mpv cannot set output to a single channel on external soundcard

[dbojan]

mpv Information

mpv 0.35.0-79-gc8a90001f2 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
 built on Sun Jan 08 12:30:07 2023
libplacebo version: v5.234.0
FFmpeg version: git-2023-01-06-fcd557a2c
FFmpeg library versions:
   libavutil       57.43.100
   libavcodec      59.56.100
   libavformat     59.34.102
   libswscale      6.8.112
   libavfilter     8.53.100
   libswresample   4.9.100

Other Information

- Windows version: Microsoft Windows [Version 10.0.10586]
- GPU model, driver and version: Intel(R) HD Graphics 4400 , Intel driver, version 20.19.15.4326
- Source of mpv: mpv site
- Latest known working version: mpv 0.35.0-79-gc8a90001f2 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
- Issue started after the following happened: always

- Note, I cannot test it with latest mpv version, cause it won't run on my system, as described here: https://github.com/mpv-player/mpv/issues/15526
- I am using usb external sound card with sound output, and microphone input.

Reproduction Steps

mpv --audio-device=help

'auto' (Autoselect device)
'wasapi/{11151e3e-0725-4fac-80a2-ae35fd286a96}' (Speakers (USB PnP Sound Device))
'wasapi/{595d9bbe-c778-4f94-8a8d-932fd4705972}' (Speakers (USB Audio Device))
'wasapi/{604a508a-9307-46f4-a3dc-120c3e3883e5}' (Speakers (Realtek High Definition Audio))
'openal' (Default (openal))
'sdl' (Default (sdl))

it works ok with integrated audio card, sound is sent to one channel only.
mpv --audio-device=wasapi/{604a508a-9307-46f4-a3dc-120c3e3883e5} --audio-channels=fr "http://naxidigital-fresh128.streaming.rs:8210/"

it does not external card, sound is sent to both left and right channels
mpv --audio-device=wasapi/{595d9bbe-c778-4f94-8a8d-932fd4705972} --audio-channels=fr "http://naxidigital-fresh128.streaming.rs:8210/"

I tried with bl, sl, dl, wl, tfl ... single channel configuration, but it still does not sen

Expected Behavior

To send sound to to one channel only, like it does with integrated sound card,

Actual Behavior

Sound was sent to both left and right channel.

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.