Fix frame rate detection for RM video files with patch used by XBMC.

http://article.gmane.org/gmane.comp.video.ffmpeg.devel/101003

Fixes #9420.

mythtv/external/FFmpeg/libavformat/rmdec.c

@@ -294,18 +294,17 @@ ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
             goto fail1;
         st->codec->width = get_be16(pb);
         st->codec->height = get_be16(pb);
-        st->codec->time_base.num= 1;
+        st->codec->time_base.num= 1 << 16;
         fps= get_be16(pb);
         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
         get_be32(pb);
-        fps2= get_be16(pb);
-        get_be16(pb);
+        fps2= get_be32(pb);
 
         if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (url_ftell(pb) - codec_pos))) < 0)
             return ret;
 
 //        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
-        st->codec->time_base.den = fps * st->codec->time_base.num;
+        st->codec->time_base.den = fps2;
         //XXX: do we really need that?
         switch(st->codec->extradata[4]>>4){
         case 1: st->codec->codec_id = CODEC_ID_RV10; break;