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-rw-r--r--libavformat/avidec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 79000f3e81..547eb63b1b 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -135,7 +135,7 @@ static inline int get_duration(AVIStream *ast, int len)
if (ast->sample_size)
return len;
else if (ast->dshow_block_align)
- return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
+ return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
else
return 1;
}