From 996bee7eb65d8f742a6b29a87bccfaaccb615668 Mon Sep 17 00:00:00 2001
From: David Howden <dhowden@gmail.com>
Date: Sat, 5 Mar 2016 16:17:11 +1100
Subject: [PATCH] Fix panic when picture isn't properly parsed.

See issue #19.
---
 mp4.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mp4.go b/mp4.go
index be31261..6b64014 100644
--- a/mp4.go
+++ b/mp4.go
@@ -310,5 +310,6 @@ func (m metadataMP4) Picture() *Picture {
 	if !ok {
 		return nil
 	}
-	return v.(*Picture)
+	p, _ := v.(*Picture)
+	return p
 }