pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: Ref<NAFrame>) {
if let NABufferType::None = frm.get_buffer() { return; }
pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: Ref<NAFrame>) {
if let NABufferType::None = frm.get_buffer() { return; }