What real pssh is?

[paep03]

Thanks all

[Karoolus]

AAAARnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAACYIARIQBy7rAvZ0T4OPzI8O82sxLhoJY29yZXRydXN0IgMxMDk4AA==

This is the right PSSH

[ElCap]

I found two pssh but both unable to parse license - check protobufs

https://ubn-streamer2.cdn.3bbtv.com:8443/3bb/live/109/109.mpd

AAAARnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAACYIARIQBy 7rAvZ0T4OPzI8O82sxLhoJY29yZXRydXN0IgMxMDk4AA==

AAAAdHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAUHLusC9n RPg4/Mjw7zazEuBy7rAvZ0T4OPzI8O82sxLgcu6wL2dE+Dj8yPDvNrM S4HLusC9nRPg4/Mjw7zazEuST4f3B/6QeOSYXBK/yA4awAAAAA=

put both into here and look at the "System ID" - the right one will say Widevine"

[Obo]

... or simply find the pattern "7e+" in the (first 20 chars of) PSSH, which is always present in a widevine PSSH. Or if you can better remember: a widevine PSSH always starts with "AAAARnBz". Or if you look at the mpd, the "urn:uid:" field for widevine begins with "ede" (lower or upper case).

[Karoolus]

... or simply find the pattern "7e+" in the (first 20 chars of) PSSH, which is always present in a widevine PSSH. Or if you can better remember: a widevine PSSH always starts with "AAAARnBz". Or if you look at the mpd, the "urn:uid:" field for widevine begins with "ede" (lower or upper case).

Not always the case though, I've had some weird PSSHs. I usually get the PSSH from the init file, that way you are always sure.

[Obo]

Yes, you are right; I should've written "usually" instead of "always". Other than that, if you find "7e+" in the PSSH or if the PSSH starts with "AAAARnBz", you can be sure to have a widevine PSSH.

[ElCap]

Yes, you are right; I should've written "usually" instead of "always". Other than that, if you find "7e+" in the PSSH or if the PSSH starts with "AAAARnBz", you can be sure to have a widevine PSSH.

The first part of a widevine pssh box is the size in hex padded out to 4 bytes, so unless the size of your box is always 70 bytes (00000046) it won't start with AAAARnBz, the Rn part will change depending on the size of the box.
Id be looking for the "7e+" to determine if it was widevine pssh box at a glance.

[Karoolus]

If you find a PSSH in the CENC tags that contain

EDEF8BA9....

that is the Widevine PSSH.
Other than that, I just use my own PSSHBox tool to check if I have the right PSSH

[Attachment 73775 - Click to enlarge]

And getting the PSSH from init file is always the most certain way.

[paep03]

Thanks

[lomero]

072eeb02f6744f838fcc8f0ef36b312e:b797c12f2dd64728aae23fd3c8ef275c

[paep03]

072eeb02f6744f838fcc8f0ef36b312e:b797c12f2dd64728aae23fd3c8ef275c

I’m so grateful for your help.