From 77cc60ab64a16e6cb4001a72bff82192f35b8f33 Mon Sep 17 00:00:00 2001
From: Mikael Finstad <finstaden@gmail.com>
Date: Fri, 24 Apr 2020 14:39:18 +0800
Subject: [PATCH] fix #14

---
 cli.js         | 9 ++++-----
 transitions.js | 4 ++--
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/cli.js b/cli.js
index cc71ff8..c0a105d 100644
--- a/cli.js
+++ b/cli.js
@@ -91,11 +91,10 @@ const cli = meow(`
 
   const { verbose, transitionName, transitionDuration, width, height, fps, audioFilePath, fontPath, fast, out: outPath } = cli.flags;
 
-  if (transitionName || transitionDuration) {
-    params.defaults.transition = {
-      name: transitionName,
-      duration: transitionDuration,
-    };
+  if (transitionName || transitionDuration != null) {
+    params.defaults.transition = {};
+    if (transitionName) params.defaults.transition.name = transitionName;
+    if (transitionDuration) params.defaults.transition.duration = transitionDuration;
   }
 
   if (fontPath) {
diff --git a/transitions.js b/transitions.js
index 26cdcf3..0adda68 100644
--- a/transitions.js
+++ b/transitions.js
@@ -38,8 +38,8 @@ function calcTransition(defaults, transition) {
 
   assert(!transitionOrDefault.duration || transitionOrDefault.name, 'Please specify transition name or set duration to 0');
 
-  if (transitionOrDefault.name === 'random') {
-    transitionOrDefault = { easing: transitionOrDefault.easing, name: getRandomTransition(), duration: 0.5 };
+  if (transitionOrDefault.name === 'random' && transitionOrDefault.duration) {
+    transitionOrDefault = { easing: transitionOrDefault.easing, name: getRandomTransition(), duration: transitionOrDefault.duration };
   }
 
   const getTransitionByAlias = () => {