avformat/flvdec: Print stream type in case a new stream is discovered after the header

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/flvdec.c

@@ -953,7 +953,7 @@ skip:
         }
         if (i == s->nb_streams) {
             static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};
-            av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n");
+            av_log(s, AV_LOG_WARNING, "%s stream discovered after head already parsed\n", av_get_media_type_string(stream_types[stream_type]));
             st = create_stream(s, stream_types[stream_type]);
             if (!st)
                 return AVERROR(ENOMEM);