---
libavformat/movenc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 122bc2d..67c7214 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2490,7 +2490,8 @@ static int mov_write_trun_tag(AVIOContext *pb,
MOVMuxContext *mov,
if (i > 0 && get_sample_flags(track, &track->cluster[i]) !=
track->default_sample_flags)
flags |= MOV_TRUN_SAMPLE_FLAGS;
}
- if (!(flags & MOV_TRUN_SAMPLE_FLAGS))
+ if (!(flags & MOV_TRUN_SAMPLE_FLAGS) && track->entry > 0 &&
+ get_sample_flags(track, &track->cluster[0]) !=
track->default_sample_flags)
flags |= MOV_TRUN_FIRST_SAMPLE_FLAGS;
if (track->flags & MOV_TRACK_CTTS)
flags |= MOV_TRUN_SAMPLE_CTS;
--
1.9.3 (Apple Git-50)
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