commit 848f7656e1e912352345f84b9499ab4483902d3b
Author: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Date:   Sun Dec 27 18:37:28 2015 -0500

    track: Include missing header
    
    This is requried for av_rescale.
    
    Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

diff --git a/src/core/track.cpp b/src/core/track.cpp
index 3300094..136bc21 100644
--- a/src/core/track.cpp
+++ b/src/core/track.cpp
@@ -27,6 +27,7 @@
 
 #include <libavutil/avutil.h>
 #include <libavutil/common.h>
+#include <libavutil/mathematics.h>
 
 namespace {
 FrameInfo ReadFrame(ZipFile &stream, FrameInfo const& prev, const FFMS_TrackType TT) {