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evan-goode
Couldn't fetch DOLBY ATMOS track.
TIDAL has some new content with DOLBY ATMOS processed tracks. I tried to fetch that but always gets the LOSSLESS file.
Test URL - https://tidal.com/browse/track/125155092 OR Search for Blinding Lights and select the 3rd one.
Good catch, thanks for the report! Should be fixed in 3b321e1fbe78bce08a4247a8986e12df113c7b4d. TIDAL is full of these annoying edge cases unfortunately.
That means, we cant download the DOLBY ATMOS file? As I see, you are redirecting to LOSSLESS quality if DOBLY_ATMOS. Am I right?
Ah I totally misunderstood the issue. I'm having a little trouble getting the official client to stream/download a DOLBY_ATMOS track, but once I can see what the API call looks like, this shouldn't be hard to do.
Its only playable from Dolby supported device, my Android is. How can I "fiddler" my device?
I tried capturing the network, but instead of browser, it cannot capture any app traffic. It seems I need to download the TIDAL apk, decompile, make some changes that it accepts USER installed certificats into its build and compile. I dont think I can do all that.
If I get TIDAL modified apk, I can help with further traffic report to fetch DOLBY ATMOS stream.
Just got MQA support working, and I'd like to figure out Dolby audio as well. Still willing to help out?
Yes, you can patch the APK manually to disable cert pinning, but this Xposed module works great with TIDAL: https://github.com/ViRb3/TrustMeAlready. If you're on Android 9 or 10, you can use https://github.com/ElderDrivers/EdXposed instead of the original Xposed.
Either MITM it being weird or the Dolby Atmos tracks are tiny. Are you telling me that a track with 3d audio is <7MB ?. + I don't think there is a file format for Atmos is there?
Just got MQA support working, and I'd like to figure out Dolby audio as well. Still willing to help out?
Yes, you can patch the APK manually to disable cert pinning, but this Xposed module works great with TIDAL: https://github.com/ViRb3/TrustMeAlready. If you're on Android 9 or 10, you can use https://github.com/ElderDrivers/EdXposed instead of the original Xposed.
Oh yes.
It looks like the only difference in getting a Atmos track is "audioMode": "DOLBY_ATMOS" Which does result in a different flac file then without it
Track with DOLBY_ATMOS in the request is 16.3mb (But seems to just be an MQA file) Track without it is 16.5mb
@Dniel97 said:
"Tidal uses according to a German website https://www.heise.de/newsticker/meldung/3D-Musikformat-Dolby-aeussert-sich-zur-Zukunft-von-Dolby-Atmos-Music-4630101.html Dolby AC-4 which is a proprietary format from Dolby Laboratories. Even when you can download the Dolby AC-4 file, there is (currently) no way to playback these files, read more here: https://en.wikipedia.org/wiki/Dolby_AC-4. Here is an example ac-4 file: https://github.com/google/ExoPlayer/blob/release-v2/library/core/src/test/assets/ts/sample.ac4 where you can try playing this file."
What I think, the 16MB request could be the audio file without the AC-4 filter and it requests AC-4 filter file separately and process while streaming.
Will have to look into it. Currently when playing a Atmos track on mobile the request is for an mp4 file like this
"assetPresentation": "FULL",
"audioMode": "DOLBY_ATMOS",
"audioQuality": "LOW",
I see no option in the app to change the audio quality to anything else
So the mp4 from tidal seems to be a AC-4 file its just how to play it is the problem
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (mp42/isom)
File size : 6.53 MiB
Duration : 3 min 32 s
Overall bit rate : 257 kb/s
Encoded date :
Tagged date :
Audio
ID : 1
Format : AC-4
Format/Info : Audio Coding 4
Commercial name : Dolby AC-4
Format version : Version 2
Codec ID : ac-4
Duration : 3 min 32 s
Bit rate : 256 kb/s
Sampling rate : 48.0 kHz
Frame rate : 23.438 FPS (2048 SPF)
Compression mode : Lossy
Stream size : 6.50 MiB (100%)
Default : Yes
Alternate group : 2
Encoded date : UTC 2020-03-02 19:33:12
Tagged date : UTC 2020-03-02 19:33:12
I-Frame interval : 24 frames
Number of presentations : 1
Number of substreams : 1
Presentation #1 : Immersive Stereo Main (English)
Presentation ID : 0
Dolby Atmos : Yes
Dialogue normalization : -17.00
Language : English
Loudness : Yes
Integrated loudness (speech gated) : -26.0 LKFS
Integrated loudness (level gated) : -16.5 LKFS
Audio Loudness Standard : ATSC A/85
Realtime loudness corrected : No
Dialogue corrected : No
Dynamic Range Control : Yes
E-AC-3 DRC profile : Music light
Home theater AVR : Music light
Flat panel TV : Music light
Portable speakers : Music light
Portable headphones : Music light
Group #s : 1
Group #1 : Main
Content classifier : Main
Language : English
Channel coded : Yes
Immersive stereo : Dolby Atmos Content
Number of substreams : 1
Substream #s : 1
Substream #1 : Stereo
Channel mode : Stereo
Immersive stereo : Dolby Atmos Content
Channel layout : L R
I would like to see support for getting atmos files. I have been playing around and I can't seem to figure out how or why a "audioMode": "DOLBY_ATMOS" is returning for the stream. I just keep getting flac files
The request for atmos files to tidal is
https://api.tidal.com/v1/tracks/125155092/playbackinfopostpaywall?playbackmode=STREAM&assetpresentation=FULL&audioquality=HI_RES&streamingsessionid=xxx&playlistuuid=xxx&prefetch=false&countryCode=US
Response is
"assetPresentation": "FULL",
"audioMode": "DOLBY_ATMOS",
"audioQuality": "LOW",
"manifest": "xxx",
"manifestMimeType": "application/vnd.tidal.bts",
"streamingSessionId": "xxx",
"trackId": 125155092
}
The manifest for me at least always returns with a .flac and not the .mp4 file
I also suspect that files ending in 2101.mp4 are atmost files since every I have seen ending in that is an atmos file
Amazing find! If someone could teach me a little, I can spare time on this.
