---
libavformat/flvdec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 2d5e50e..e235c55 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -845,9 +845,13 @@ skip:
if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE)) {
int size;
const int64_t pos = avio_tell(s->pb);
+ // Read the last 4 bytes of the file, this should be the size of the
+ // previous FLV tag. Use the timestamp of its payload as duration.
const int64_t fsize = avio_size(s->pb);
avio_seek(s->pb, fsize - 4, SEEK_SET);
size = avio_rb32(s->pb);
+ // Seek to the previous FLV tag at position (fsize - 4 - size) but skip
+ // the byte indicating the type.
avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
if (size == avio_rb24(s->pb) + 11) {
uint32_t ts = avio_rb24(s->pb);
--
2.1.3
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