Getting started
3 methods to find PSSH:1. Method
The simplest one: PSSH is clearly indicated in MPD file. Download MPD file (browser add-on "MPD Detector" will give you MPD link or filtering for mpd in the network tab of devoloper tools (ctrl + shift + c)), open it with Notepad, search for pssh value.
If there is KID, but no PSSH in MPD, calculate PSSH by using KID:
Using this website you can get the PSSH by entering in the
urn:uuid: into the System ID field and entering the cenc:default_KID= into the KEY IDs field without the quotes ""
EME Logger Script (installed on Tampermonkey add-on) will give you init data. That's your PSSH.
This can be found on Developer Tools (ctrl + shift + c) > Console, in the filter bar search for
MediaKeySession::generateRequest you will find Init Data.Optional, may be rquired:
If that Init Data is very very long, convert it to HEX: https://base64.guru/converter/decode/hex
Here's what mine looked like before conversion.
After Base64 > HEX conversion, you will find a Widevine-PSSH box, this can be found easily by searching with
ctrl + f and searching for 70737368PSSH header is always in a
000000xx70737368 where the xx is varied and can be from 1-9 in both x spots. You always want to copy the 6 0's before the xx as well.Example:
The end of the header is always then followed by 8 more 0s, if you see this, you are in the right place.
Once you find the header start at the beginning 0 from the header and copy until the end of the converted hex, it should look like this
Example:
In this case the full value was
000000577073736800000000edef8ba979d64acea3c827dcd51d21ed0000003708011210162f7d326cf24f6dbd1319bc572bbc151a0b62757964726d6b65796f732210162f7d326cf24f6dbd1319bc572bbc152a024844convert the hex back into base64 using https://base64.guru/converter/encode/hex
Example:
In this case we got the PSSH value of
AAAAV3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADcIARIQFi99MmzyT229Exm8Vyu8FRoLYnV5ZHJta2V5b3MiEBYvfTJs8k9tvRMZvFcrvBUqAkhECongrats, you have the PSSH!
4. Method
Using init files
You can use this tool to obtain the PSSH from an init file
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