From cda0dc907094bcc75ac00f24f05b5a577961e47e Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Fri, 4 Mar 2016 23:58:44 +0100
Subject: demux_mkv: correctly export unknown packet durations

Instead of just setting the duration to 0.
---
 demux/demux_mkv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/demux/demux_mkv.c b/demux/demux_mkv.c
index c932b45f39..5e6de8619d 100644
--- a/demux/demux_mkv.c
+++ b/demux/demux_mkv.c
@@ -152,7 +152,7 @@ typedef struct mkv_index {
 
 struct block_info {
     uint64_t duration, discardpadding;
-    bool simple, keyframe;
+    bool simple, keyframe, duration_known;
     int64_t timecode;
     mkv_track_t *track;
     bstr data;
@@ -2461,7 +2461,7 @@ static int handle_block(demuxer_t *demuxer, struct block_info *block_info)
                 dp->pts = current_pts + i * track->default_duration;
             if (stream->codec->avi_dts)
                 MPSWAP(double, dp->pts, dp->dts);
-            if (i == 0)
+            if (i == 0 && block_info->duration_known)
                 dp->duration = block_duration / 1e9;
             if (stream->type == STREAM_AUDIO) {
                 unsigned int srate = stream->codec->samplerate;
@@ -2504,6 +2504,7 @@ static int read_block_group(demuxer_t *demuxer, int64_t end,
             if (block->duration == EBML_UINT_INVALID)
                 goto error;
             block->duration *= mkv_d->tc_scale;
+            block->duration_known = true;
             break;
 
         case MATROSKA_ID_DISCARDPADDING:
-- 
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