From 19064a36e39a113568cb4ea2d581747fd43e055a Mon Sep 17 00:00:00 2001
From: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Date: Tue, 1 Sep 2020 15:21:52 +0100
Subject: [PATCH] avformat/mov: Do not try and seek to an mfra if the reader
 can't seek

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
---
 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index f0b4edc2ed..49c2d05d21 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5094,7 +5094,7 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 
     // See if the remaining bytes are just an mfra which we can ignore.
     is_complete = offset == stream_size;
-    if (!is_complete) {
+    if (!is_complete && (pb->seekable & AVIO_SEEKABLE_NORMAL)) {
         int64_t ret;
         int64_t original_pos = avio_tell(pb);
         int32_t mfra_size;