From ee8c18387d02a7ee5ee3317cf1cecd84a7e0d91a Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Sun, 17 May 2015 12:57:27 +0200
Subject: [PATCH] lavf/mpeg: Do not detect unknown audio in Hikvision streams
 as alaw.

---
 libavformat/mpeg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 9cc0422dff..edb134f740 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -550,7 +550,7 @@ redo:
             codec_id = AV_CODEC_ID_ADPCM_ADX;
             // Auto-detect AC-3
             request_probe = 50;
-        } else if (m->imkh_cctv && startcode == 0x1c0) {
+        } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
             codec_id = AV_CODEC_ID_PCM_ALAW;
             request_probe = 50;
         } else {