---
 libavformat/asfdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index b5fd5f7..367a3aa 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -928,7 +928,8 @@ static int asf_read_data(AVFormatContext *s, const 
GUIDParseTable *g)
                size, asf->nb_packets);
     avio_skip(pb, 2); // skip reserved field
     asf->first_packet_offset = avio_tell(pb);
-    align_position(pb, asf->offset, asf->data_size);
+    if (pb->seekable)
+        align_position(pb, asf->offset, asf->data_size);
 
     return 0;
 }
-- 
2.0.1

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