I'm not sure we understood each other correctly.
I need the ability to disable BASS on video files. That is, if BASS sees a video track in a file, it shouldn't open it. I need to use BASS only for audio files.
There are similar keys in plugins that work:
BASS_CONFIG_MP4_VIDEO = false. This seems to work if the file has an AAC track. But it doesn't work with some other formats.
BASS_CONFIG_WMA_VIDEO = false. It works (but I don't have enough samples to test).
In BASS:
BASS_CONFIG_MF_VIDEO = false. I think this works if Media Foundation is connected (аnd not compatible with BASS_CONFIG_MF_DISABLE = true).