analyze end condition must match r_fps selection condition

fixes fps for Channel\ 4\ News_Channel\ 4_20_10_2006_19_00_01.dvr-ms

Originally committed as revision 8557 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -1697,7 +1697,7 @@ int av_find_stream_info(AVFormatContext *ic)
             if (!has_codec_parameters(st->codec))
                 break;
             /* variable fps and no guess at the real fps */
-            if(   st->codec->time_base.den >= 101LL*st->codec->time_base.num
+            if(   (st->codec->time_base.den >= 101LL*st->codec->time_base.num || st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
                && duration_count[i]<20 && st->codec->codec_type == CODEC_TYPE_VIDEO)
                 break;
             if(st->parser && st->parser->parser->split && !st->codec->extradata)