let mut frm = NAFrame::new_from_pkt(pkt, info, NABufferType::AudioPacked(abuf));
frm.set_duration(Some(duration));
frm.set_keyframe(true);
let mut frm = NAFrame::new_from_pkt(pkt, info, NABufferType::AudioPacked(abuf));
frm.set_duration(Some(duration));
frm.set_keyframe(true);