Y4M_LINE_MAX      172 libavformat/yuv4mpegenc.c     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s%s\n",
Y4M_LINE_MAX      188 libavformat/yuv4mpegenc.c     char buf2[Y4M_LINE_MAX + 1];