MPV_EVENT_METADATA_UPDATE constant
int
const MPV_EVENT_METADATA_UPDATE
Happens when metadata (like file tags) is possibly updated. (It's left unspecified whether this happens on file start or only when it changes within a file.)
@deprecated This is equivalent to using mpv_observe_property() on the "metadata" property. The event is redundant, and might be removed in the far future.
Implementation
static const int MPV_EVENT_METADATA_UPDATE = 19;