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-rw-r--r--libavformat/subtitles.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavformat/subtitles.c b/libavformat/subtitles.c
index c6701c6a60..3ba5e2b217 100644
--- a/libavformat/subtitles.c
+++ b/libavformat/subtitles.c
@@ -437,6 +437,7 @@ ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size)
size_t cur = 0;
if (!size)
return 0;
+ buf[0] = '\0';
while (cur + 1 < size) {
unsigned char c = ff_text_r8(tr);
if (!c)