the only thing you need to know about
FWIW you also need to know about this implicit behavior if you expected +mfplat and GStreamer logging to be configured independently but the default behavior isn't.
Well, I guess it isn't hard to figure out if you can grep `GST_DEBUG` in the wine codebase. I assume `GST_DEBUG` is and will ever be the only envvar responsible for controlling the source of "GStreamer-LEVEL: [...]" messages.[^1]
In that case, I don't necessarily see a need for a separate channel? *Maybe* if Wine had hierarchical logger configuration, but that doesn't exist (yet). Wine debug channels have always been ad-hoc; I don't think there is a hard rule for strict separation.
[^1]: which you can disable with `GST_DEBUG=0`.