libavformat/utils: Only require first packet to be known for all audio and video streams

It can take a long time before subtitles or data streams show up,
so we shouldn't wait for those before assuming we have all info
for streams.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/utils.c

@@ -2359,7 +2359,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
                 break;
             if(st->parser && st->parser->parser->split && !st->codec->extradata)
                 break;
-            if(st->first_dts == AV_NOPTS_VALUE)
+            if(st->first_dts == AV_NOPTS_VALUE && (st->codec->codec_type == AVMEDIA_TYPE_VIDEO || st->codec->codec_type == AVMEDIA_TYPE_AUDIO))
                 break;
         }
         if (i == ic->nb_streams) {