downgrade mov negative ctts log message to warning, patch by Art Clarke,...

downgrade mov negative ctts log message to warning, patch by Art Clarke, aclarke at vlideshow dot com

Originally committed as revision 14492 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mov.c

@@ -1125,7 +1125,7 @@ static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
         int duration =get_be32(pb);
 
         if (duration < 0) {
-            av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");
+            av_log(c->fc, AV_LOG_WARNING, "negative ctts, ignoring\n");
             sc->ctts_count = 0;
             url_fskip(pb, 8 * (entries - i - 1));
             break;