Fixes: Assertion failure in mov_read_iloc( in mov_read_iloc())
Fixes: 
62866/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5282997370486784

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/mov.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 2f29487beb8..e8efccf6ebf 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -4628,6 +4628,10 @@ static int mov_read_trak(MOVContext *c, AVIOContext *pb, 
MOVAtom atom)
     MOVStreamContext *sc;
     int ret;
 
+    if (c->is_still_picture_avif) {
+        return AVERROR_INVALIDDATA;
+    }
+
     st = avformat_new_stream(c->fc, NULL);
     if (!st) return AVERROR(ENOMEM);
     st->id = -1;
-- 
2.17.1

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