Hi!

Attached patch prints the tag and the tag size when ignoring the size.

Please comment, Carl Eugen
From e99dc274b7b4b4b5ef502ddb0a8245c1f47c2ece Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <ceho...@ag.or.at>
Date: Tue, 18 Oct 2016 00:37:06 +0200
Subject: [PATCH] lavf/avidec: Be more verbose when ignoring very large tag
 size.

---
 libavformat/avidec.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index b291625..2fcb0ee 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -986,7 +986,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
             if (size > 1000000) {
                 av_log(s, AV_LOG_ERROR,
                        "Something went wrong during header parsing, "
-                       "I will ignore it and try to continue anyway.\n");
+                       "tag %c%c%c%c has size %u, "
+                       "I will ignore it and try to continue anyway.\n",
+                       tag & 0xff, tag >> 8 & 0xff, tag >> 16 & 0xff, tag >> 
24 & 0xff,
+                       size);
                 if (s->error_recognition & AV_EF_EXPLODE)
                     goto fail;
                 avi->movi_list = avio_tell(pb) - 4;
-- 
1.7.10.4

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