Remix: stereo -> 7.1 not working #17054
Description
mpv Information
[ 0.002][v][cplayer] mpv v0.40.0-dev-g748260893 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
[ 0.002][v][cplayer] built on Nov 17 2025 04:53:58
[ 0.002][v][cplayer] libplacebo version: v7.357.0
[ 0.002][v][cplayer] FFmpeg version: e57d7aa
[ 0.002][v][cplayer] FFmpeg library versions:
[ 0.002][v][cplayer] libavcodec 62.11.100
[ 0.002][v][cplayer] libavdevice 62.1.100
[ 0.002][v][cplayer] libavfilter 11.4.100
[ 0.002][v][cplayer] libavformat 62.3.100
[ 0.002][v][cplayer] libavutil 60.8.100
[ 0.002][v][cplayer] libswresample 6.1.100
[ 0.002][v][cplayer] libswscale 9.1.100
[ 0.002][v][cplayer] Configuration: -Ddefault_library=static -Dlibmpv=true -Dtests=true -Dgpl=true -Dffmpeg:gpl=enabled -Dffmpeg:tests=enabled -Dffmpeg:programs=enabled -Dffmpeg:sdl2=disabled -Dffmpeg:vulkan=auto -Dffmpeg:libdav1d=enabled -Dffmpeg:libjxl=enabled -Dffmpeg:libaom=enabled -Dlcms2:fastfloat=true -Dlcms2:jpeg=disabled -Dlcms2:tiff=disabled -Dlibass:test=enabled -Dlibjpeg-turbo:tests=disabled -Dlibusb:tests=false -Dlibusb:examples=false -Dlibplacebo:demos=false -Dlibplacebo:lcms=enabled -Dlibplacebo:shaderc=enabled -Dlibplacebo:tests=false -Dlibplacebo:vulkan=enabled -Dlibplacebo:d3d11=enabled -Dxxhash:inline-all=true -Dxxhash:cli=false -Dluajit:amalgam=true -Dd3d11=enabled -Dvulkan=enabled -Djavascript=enabled -Dwin32-smtc=enabled -Dlua=luajit -Ddrm=disabled -Dlibarchive=disabled -Drubberband=disabled -Dwayland=disabled -Dx11=disabled -Dwrap_mode=forcefallback
[ 0.002][v][cplayer] List of enabled features: build-date cplugins cuda-hwaccel cuda-interop d3d-hwaccel d3d11 d3d9-hwaccel debug direct3d dos-paths dxgi-debug-d3d11 ffmpeg ffnvcodec gl gl-win32 glob glob-win32 gpl iconv javascript jpeg lcms2 libass libavdevice libdl libplacebo luajit shaderc spirv-cross uchardet vector vk-khr-display vulkan wasapi win32 win32-desktop win32-executable win32-smtc win32-threads zlibOther Information
- Windows version: Windows 11 25H2
- GPU model, driver and version: AMD Ryzen 7 9800X3D
- Source of mpv: https://nightly.link/mpv-player/mpv/workflows/build/master/mpv-x86_64-pc-windows-msvc
- Latest known working version: -
- Issue started after the following happened: -
Reproduction Steps
I am using: "audio-channels=8" via config. The log shows "Remix: stereo -> 7.1" but I only hear sound from the front left/right speakers. Log attached.
Expected Behavior
Sounds plays 7 speakers + sub
Actual Behavior
Only two speakers have sound
Log File
Sample Files
Any stereo mp3
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.