It's not supposed to be set outside of lavc.
---
libavformat/matroskadec.c | 4 ----
1 files changed, 0 insertions(+), 4 deletions(-)
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index a40aa1c..b136bba 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1519,10 +1519,6 @@ static int matroska_read_header(AVFormatContext *s,
AVFormatParameters *ap)
if (track->flag_forced)
st->disposition |= AV_DISPOSITION_FORCED;
- if (track->default_duration)
- av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
- track->default_duration, 1000000000, 30000);
-
if (!st->codec->extradata) {
if(extradata){
st->codec->extradata = extradata;
--
1.7.7.1
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