matroskaenc: remove MATROSKA_ID_VIDEODISPLAYUNIT 3

Should fix ticket 1754

Thanks-to: Moritz Bunkus <moritz@bunkus.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/matroskaenc.c

@@ -640,7 +640,6 @@ static int mkv_write_tracks(AVFormatContext *s)
                     int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
-                    put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
                 }
 
                 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {