gistfile1.diff

diff --git a/libavformat/utils.c b/libavformat/utils.c
index b992923..30c0192 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2486,6 +2486,10 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
     // close codecs which were opened in try_decode_frame()
     for(i=0;i<ic->nb_streams;i++) {
         st = ic->streams[i];
+        if (!has_codec_parameters(st)) {
+            av_log(ic, AV_LOG_WARNING,
+                   "codec parameters not found for stream %d\n", i);
+        }
         avcodec_close(st->codec);
     }
     for(i=0;i<ic->nb_streams;i++) {