An issue with mp4 decryption

[CrymanChen]

(the video URL goes first)
The video doesn't need premium accounts, maybe it is geo-restricted (Australia).
https://7plus.com.au/hey-hey-its-100-years?episode-id=AMSP13-001

I got the key from ①pssh value and ②request URL.
And while in the decryption process, the decrypted file is 0 kb...


[Attachment 64535 - Click to enlarge]

(maybe spreading key value is not allowed here, but I'm sure the key I got is right)

the screenshot below is the media information of the encrypted video (.mp4 file), I made some translations about the Chinese characters if they're too hard for you to understand.


[Attachment 64536 - Click to enlarge]

Any suggestion or advice is highly appreciated.

[CrymanChen]

(crying) I just learned this knowledge from a friend on this forum.
But when I tried by myself, failure and failure over and over again.
Seems that I didn't learn how to "举一反三", a phrase in Chinese meaning that when a teacher taught(举) you one(一) key point, you can try to solve(反) "3(三) questions" related to it. (lol)

[ElCap]

did you get this as the kid:key?

abfe6f3dd737411397bafd404259e2e4:9803251db18b264d7cc30c798259485b

[CrymanChen]

did you get this as the kid:key?

abfe6f3dd737411397bafd404259e2e4:9803251db18b264d7cc30c798259485b

Let me check it again, I just closed all the pages and had my dinner.

-----

Here I am.
It seems that these two kid:keys are identical

abfe6f3dd737411397bafd404259e2e4:9803251db18b264d7cc30c798259485b

[CrymanChen]

did you get this as the kid:key?

abfe6f3dd737411397bafd404259e2e4:9803251db18b264d7cc30c798259485b

I also noticed that in the code below, there are two "pssh"s:

<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediaPresentationDuration="PT1H23M13.400S" minBufferTime="PT2.000S">
  <BaseURL>https://7plus-sevennetwork.akamaized.net/media/v1/dash/live/cenc/5303576322001/5ac8c33f-e712-4e34-a0fe-dffb1875b81b/abfe6f3d-d737-4113-97ba-fd404259e2e4/</BaseURL>
  <Period>
    <AdaptationSet mimeType="audio/mp4" startWithSAP="1" segmentAlignment="true" lang="en">
      <ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" xmlns:cenc="urn:mpeg:cenc:2013" cenc:default_KID="abfe6f3d-d737-4113-97ba-fd404259e2e4" value="cenc"></ContentProtection>
      <ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed" xmlns:cenc="urn:mpeg:cenc:2013" bc:licenseAcquisitionUrl="https://manifest.prod.boltdns.net/license/v1/cenc/widevine/5303576322001/5ac8c33f-e712-4e34-a0fe-dffb1875b81b/abfe6f3d-d737-4113-97ba-fd404259e2e4?fastly_token=NjI2N2YyYmJfMTMwYWE2ZDk0NWJhYjYzMzRmYzI1ZjExZTBhMWFiZjg2YjU1MDA5ZWM2ZTE5NDk1NzkyZGMyYjY2ZGQ1YzU0Mg%3D%3D" xmlns:bc="urn:brightcove:2015">
        <cenc:pssh>AAAAVnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADYIARIQq/5vPdc3QROXuv1AQlni5BoNd2lkZXZpbmVfdGVzdCIIMTIzNDU2NzgyB2RlZmF1bHQ=</cenc:pssh>
      </ContentProtection>
      <ContentProtection schemeIdUri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95" xmlns:cenc="urn:mpeg:cenc:2013" xmlns:mspr="urn:microsoft:playready">
        <mspr:pro>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</mspr:pro>
        <cenc:pssh>AAAEWnBzc2gAAAAAmgTweZhAQoarkuZb4IhflQAABDo6BAAAAQABADAEPABXAFIATQBIAEUAQQBEAEUAUgAgAHgAbQBsAG4AcwA9ACIAaAB0AHQAcAA6AC8ALwBzAGMAaABlAG0AYQBzAC4AbQBpAGMAcgBvAHMAbwBmAHQALgBjAG8AbQAvAEQAUgBNAC8AMgAwADAANwAvADAAMwAvAFAAbABhAHkAUgBlAGEAZAB5AEgAZQBhAGQAZQByACIAIAB2AGUAcgBzAGkAbwBuAD0AIgA0AC4AMAAuADAALgAwACIAPgA8AEQAQQBUAEEAPgA8AFAAUgBPAFQARQBDAFQASQBOAEYATwA+ADwASwBFAFkATABFAE4APgAxADYAPAAvAEsARQBZAEwARQBOAD4APABBAEwARwBJAEQAPgBBAEUAUwBDAFQAUgA8AC8AQQBMAEcASQBEAD4APAAvAFAAUgBPAFQARQBDAFQASQBOAEYATwA+ADwASwBJAEQAPgBQAFcALwArAHEAegBmAFgARQAwAEcAWAB1AHYAMQBBAFEAbABuAGkANQBBAD0APQA8AC8ASwBJAEQAPgA8AEMASABFAEMASwBTAFUATQA+AHcAbABoAHAAVwBrAFEAeABHAFIASQA9ADwALwBDAEgARQBDAEsAUwBVAE0APgA8AEwAQQBfAFUAUgBMAD4AaAB0AHQAcABzADoALwAvAG0AYQBuAGkAZgBlAHMAdAAuAHAAcgBvAGQALgBiAG8AbAB0AGQAbgBzAC4AbgBlAHQALwBsAGkAYwBlAG4AcwBlAC8AdgAxAC8AYwBlAG4AYwAvAHAAbABhAHkAcgBlAGEAZAB5AC8ANQAzADAAMwA1ADcANgAzADIAMgAwADAAMQAvADUAYQBjADgAYwAzADMAZgAtAGUANwAxADIALQA0AGUAMwA0AC0AYQAwAGYAZQAtAGQAZgBmAGIAMQA4ADcANQBiADgAMQBiAC8AYQBiAGYAZQA2AGYAMwBkAC0AZAA3ADMANwAtADQAMQAxADMALQA5ADcAYgBhAC0AZgBkADQAMAA0ADIANQA5AGUAMgBlADQAPwBmAGEAcwB0AGwAeQBfAHQAbwBrAGUAbgA9AE4AagBJADIATgAyAFkAeQBZAG0ASgBmAE4AMgBRAHcATgBXAFkANQBOAG0ARgBrAE0ARABnAHcATwBHAEUAdwBPAFQAQgBpAFoAVABSAGwATQBUAEUAMgBaAEcARQA0AFoARABrADUATQBUAGsAdwBaAEQAUQA1AE4AagBNADEATgBqAGMAegBNAFQAUgBtAE4AagBWAGoAWgBEAFkAeQBOAEQAUgBoAFoAagBnADEATQBEAGsAeQBNAG0ARQB5AFkAUQAlADMARAAlADMARAA8AC8ATABBAF8AVQBSAEwAPgA8AC8ARABBAFQAQQA+ADwALwBXAFIATQBIAEUAQQBEAEUAUgA+AA==</cenc:pssh>
      </ContentProtection>

