mpv & glslang-git causes symbol lookup error

[andykais]

Important Information

Provide following Information:

• mpv version: 0.33.0-191-ga17d79907a
• Linux Distribution and Version: arch linux
• Source of the mpv binary: https://aur.archlinux.org/packages/mpv-git
• If known which version of mpv introduced the problem: no
• Window Manager and version: i3-wm
• GPU driver and version: Intel(R) HD Graphics 520 (SKL GT2)
• Possible screenshot or video of visual glitches: n/a

Reproduction steps

1. on arch linux, install mpv (the issue is present on both mpv and mpv-git.
2. Install the latest glslang: yay -S glslang-git (version: 11.4.0.r47.gb38100f6-1)
3. mpv no longer functions: mpv: symbol lookup error: /usr/lib/libshaderc_shared.so.1: undefined symbol: _ZN8spvtools9Optimizer18RegisterSizePassesEv

Expected behavior

mpv runs without issue.

Actual behavior

no mpv command can be run. Only the above error is displayed.

Log file

N/A. Mpv crashes before a log file can be produced.

Sample files

N/A

Additional info

mpv works fine using the stable version of glslang (11.4.0-1). The necessity of glslang-git is that it is required to install either mpv-git or ffmpeg-git

[sfan5]

If you replace a dependency of shaderc (here: glslang) with a newer, incompatible version you will have to rebuild shaderc too or you end up with symbol lookup errors.
This is nothing to do with mpv.

Edit: Might also be that you have to rebuild mpv itself, but it's one of these two.

[andykais]

Im not sure the fix is as simple as that

rebuilding mpv

• yay -S glslang-git
• yay -S mpv-git
  results in:

[278/506] Linking build/mpv
[279/506] Compiling osdep/terminal-unix.c
[280/506] Compiling osdep/polldev.c
[281/506] Compiling video/vdpau.c
[282/506] Compiling audio/filter/af_drop.c
[283/506] Compiling audio/decode/ad_lavc.c
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../lib/libplacebo.so: undefined reference to symbol '_ZN7glslang7TShader10getInfoLogEv'
/usr/bin/ld: /usr/lib/libglslang.so.11: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Waf: Leaving directory `/home/andrew/.cache/yay/mpv-git/src/mpv/build'
Build failed
 -> task in 'mpv' failed with exit status 1 (run with -v to display more information)
==> ERROR: A failure occurred in build().
    Aborting...

rebuilding shaderc

• yay -S glslang-git
• pacman -S shaderc
  after the above steps, running mpv still results in:

mpv: symbol lookup error: /usr/lib/libshaderc_shared.so.1: undefined symbol: _ZN8spvtools9Optimizer18RegisterSizePassesEv

[sfan5]

libplacebo.so: undefined reference to symbol '_ZN7glslang7TShader10getInfoLogEv'

rebuild that too

[andykais]

• yay -S glslang-git
• pacman -S shaderc libplacebo
• yay -S mpv-git

seeing the same

/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../lib/libplacebo.so: undefined reference to symbol '_ZN7glslang7TShader10getInfoLogEv'
/usr/bin/ld: /usr/lib/libglslang.so.11: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

error while building mpv-git. Perhaps I need to also install shaderc-git and/or libplacebo-git

[andykais]

ok that did the trick! Here are the steps I needed to perform:

• yay -S glslang-git
• yay -S shaderc-git libplacebo-git
• yay -S mpv-git

mpv now works correctly

[ramis-svitla]

For me this is because chrome provides a broken copy of vulkan which is loaded while it tries to execute mpv. The fix is to make a little wrapper at /usr/local/bin/mpv that preloads the system version of vulkan:
#!/bin/sh export LD_PRELOAD=/usr/lib/libvulkan.so.1 exec /usr/bin/mpv "$@"