4a67-b2b8-de7af15457d6.png)

audio.m4s (init audio container) + 3.m4s + 4.m4s , you can find here: [](https://drive.google.com/file/d/1JMuq55iOcN4kYczKhKwAGT3OMDSYFegi/view?usp=sharing)
https://drive.google.com/file/d/1JMuq55iOcN4kYczKhKwAGT3OMDSYFegi/view?usp=sharing

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