hmmm... how to decode the latter "pssh" value, base64 the same?

[ElCap]

You only need the first one with urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed

[CrymanChen]

You only need the first one with urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed

OK, I get it. And it is strange that the situation reappeared.
The decrypted video file size is 0 kb.

[lomero]

you have used this code?

mp4decrypt --key xxx:xxx v.mp4 v_dec.mp4

[CrymanChen]

you have used this code?

mp4decrypt --key abfe6f3dd737411397bafd404259e2e4:9803251db18b264d7cc30c798259485b v.mp4 v_dec.mp4

What I typed in actually was a bit different. It was

mp4decrypt.exe --key...

because this is an exe file, so there is ".exe" in the code, but maybe the answer to your question is yes.

[lomero]

with .exe or without same thing
and key is correct

put ffmpeg on same folder with your video, then run

ffmpeg -i video.mp4 -c copy -ss 00:00:00.000 -t 00:00:01.000

this command cuts your video only the first minute
upload your video to some server and share the link

[lomero]

all work fine

probably you have used wrong command ...


[Attachment 64545 - Click to enlarge]

[CrymanChen]

with .exe or without same thing
and key is correct

put ffmpeg on same folder with your video, then run

ffmpeg -i video.mp4 -c copy -ss 00:00:00.000 -t 00:00:01.000

this command cuts your video only the first minute
upload your video to some server and share the link

OK, I recorded my steps and was trying to upload it to the server.
Here's a brief introduction
①The video decryption still failed, audio decryption seemed to be successful.
②The first one-minute cut was failed, either. (Was I using the wrong ffmpeg command...?)

the recording is here: https://streamable.com/gh57hu

Thank you for your help.

[ElCap]

try running this command on the encrypted file to check the kid

mp4dump --format json v.mp4 | findstr /I "default_KID"

[ElCap]

are you using yt-dlp with the mpd url from browser or using the 7plus extractor from yt-dlp?
ie.

yt-dlp --allow-u "mpd-url"

or

yt-dlp --allow-u "https://7plus.com.au/hey-hey-its-100-years?episode-id=AMSP13-001"

(i suspect you are using this one)

theres a long explanation (which i can send you if you plan on grabbing lots of episodes), but the basic idea is that in the second one the yt-dlp 7plus extractor doesnt pick the video/audio that matches the pssh from the browser.

easiest fix is to copy the mpd url from browser and use that with yt-dlp.

also if you login with a free account you will get 720p instead of 504p.

[CrymanChen]

To all my friends,

It worked!!!! (so excited)

I tried again and found that it worked.

Thank you!!!!

And maybe if some new friends don't know how to decrypt it, or if maybe you want to try to decrypt it by yourself
here is what I have done.

https://streamable.com/scenc9

Thank you @Elcap and @lomero

(crying...)

[CrymanChen]

are you using yt-dlp with the mpd url from browser or using the 7plus extractor from yt-dlp?
ie.

yt-dlp --allow-u "mpd-url"

or

yt-dlp --allow-u "https://7plus.com.au/hey-hey-its-100-years?episode-id=AMSP13-001"

(i suspect you are using this one)

theres a long explanation (which i can send you if you plan on grabbing lots of episodes), but the basic idea is that in the second one the yt-dlp 7plus extractor doesnt pick the video/audio that matches the pssh from the browser.

easiest fix is to copy the mpd url from browser and use that with yt-dlp.

also if you login with a free account you will get 720p instead of 504p.

It's my bad.
I didn't realize that I typed the website's URL , but actually, I should type the mpd file's URL.
My bad, my bad.

And as for

which i can send you if you plan on grabbing lots of episodes

I would really appreciate it. (but I'm afarid to trouble you, will it cost you much time to do this?). (thank you).

[ElCap]

It's my bad.
I didn't realize that I typed the website's URL , but actually, I should type the mpd file's URL.
My bad, my bad.

the extractors in yt-dlp can be really helpful for batch downloading, but if it doesnt work as expected going back to the mpd url from browser can be a good troubleshooting step

And as for

which i can send you if you plan on grabbing lots of episodes

I would really appreciate it. (but I'm afarid to trouble you, will it cost you much time to do this?). (thank you).

PM sent