---
I tested fragmented files with PCM and AAC, and both play correctly in QT.

 libavformat/movenc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index e2781ac..a74dd2e 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) {
-- 
1.7.1

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