Some subtitles (e.g. PGS) do not require a duration since they have
explicit end-of-subtitle indication in the stream. This provides
a way to omit the unnecessary duration while muxing.
---
libavformat/matroskaenc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 49e5bf3..1dd8d74 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1524,7 +1524,8 @@ static int mkv_write_packet_internal(AVFormatContext *s,
AVPacket *pkt)
mkv_blockgroup_size(pkt->size));
duration = pkt->convergence_duration;
mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
- put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
+ if (pkt->convergence_duration != AV_NOPTS_VALUE)
+ put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
end_ebml_master(pb, blockgroup);
}
--
2.1.0
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