af-toggle causes label not found warning

mpv version and platform

mpv 0.30.0 Arch Linux

Reproduction steps

~/.config/mpv/mpv.conf

af-add=@loudnorm:!lavfi=[loudnorm=I=-23:LRA=20:TP=-1,aresample=48000]

[audio-norm]
af-toggle=@loudnorm

Then play any file with and without --profile=audio-norm.

Expected behavior

No warning. When mpv checks the configuration the label @loudnorm is included in profile [audio-norm].

Actual behavior

No matter if the profile is activated I get the warning Option af-toggle: Label loudnorm not found.

Despite the warning it works. Playing a file without the profile [audio-norm] leaves the filter disabled and with the profile the filter is activated.

Thoughts

It's also interesting that the warning appears even if the label is defined in profile [audio-norm] itself. Is af|vf-toggle deprecated? There is no option entry in the man page either. Just af|vf toggle for input.conf.

I don't know if there is anything that can realistically be done about the warning when checking the config. In this example [default] is always included in [audio-norm] which is why the toggle works.

But one could also define the label in another profile which isn't included. If it works at runtime would then depend on the order the profiles are applied through input.conf and --profile=.

Should this particular warning message therefore only be displayed when the toggle is being applied at runtime? It currently also gives the warning when checking the config.

Maybe the way I use it also doesn't make the most sense. I wanted to define a label once and then use something like af-add=@loudnorm which would do nothing if it is already activated. So chaining profiles wouldn't neccessarily toggle it back off again. But add expects an actual filter after the label.

Start with the configuration in ~/.config/mpv/mpv.conf and trace how af-toggle validates labels during config checking versus runtime profile application. Reproduce with the [audio-norm] profile and the @loudnorm label; done means the warning behavior matches whether the label is available when the toggle is applied.