Y4M_FRAME_MAGIC_LEN  277 libavformat/yuv4mpegdec.c     s->packet_size = av_image_get_buffer_size(st->codecpar->format, width, height, 1) + Y4M_FRAME_MAGIC_LEN;
Y4M_FRAME_MAGIC_LEN  311 libavformat/yuv4mpegdec.c     ret = av_get_packet(s->pb, pkt, s->packet_size - Y4M_FRAME_MAGIC_LEN);
Y4M_FRAME_MAGIC_LEN  314 libavformat/yuv4mpegdec.c     else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN) {