let vinfo = NACodecInfo::new(codec_name, vci, Some(edata));
let ret = strmgr.add_stream(NAStream::new(StreamType::Video, stream_id, vinfo, tb_num, tb_den, (frm_per_chunk * num_chunks) as u64));
if ret.is_some() {
let vinfo = NACodecInfo::new(codec_name, vci, Some(edata));
let ret = strmgr.add_stream(NAStream::new(StreamType::Video, stream_id, vinfo, tb_num, tb_den, (frm_per_chunk * num_chunks) as u64));
if ret.is_some() {