When a JACOsub subtitle has two timestamps, they represent its start and
end times (http://unicorn.us.com/jacosub/jscripts.html#l_times); the
duration is the difference between the two, not the sum of the two.
Tested using MPV, a LaserDisc, and some authentic 1993 JACOsub files.
---
libavformat/jacosubdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/jacosubdec.c b/libavformat/jacosubdec.c
index 520c435cc5..f6be5df2d7 100644
--- a/libavformat/jacosubdec.c
+++ b/libavformat/jacosubdec.c
@@ -127,7 +127,7 @@ shift_and_ret:
ts_start = (ts_start + jacosub->shift) * 100 / jacosub->timeres;
ts_end = (ts_end + jacosub->shift) * 100 / jacosub->timeres;
*start = ts_start;
- *duration = ts_start + ts_end;
+ *duration = ts_end - ts_start;
return buf + len;
}
--
2.20.1
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