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-rw-r--r--libavformat/matroska.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/libavformat/matroska.c b/libavformat/matroska.c
index ee42392344..1cca2929b4 100644
--- a/libavformat/matroska.c
+++ b/libavformat/matroska.c
@@ -2209,6 +2209,10 @@ matroska_read_header (AVFormatContext *s,
st->codec->codec_id = codec_id;
+ if (track->default_duration)
+ av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
+ track->default_duration, 1000000000, 30000);
+
if(extradata){
st->codec->extradata = extradata;
st->codec->extradata_size = extradata_size;