From 7da47f3f3cc8e178e93d2b95ed21c05ec90173e9 Mon Sep 17 00:00:00 2001
From: Holayn <kwwong1597@gmail.com>
Date: Sat, 23 Oct 2021 21:44:34 -0400
Subject: [PATCH] feat: video framerate option

---
 README.md           | 9 +++++++++
 lib/video/ffargs.js | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index d92a9f7..dd0c5e6 100644
--- a/README.md
+++ b/README.md
@@ -211,6 +211,15 @@ The default value is `none`
 opts = { video-hwaccel: 'vaapi' }
 ```
 
+##### Video FPS
+
+The default export video FPS is 25. You can specify an explicit FPS by adding a `framerate` option:
+
+```js
+opts = { framerate: 60 }
+opts = { framerate: 'preserve' }   // preserve the original source video's FPS
+```
+
 ##### Conversion progress
 
 The `.video()` call returns an [EventEmitter](https://nodejs.org/api/events.html)
diff --git a/lib/video/ffargs.js b/lib/video/ffargs.js
index 82a4c6c..97cc982 100644
--- a/lib/video/ffargs.js
+++ b/lib/video/ffargs.js
@@ -23,7 +23,9 @@ exports.prepare = function (source, target, options) {
   args.push('-i', source)
 
   // output framerate
-  args.push('-r', DEFAULT_VIDEO_FPS)
+  if (options.framerate !== 'preserve') {
+    args.push('-r', options.framerate || DEFAULT_VIDEO_FPS)
+  }
 
   // misc options
   args.push('-vsync', '2', '-movflags', '+faststart')