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-rw-r--r--src/lib/subtitle.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lib/subtitle.cc b/src/lib/subtitle.cc
index 451d83691..f851d5643 100644
--- a/src/lib/subtitle.cc
+++ b/src/lib/subtitle.cc
@@ -35,6 +35,8 @@ using namespace boost;
*/
TimedSubtitle::TimedSubtitle (AVSubtitle const & sub)
{
+ assert (sub.rects > 0);
+
/* subtitle PTS in seconds */
float const packet_time = (sub.pts / AV_TIME_BASE) + float (sub.pts % AV_TIME_BASE) / 1e6;