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-rw-r--r--libavformat/movenc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 30d397a349..761c3e8323 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1518,7 +1518,7 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVMuxContext *mov,
display_matrix = (uint32_t*)av_stream_get_side_data(st, AV_PKT_DATA_DISPLAYMATRIX,
&display_matrix_size);
- if (display_matrix_size < 9 * sizeof(*display_matrix))
+ if (display_matrix && display_matrix_size < 9 * sizeof(*display_matrix))
display_matrix = NULL;
}