pts encoding fix patch by (Thomas Jarosch <tomj at simonv dot com>)

Originally committed as revision 1394 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.c

@@ -1056,6 +1056,7 @@ static int load_input_picture(MpegEncContext *s, AVFrame *pic_arg){
     }
     pic->quality= pic_arg->quality;
     pic->pict_type= pic_arg->pict_type;
+    pic->pts = pic_arg->pts;
     
     if(s->input_picture[encoding_delay])
         pic->display_picture_number= s->input_picture[encoding_delay]->display_picture_number + 1;