use pts based duration/bitrate guessing code for mpeg-ts

Originally committed as revision 3731 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -1617,7 +1617,7 @@ static void av_estimate_timings(AVFormatContext *ic)
     }
     ic->file_size = file_size;
 
-    if (ic->iformat == &mpegps_demux && file_size && !ic->pb.is_streamed) {
+    if ((ic->iformat == &mpegps_demux || ic->iformat == &mpegts_demux) && file_size && !ic->pb.is_streamed) {
         /* get accurate estimate from the PTSes */
         av_estimate_timings_from_pts(ic);
     } else if (av_has_timings(ic)) {