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-rw-r--r--libavformat/matroskaenc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index cab43f499e..868861615f 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -769,6 +769,8 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
// if we need to clear it.
if (!(st->disposition & AV_DISPOSITION_DEFAULT))
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
+ if (st->disposition & AV_DISPOSITION_FORCED)
+ put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, !!(st->disposition & AV_DISPOSITION_FORCED));
if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->initial_padding) {
mkv->tracks[i].ts_offset = av_rescale_q(codec->initial_padding,