AVERROR_HTTP_NOT_FOUND   56 doc/examples/http_multiclient.c         reply_code = AVERROR_HTTP_NOT_FOUND;
AVERROR_HTTP_NOT_FOUND  397 libavformat/http.c         case 404: return AVERROR_HTTP_NOT_FOUND;
AVERROR_HTTP_NOT_FOUND  429 libavformat/http.c     case AVERROR_HTTP_NOT_FOUND: