Can't decrypt audio from mtv.fi

[ajd]

Hi all,

A little new at this, so just need a little help pointing me in the right direction.

I'm trying to download a few episodes of Grand Design's Finland for example: https://www.mtv.fi/video/0283d75c6a72578e6642/jakso-2-ylellisyytta-lempaalassa - access to the website/stream is free via a free login.

I've been able to figure out the url for the .m3u8 which is here https://vod.streaming.a2d.tv/f44ced16-5636-46a7-ba74-aa1f3a58f436/df41d8a0-7744-11ee-8...?start_index=3

And if I use yt-dlp on that url with --allow-unplayable-formats I get what appears to be a video mp4 and audio mp4

I've obtained the decryption key, which does work on the video file using mp4decrypt --key <key> vid.mp4 vid-d.mp4 , however when I try to do the same on the audio mp4, it doesn't do any processing, spits out a new audio file, but when I play it, there's no sound at all.

Any ideas what i'm doing wrong? does the audio file somehow have a different decryption key? or is yt-dlp downloading/creating the audio file incorrectly?

Any help is appreciated, thanks!

[lomero]

not tested, but i think 1 key for video and 1 for audio

if your streaming service it's free, share here login data

also share pssh and your key found (with l3.py ? or ... ? )

[ajd]

Hi, appreciate your reply, I was thinking maybe there might be another key, but couldn't find one from the EME data, i'm guessing it might show up elsewhere.

You're welcome to login and have a look to see if you can figure it out for me, user account is

l: altanderson@gmail.com
p: V3%r%3Ei3qQR&tS

Website is in Finnish, but you should be able to figure it out without google translate.

I got the PSSH from here

[EME] MediaKeySession::generateRequest
    Session ID: (not available)
    Init Data Type: cenc
    Init Data: AAAAdXBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAFUSEJmQomaA+T4JpVq/NacNgGUaCGNhc3RsYWJzIihleUpoYzNObGRFbGtJam9pZEhadFpXUnBZUzB5TURNeE9EVTJOeUo5MgdkZWZhdWx0SPPGiZsG

Key I got was

SUCCESS
KID: 9990a26680f93e09a55abf35a70d8065

License URL: https://lic46.drmtoday.com/license-proxy-widevine/cenc/?specConform=true&assetId=tvmedia-20318567

Acquired At: 1/15/2024, 8:58:38 AM

9990a26680f93e09a55abf35a70d8065:d8c905107605f0fd3d81aa71502c02d6

Hopefully that's all for the right video, I was changing between a few trying different things.

Thanks for your help!

[jckzz]

try using N_m3u8DL-RE & m3u8 edit to mpd

N_m3u8DL-RE -M format=mp4 --key 9990a26680f93e09a55abf35a70d8065:d8c905107605f0fd3d81aa71502c02d6 "https://vod.streaming.a2d.tv/f44ced16-5636-46a7-ba74-aa1f3a58f436/df41d8a0-7744-11ee-8015-01dadb48e460_20318567.ism/.mpd" --save-name video

[stabbedbybrick]

You have the correct key, but you need to use shaka-packager instead of mp4decrypt:

packager --enable_raw_key_decryption --keys key_id=9990a26680f93e09a55abf35a70d8065:key=d8c905107605f0fd3d81aa71502c02d6 stream=video,in=video_enc.mp4,output=video_dec.mp4

Combine it with N_m3u8DL-RE for a much smoother process:

N_m3u8DL-RE --key 9990a26680f93e09a55abf35a70d8065:d8c905107605f0fd3d81aa71502c02d6 "https://vod.streaming.a2d.tv/f44ced16-5636-46a7-ba74-aa1f3a58f436/df41d8a0-7744-11ee-8015-01dadb48e460_20318567.ism/.m3u8?start_index=3" --use-shaka-packager

[ajd]

Awesome, thanks jckzz and stabbedbybrick! Got it all working now Appreciate your help.

[Sviests]

I've obtained the decryption key, which does work on the video file using mp4decrypt --key <key> vid.mp4 vid-d.mp4 , however when I try to do the same on the audio mp4, it doesn't do any processing, spits out a new audio file, but when I play it, there's no sound at all.

It works for mp4decrypt if you do --key TRACKID:KEY instead of KID:KEY. I extracted the audio, checked with mediainfo,that trackID for audio is 1 (i've seen sometimes it being 2 or 4).
Input:

mp4decrypt --key 1:d8c905107605f0fd3d81aa71502c02d6 audio.m4a audio_decr.m4a

And it plays the audio just fine.

[ajd]

Thanks Sviests, I didn't know you could do that with mp4decrypt.

[marktwain]

Hi everyone, I have a similar problem but with AMZN, the video is all ok but the audio is not working, can anyone give me a suggestion? Thanks