From d6f763659c6115e91d2fa981faffdb041d93f7a4 Mon Sep 17 00:00:00 2001
From: Mans Rullgard <mans@mansr.com>
Date: Tue, 15 Nov 2011 22:33:49 +0000
Subject: [PATCH] lavf: fix multiplication overflow in
 avformat_find_stream_info()

Converting to double before the multiplication rather than after
avoids an integer overflow in some cases.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit 52767d891c665ab1124fe4ce82d99b59673de7d2)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
---
 libavformat/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index d155599058..aa3ca5990b 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2368,7 +2368,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
                 for (i=1; i<FF_ARRAY_ELEMS(st->info->duration_error); i++) {
                     int framerate= get_std_framerate(i);
                     int ticks= lrintf(dur*framerate/(1001*12));
-                    double error= dur - ticks*1001*12/(double)framerate;
+                    double error = dur - (double)ticks*1001*12 / framerate;
                     st->info->duration_error[i] += error*error;
                 }
                 st->info->duration_count++;