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-rw-r--r--libavformat/subviewerdec.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/libavformat/subviewerdec.c b/libavformat/subviewerdec.c
index fdca3a4820..5c2fe676f1 100644
--- a/libavformat/subviewerdec.c
+++ b/libavformat/subviewerdec.c
@@ -148,6 +148,10 @@ static int subviewer_read_header(AVFormatContext *s)
new_event = 1;
pos = avio_tell(s->pb);
} else if (*line) {
+ if (pts_start == AV_NOPTS_VALUE) {
+ res = AVERROR_INVALIDDATA;
+ goto end;
+ }
if (!new_event) {
sub = ff_subtitles_queue_insert(&subviewer->q, "\n", 1, 1);
if (!sub) {