Help with Mech-Plus

[Halomadman2]

Hi I think I might have made progress with downloading Robot Wars from Mech-Plus as I think can download the full audio and video (originally it is an .mpd file but it will not download anything but an advert. After a few more steps I seem to be able to download a M3U8 link in M3U8DL and it comes in at around 700mb.) but I am having an error when entering the license URL in to WKS-KEYS.

Original URL:

https://watch.mech-plus.com/player/24892/stream

The .mpd can be found at the above link, however I think it might be time sensitive or something.

I use the PSSH and the License URL from the .mpd in WKS-KEYS but I get this error.

PS C:\Users\Admin\Desktop\WKS-KEYS> py l3.py

PSSH: AAAAVnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADYIARIQLYjgCrdWT7OVZMe+Yvl81xoNd2lkZXZpbmVfdGVzdCIIMTIzNDU2NzgyB2RlZmF1bHQ=
License URL: https://manifest.prod.boltdns.net/license/v1/cenc/widevine/6277710345001/71ac9e1f-2ba7-4c3c-9eb0-2b8cda485ac4/2d88e00a-b756-4fb3-9564-c7be62f97cd7
Traceback (most recent call last):
  File "C:\Users\Admin\Desktop\WKS-KEYS\l3.py", line 25, in <module>
    correct, keys = WV_Function(pssh, lic_url)
  File "C:\Users\Admin\Desktop\WKS-KEYS\l3.py", line 21, in WV_Function
    wvdecrypt.update_license(license_b64)
  File "C:\Users\Admin\Desktop\WKS-KEYS\pywidevine\L3\decrypt\wvdecryptcustom.py", line 58, in update_license
    self.cdm.provide_license(self.session, license_b64)
  File "C:\Users\Admin\Desktop\WKS-KEYS\pywidevine\L3\cdm\cdm.py", line 275, in provide_license
    session.session_key = oaep_cipher.decrypt(license.SessionKey)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python310\lib\site-packages\Cryptodome\Cipher\PKCS1_OAEP.py", line 167, in decrypt
    raise ValueError("Ciphertext with incorrect length.")
ValueError: Ciphertext with incorrect length.

If anyone smarter than me could tell me where I might be going wrong or why it will not work for me please point me in the right direction. Thank you.

[BeLive]

Looks like your license url isn't complete and trimmed. Try pasting it fully and it should work. This is the result I got:

--key 2d88e00ab7564fb39564c7be62f97cd7:5e8695cabb14d09422f9b27ce77ed679

[Halomadman2]

Thank you very much for that, I'll try decrypting it soon! I guess my CDM might not be working as I get multiple error come up in WKS-KEYS when I use the full URL. I'll keep trying.

[Halomadman2]

It seems I wasn't able to download the video properly, is there a recommended way to do it? I've tried yt-dlp --allow-u and also used M3U8DL but I'm either getting a short 10 minute video or in M3U8DL an "Invalid URi" error.

[[ss]vegeta]

is there a recommended way to do it?

I'm not sure why would you be getting a 10 minute video with yt-dlp.
Is your yt-dlp updated?
Maybe you are feeding it a wrong mpd?
Get The Stream Detector add-on for Firefox to get the following command

ytdlp --allow-u --no-part --restrict-filenames --user-agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0" --referer "https://watch.mech-plus.com/" "https://manifest.prod.boltdns.net/manifest/v1/dash/live-baseurl/bccenc/6277710345001/71ac9e1f-2ba7-4c3c-9eb0-2b8cda485ac4/6s/manifest.mpd?fastly_token=NjJjODdlZTZfYjU1NDJlYjYwNTFjNGRkZTYwMjVjMThkMzZkMGQxMTNkYmI4YjA5ODdkOTE5ZGE4ZWYxYmU0ZWM0MWI0NDVmZg%3D%3D"

This downloads the full ~700mb episode and it can be decrypted just fine with the key above from Jason Sudeikis.

