index into segmentlists_tab was specified as 4 instead of 3 causing invalid 
access

further fix to: 8135

Signed-off-by: vectronic <hello.vectro...@gmail.com>
---
 libavformat/dashdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index 738bfeaefb..7713ee8907 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -1017,7 +1017,7 @@ static int parse_manifest_representation(AVFormatContext 
*s, const char *url,
 
             duration_val = get_val_from_nodes_tab(segmentlists_tab, 3, 
"duration");
             timescale_val = get_val_from_nodes_tab(segmentlists_tab, 3, 
"timescale");
-            startnumber_val = get_val_from_nodes_tab(segmentlists_tab, 4, 
"startNumber");
+            startnumber_val = get_val_from_nodes_tab(segmentlists_tab, 3, 
"startNumber");
             if (duration_val) {
                 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 
10);
                 av_log(s, AV_LOG_TRACE, "rep->fragment_duration = 
[%"PRId64"]\n", rep->fragment_duration);
-- 
2.20.1 (Apple Git-117)

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