From 3face4300ed01d0b9394efab4dfdcf997cc48704 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Fri, 24 May 2013 12:00:44 +0200
Subject: [PATCH] demux_lavf: print how many bytes are read by
 avformat_find_stream_info()

Can be helpful for debugging slow stream startup.

Also add a comment about BIO_BUFFER_SIZE.
---
 demux/demux_lavf.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/demux/demux_lavf.c b/demux/demux_lavf.c
index 5eebffc2f9..2141d3ab0a 100644
--- a/demux/demux_lavf.c
+++ b/demux/demux_lavf.c
@@ -61,6 +61,8 @@ const m_option_t lavfdopts_conf[] = {
     {NULL, NULL, 0, 0, 0, 0, NULL}
 };
 
+// Should correspond to IO_BUFFER_SIZE in libavformat/aviobuf.c (not public)
+// libavformat (almost) always reads data in blocks of this size.
 #define BIO_BUFFER_SIZE 32768
 
 typedef struct lavf_priv {
@@ -524,6 +526,10 @@ static demuxer_t *demux_open_lavf(demuxer_t *demuxer)
                "LAVF_header: av_find_stream_info() failed\n");
         return NULL;
     }
+
+    mp_msg(MSGT_HEADER, MSGL_V, "demux_lavf: avformat_find_stream_info() "
+           "finished after %"PRId64" bytes.\n", stream_tell(demuxer->stream));
+
     /* Add metadata. */
     while ((t = av_dict_get(avfc->metadata, "", t,
                             AV_DICT_IGNORE_SUFFIX)))