In gxf muxer, round up number of lines mod 16 in mpeg umf data, based patch by Reuben Martin, reuben dot m at gmail dot com

Originally committed as revision 25401 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/gxfenc.c

@@ -190,7 +190,7 @@ static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)
                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
                     (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
                     st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
-                    starting_line, st->codec->height / 16);
+                    starting_line, (st->codec->height + 15) / 16);
     put_byte(pb, TRACK_MPG_AUX);
     put_byte(pb, size + 1);
     put_buffer(pb, (uint8_t *)buffer, size + 1);