originally from
https://github.com/MythTV/mythtv/commit/1a9ae8fa0665b1c8928974f9a2176eb3aa27a7e5
---
libavformat/demux.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/demux.c b/libavformat/demux.c
index de792ceb3f..cbb8e37d45 100644
--- a/libavformat/demux.c
+++ b/libavformat/demux.c
@@ -868,6 +868,9 @@ static void update_initial_timestamps(AVFormatContext *s,
int stream_index,
uint64_t shift;
+ if (!st)
+ return;
+
if (sti->first_dts != AV_NOPTS_VALUE ||
dts == AV_NOPTS_VALUE ||
sti->cur_dts == AV_NOPTS_VALUE ||
--
2.43.0
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