From f3dab5fb6d6290721038dea2e5b1778abecd232d Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Sun, 26 Feb 2012 17:21:07 -0500
Subject: [PATCH] movenc: use the first cluster duration as the tfhd default
 duration

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

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index e2781accbe..a74dd2e683 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2215,7 +2215,7 @@ static int mov_write_tfhd_tag(AVIOContext *pb, MOVTrack *track,
     if (flags & MOV_TFHD_BASE_DATA_OFFSET)
         avio_wb64(pb, moof_offset);
     if (flags & MOV_TFHD_DEFAULT_DURATION) {
-        track->default_duration = track->audio_vbr ? track->enc->frame_size : 1;
+        track->default_duration = get_cluster_duration(track, 0);
         avio_wb32(pb, track->default_duration);
     }
     if (flags & MOV_TFHD_DEFAULT_SIZE) {