MP4 files with fragments might have the first moof box that is mentioned
in a fragment index before the first mdat box. Since it is then already
parsed by mov_read_header, we have to make sure that mov_switch_root
will not parse it again when seeking by setting the headers_read flag in
the index. Parsing it a second time would cause the ctts_data array to
receive a second copy of the information from the trun box, leading to
wrong PTS values for the second and following fragments in presence of
B-frames.
Fixes ticket 6560.
Signed-off-by: Daniel Glöckner <daniel...@gmx.net>
---
libavformat/mov.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 63f84be..c2da1b6 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -6345,6 +6345,13 @@ static int mov_read_header(AVFormatContext *s)
}
ff_configure_buffers_for_index(s, AV_TIME_BASE);
+ for (i = 0; i < mov->fragment_index_count; i++) {
+ MOVFragmentIndex *idx = mov->fragment_index_data[i];
+ for (j = 0; j < idx->item_count; j++)
+ if (idx->items[j].moof_offset <= mov->fragment.moof_offset)
+ idx->items[j].headers_read = 1;
+ }
+
return 0;
}
--
2.7.0
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