Function ffav_sys::avcodec_find_best_pix_fmt_of_2

pub unsafe extern "C" fn avcodec_find_best_pix_fmt_of_2(
    dst_pix_fmt1: AVPixelFormat, 
    dst_pix_fmt2: AVPixelFormat, 
    src_pix_fmt: AVPixelFormat, 
    has_alpha: c_int, 
    loss_ptr: *mut c_int
) -> AVPixelFormat

@deprecated see av_find_best_pix_fmt_of_2()