Function ffmpeg_dev::sys::ff_rfps_add_frame

pub unsafe extern "C" fn ff_rfps_add_frame(
    ic: *mut AVFormatContext, 
    st: *mut AVStream, 
    dts: i64
) -> c_int

add frame for rfps calculation.

@param dts timestamp of the i-th frame @return 0 if OK, AVERROR_xxx on error