From dbe0ad85c1722b67fc681fcf084b8f7afdd15adf Mon Sep 17 00:00:00 2001
From: Ivan Schreter <schreter@gmx.net>
Date: Sun, 13 Sep 2009 08:57:30 +0000
Subject: [PATCH] Use I/O buffer size as initial value for backoff for seeking
 sync point search.

Originally committed as revision 19829 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/seek.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/seek.c b/libavformat/seek.c
index 758767e..93cb679 100644
--- a/libavformat/seek.c
+++ b/libavformat/seek.c
@@ -342,8 +342,8 @@ int64_t ff_gen_syncpoint_search(AVFormatContext *s,
 
     // Find keyframes in all active streams with timestamp/position just before
     // and just after requested timestamp/position.
-    step = 1024;
-    curpos = pos;
+    step = s->pb->buffer_size;
+    curpos = FFMAX(pos - step / 2, 0);
     for (;;) {
         url_fseek(s->pb, curpos, SEEK_SET);
         search_hi_lo_keyframes(s,
-- 
2.7.4