@112madgamer try HIGH instead of HIGH_RES that is, don't use HIGH_RES, just use HIGH
Thanks. But I have managed to to download them. I have rigged RedSea to pull them. You need the authorization header to be set. While still having audioquality as HI_RES. Suspect you also need to mimic the newer client as I have changed my header versions to 2.25.1 as well as User-Agent to TIDAL_ANDROID/992 okhttp/3.13.1. I don't see any support for any windows app to decode ac4 even ffmpeg has closed all the stuff with ac4
@112madgamer check this? https://github.com/google/ExoPlayer/pull/5303/files#diff-6ceea91e68efaca951f5ac10e33fd0df
I have seen that but its only for android. Which I can listen to the songs with Google Music app. Still no support for the Sony 3D audio MPEG-h mha1
Also according to ffmpeg irc thats
ExoPlayer only implements demuxing, decoding is handed off to some external decoder component, so alone those changes dont mean much
ffmpeg has a WIP for AC-4 it works but its a way off being implemented https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=451
The work is sponsored by VLC so maybe be the end of the year AC-4 decoding might be a thing
Does this help in anyway?
https://developer.dolby.com/forms/dolby-atmos-conversion-tool/
@112madgamer Mind sharing the payload that you used to fetch the Atmos MP4 file? It might still be worth adding support for it even if they can't be played back atm.
Can anyone explain to me how to download the Atmos or 360RA files or add support to the code? Thank you very much
I have seen that but its only for android. Which I can listen to the songs with Google Music app. Still no support for the Sony 3D audio MPEG-h mha1
@112madgamer wait a moment, I don't know if I misunderstood, can this file atmos be played on google play music or youtube music?
The atmos tracks can be played with Google music app. So I guess the Youtube music app would work also haven't tested. @joseph39 All you need is the "authorization" header set. Which you can get your code by using the MITM proxy. Currently I have found no easy way to download them.
It might be possible if we worked on the logging in via oauth but thats alot of work
I just followed what you said and made my own fork of RedSea to download Dolby Atmos here: https://github.com/zpoo32/RedSea Thanks for the help @112madgamer
Tidal uses according to a German website https://www.heise.de/newsticker/meldung/3D-Musikformat-Dolby-aeussert-sich-zur-Zukunft-von-Dolby-Atmos-Music-4630101.html Dolby AC-4 which is a proprietary format from Dolby Laboratories. Even when you can download the Dolby AC-4 file, there is (currently) no way to playback these files, read more here: https://en.wikipedia.org/wiki/Dolby_AC-4. Here is an example ac-4 file: https://github.com/google/ExoPlayer/blob/release-v2/library/core/src/test/assets/ts/sample.ac4 where you can try playing this file.
What I think, the 16MB request could be the audio file without the AC-4 filter and it requests AC-4 filter file separately and process while streaming.
Could you please tag me if you are copying my reply from https://github.com/yaronzz/Tidal-Media-Downloader/issues/252#issuecomment-627956926?
EDIT: Thanks!
I just followed what you said and made my own fork of RedSea to download Dolby Atmos here: https://github.com/zpoo32/RedSea Thanks for the help @112madgamer
Thank you @zpoo32 for the repo. I tried your RedSea version and manually added my
TIDALSESSION and AUTHHEADER to settings.py. Then I executed python redsea.py -p best_available https://tidal.com/browse/album/XXXXXXX and python redsea.py https://tidal.com/browse/album/XXXXXXX without any success. It downloaded just a AAC 96 kbit/s .mp4 file instead of a AC-4 .mp4 file - The Album is obviously availbable in Dolby Atmos.
Are you certain you are using the exact same URLs that play Dolby Atmos on the Tidal app?