let (tb_num, tb_den) = stream.get_timebase();
let ts = NATimeInfo::new(Some(self.cur_frame[stream_no as usize]), None, None, tb_num, tb_den);
let pkt = self.src.read_packet(stream, ts, false, size)?;
let (tb_num, tb_den) = stream.get_timebase();
let ts = NATimeInfo::new(Some(self.cur_frame[stream_no as usize]), None, None, tb_num, tb_den);
let pkt = self.src.read_packet(stream, ts, false, size)?;