Be less noisy with invalid pts/dts.

Originally committed as revision 17482 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -810,7 +810,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
     // we take the conservative approach and discard both
     // Note, if this is misbehaving for a H.264 file then possibly presentation_delayed is not set correctly.
     if(delay==1 && pkt->dts == pkt->pts && pkt->dts != AV_NOPTS_VALUE && presentation_delayed){
-        av_log(s, AV_LOG_ERROR, "invalid dts/pts combination\n");
+        av_log(s, AV_LOG_WARNING, "invalid dts/pts combination\n");
         pkt->dts= pkt->pts= AV_NOPTS_VALUE;
     }