http_get_line    1163 libavformat/http.c         if ((err = http_get_line(s, line, sizeof(line))) < 0)
http_get_line    1397 libavformat/http.c                 if ((err = http_get_line(s, line, sizeof(line))) < 0)
http_get_line    1408 libavformat/http.c                 http_get_line(s, line, sizeof(line)); // read empty chunk