(ret = avformat_write_header(fmt, NULL)) < 0 ||
(ret = av_interleaved_write_frame(fmt, &pkt2)) < 0 ||
(ret = av_write_trailer(fmt)) < 0) {
(ret = avformat_write_header(fmt, NULL)) < 0 ||
(ret = av_interleaved_write_frame(fmt, &pkt2)) < 0 ||
(ret = av_write_trailer(fmt)) < 0) {