Here's your first episode
https://we.tl/t-WS3oNscyJZ

[Halomadman2]

Thank you very much for your help! Your command seems to work fine but I was using The Stream Detector and yt-dlp (latest update) and I was only getting a one minute advert, then I noticed that I'm picking up a URL for "content.mpd" but not "manifest.mpd" like in your post and I can't seem to find it. Is yours coming up with The Stream Detector plugin? I appreciate your helping me thank you.

[[ss]vegeta]

Is yours coming up with The Stream Detector plugin? I appreciate your helping me thank you.

Try installing ublock origin. Does the video actually start playing in your browser?
The proper mpd comes up in both developer tools -> network and The Stream Detector add-on.

[Attachment 65813 - Click to enlarge]
I can't seem to find content.mpd

[Halomadman2]

That's it! I started getting 'manifest.mpd' instead of 'content.mpd' after that. Legend

Now to decrypt...

[helpmeplease11]

Hi All, I am a bit late to this. I am stuck at the moment. I followed the steps above and used the https://manifest.prod.boltdns.net/manifest/v1/dash/live-baseu.......... link but it does not download anything. It comes up with an error saying its DRM protected or something. Any help/tips would be useful. I am new to this. Regards,

[Karn]

Hi All, I am a bit late to this. I am stuck at the moment. I followed the steps above and used the https://manifest.prod.boltdns.net/manifest/v1/dash/live-baseu.......... link but it does not download anything. It comes up with an error saying its DRM protected or something. Any help/tips would be useful. I am new to this. Regards,

The full url includes the token attached at the end.

Use n_m3u8dl

n_m3u8DL-RE "https://manifest.prod.boltdns.net/manifest/v1/dash...."

[Filippo]

Hello, is it possible to download the video and audio in a single file? I get two files instead and is a bit tricky to decrypt and merge them.

[lomero]

yes, use N_m3u8DL-RE -M format=mkv "mpd_link"
or -M format=mp4

anyway it's easy merge audio/video with ffmpeg
ffmpeg.exe -i video.mp4 -i audio.m4a -c copy final_video.mp4

[Filippo]

yes, use N_m3u8DL-RE -M format=mkv "mpd_link"
or -M format=mp4

anyway it's easy merge audio/video with ffmpeg
ffmpeg.exe -i video.mp4 -i audio.m4a -c copy final_video.mp4

thank you, I've tried with N_m3u8DL-RE but I get this warnings.


[Attachment 70974 - Click to enlarge]
The result mkv is only 700kb and it does not play. The url is right but I don't understand if it has to do with DRM. Do I need to specify the key somewhere?

[pram0dm]

This is how your command should look like -

.\N_m3u8DL-RE.exe "Complete MPD URL" --save-name _TEST --key 2d88e00ab7564fb39564c7be62f97cd7:5e8695cabb14d09422f9b27ce77ed679 -mt -M mp4 -sv best -sa best -ss lang="eng":for=all

[Filippo]

This is how your command should look like -

.\N_m3u8DL-RE.exe "<Complete MPD URL>" --save-name _TEST --key 2d88e00ab7564fb39564c7be62f97cd7:5e8695cabb14d09422f9b27ce77ed679 -mt -M mp4 -sv best -sa best -ss lang="eng":for=all

Thank you very much. I'll try that. However I have a problem, I tried with the first video of the first series and no problem. However with the second video I cannot decypt it using the key up in this thread. Does the key changes for every video? What's the most updated way to get the key, I've found many guides but all outdated...

[pram0dm]

Yes, they do change with each and every video for this service, but not necessarily that's the case for all those that are out there.
Some services even rotate keys for individual videos wherein the same key wouldn't work a second time after a period of time.

Use https://cdrm-project.com/ to get them. That's the easiest way.

[Filippo]

Yes, they do change with each and every video for this service, but not necessarily that's the case for all those that are out there.
Some services even rotate keys for individual videos wherein the same key wouldn't work a second time after a period of time.

