--audio-spdif=<codec> passthrough not working with spdif

[joskezelensky]

mpv Information

mpv v0.39.0-502-ge52f9758 Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Dec 14 2024 00:11:14
libplacebo version: v7.350.0 (v7.349.0-30-g056b852-dirty)
FFmpeg version: N-118070-g17e474668
FFmpeg library versions:
   libavcodec      61.27.101
   libavdevice     61.4.100
   libavfilter     10.6.101
   libavformat     61.9.101
   libavutil       59.51.100
   libswresample   5.4.100
   libswscale      8.12.100

Other Information

- Windows version:
Microsoft Windows [Version 10.0.19045.5247]
- GPU model, driver and version:
	Intel(R) HD Graphics 5500

	Driver version:	20.19.15.4531
	Driver date:	29/09/2016
	DirectX version:	12 (FL 11.1)
- Source of mpv:
https://github.com/shinchiro/mpv-winbuild-cmake/releases
- Latest known working version:
/
- Issue started after the following happened:
/

Reproduction Steps

mpv --no-config --audio-spdif=truehd Triangle.of.Sadness.2022.BluRay.TrueHD.7.1.Atmos.outro.mka

Expected Behavior

atmos data gets passed through correctly

Actual Behavior

popping sound on the speakers, spdif doesn't get passed through correctly
using a Marantz ki pearl & a marantz network audio player na7004

Log File

output.txt

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

[joskezelensky]

important to note is that the s/pdif is actually usb (digital in usb on the marantz NA7004 dac; and spdif interface (usb) on the windows machine

[jeeb]

Relevant bits

[   0.094][v][ao] Trying audio driver 'wasapi'
[   0.094][v][ao/wasapi] requested format: 192000 Hz, 7.1 channels, spdif-truehd
[   0.094][d][ao/wasapi] Init wasapi
[   0.094][d][ao/wasapi] Find device ''
[   0.094][v][autoload] Prepending PXL_20241216_193854327.jpg
[   0.094][v][autoload] Prepending fabien-troncal-120.jpg
[   0.096][d][dyn_menu] update menu: Chapters
[   0.096][d][dyn_menu] commit menu items: user-data/menu/items
[   0.096][v][ao/wasapi] No device specified. Selecting default.
[   0.098][v][ao/wasapi] Selecting device '{4bfec8e1-3bae-413b-8165-b37fb63635bb}' (SPDIF Interface (NA7004 Digital In USB))
[   0.098][v][ao/wasapi] Monitoring changes in device {0.0.0.00000000}.{4bfec8e1-3bae-413b-8165-b37fb63635bb}
[   0.098][d][ao/wasapi] Init wasapi thread
[   0.099][d][ao/wasapi] Activating pAudioClient interface
[   0.102][d][ao/wasapi] Probing formats
[   0.105][v][ao/wasapi] Trying 7.1 spdif-truehd (16/16 bits) @ 192000hz (exclusive) -> unsupported
[   0.105][v][ao/wasapi] Retrying as AC3.
[   0.106][v][ao/wasapi] Trying 7.1 spdif-ac3 (16/16 bits) @ 192000hz (exclusive) -> unsupported
[   0.106][d][ao/wasapi] Uninit wasapi
[   0.106][d][ao/wasapi] Thread shutdown
[   0.106][d][ao/wasapi] Thread uninit done
[   0.106][d][ao/wasapi] Thread return
[   0.106][d][ao/wasapi] Uninit wasapi done

So the WASAPI output device is trying to get exclusive lock on the device and configure it for TrueHD (KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_MLP), and then that fails with AUDCLNT_E_UNSUPPORTED_FORMAT (since you see the "unsupported" text).

Are you sure this interface can take in TrueHD and not just E-AC-3? Could be worth getting a listing of what it says it supports if it can be queried somehow.

edit: there seem to be some additional identifiers nowadays, But KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_MLP is still the base one. So yea, querying would make sense since that hopefully would give a listing of things it might accept.

Note: none of the active developers of mpv have bitstreaming capable hardware, so in case of non-obvious issues users have to check a lot of stuff on their side.

[joskezelensky]

from the dac's features list
• USB Type B digital input accepts high bit rate audio files from personal computers
and it states that opt/coax only takes pcm and no dts/dolby as input so i'm guessing that usb does support dts?