Function gstreamer_video_sys::gst_video_vbi_encoder_add_ancillary

pub unsafe extern "C" fn gst_video_vbi_encoder_add_ancillary(
    encoder: *mut GstVideoVBIEncoder, 
    composite: gboolean, 
    DID: u8, 
    SDID_block_number: u8, 
    data: *const u8, 
    data_count: c_uint
) -> gboolean

This is supported on crate feature v1_16 only.