Use https://cdrm-project.com/ to get them. That's the easiest way.

Thank you very much. i tried with your command and it does work for the first episode, but not for the others. I guess the key is different. Is there a guide on how to get the PSSH, License and Headers? I'm using The Stream Detector and it gives some header but I'm not sure it's what I need.
I don't want to hijack the thread so if you want you can DM me, but it could be useful for others like me with low experience.
Thank you

[pram0dm]

I will definitely give you hints to get started and after that it's all you.

License URL and its headers will change with each service, and this is obtained easily by pulling up your Developer Tools and searching to POST requests like auth, widevine, lic, license etc. In this case it was widevine.

Next, fetch the PSSH using the EME PSSH Extractor script with Tampermonkey. You can search for it here on the forums.

Finally, use the cdrm-project to recreate the request with the given PSSH and URL that you obtained from the first step and you receive the keys. You don't need to add anything else here.

[Filippo]

I will definitely give you hints to get started and after that it's all you.

License URL and its headers will change with each service, and this is obtained easily by pulling up your Developer Tools and searching to POST requests like auth, widevine, lic, license etc. In this case it was widevine.

Next, fetch the PSSH using the EME PSSH Extractor script with Tampermonkey. You can search for it here on the forums.

Finally, use the cdrm-project to recreate the request with the given PSSH and URL that you obtained from the first step and you receive the keys. You don't need to add anything else here.

Hi, thanks to your help and some research I've been able to proceed, however I'm stuck on ONE video that for some reason returns 5 keys in the CDRM website. I've tried all of them singularly and together with multiple --key command in the script, like in the N_m3u8DL-RE documentation. But still the file cannot decrypt it. Do you have any suggestion?
Thank you

[lomero]

try with shaka

[Filippo]

try with shaka

I tried with mp4decrypt but it does not work. Shaka is far too complicated for my abilities.

This is the cmd I'm using:

N_m3u8DL-RE "https://manifest.prod.boltdns.net/manifest/v1/dash/live-baseurl/bccenc/6277710345001/b93ab009-7e9d-425a-b8d0-ed1ace1134df/6s/manifest.mpd?fastly_token=NjQ2YjliYTFfM2U1MGQ3OTdkOWViN2YzNWRhMTQ0Mjg1NzAzZDY1ZDc4MjNlMTM1YzdkYmI5NTlhOGQxMDJlNjYxYWRlMjExNw%3D%3D" --save-name Episode --key f326cd30c0f75519a010813942e54f23:553066d951be2e47bac6bf3dd14a6999 --key ccb1cb1e0be6575bb64bd354e4d3645f:1ff913a4607b61c1c003610960b5cba1 --key a5d79a4aafae5d6a902936b938fae514:7b2cea0375631051a710c71348cf2939 --key db6919bfdf085b8c8c039fce9a9e9269:460bb4400576552a8fc8cfb3dbef88aa --key 56632709aa855909b52d1428489554cc:8c64eba03d84ac1a44c602ec291b836d -mt -M mp4 -sv best -sa best -ss lang="eng":for=all 

But I only get an encrypted file and warnings.


[Attachment 71204 - Click to enlarge]

[stabbedbybrick]

@Filippo:

Try this one:

4ccfbdcfc1b942129a62db558141554e:e0aa5d97850beb21c62cbba82e86599d

[Filippo]

@Filippo:

Try this one:

4ccfbdcfc1b942129a62db558141554e:e0aa5d97850beb21c62cbba82e86599d

It worked. Thank you very much. May I ask how did you get only one? that CDRM website always returned 5.

[stabbedbybrick]

If you look at the result on CDRM, it says "Cached PSSH: Time:Tue Nov 29 14:05:55 2022". CDRM caches PSSH from past requests, so if someone already did it once, you'd get the same keys. In this case, the cached keys are either old or wrong so they won't work.

I used my own CDM with the license and PSSH found inside the mpd, which gave me a working key.