MPV_FORMAT_NONE constant
int
const MPV_FORMAT_NONE
Invalid. Sometimes used for empty values. This is always defined to 0, so a normal 0-init of mpv_format (or e.g. mpv_node) is guaranteed to set this it to MPV_FORMAT_NONE (which makes some things saner as consequence).
Implementation
static const int MPV_FORMAT_NONE = 0;