From 835f092ab44d45801c69bf680e89d2d724cca640 Mon Sep 17 00:00:00 2001
From: xufulong <839789740@qq.com>
Date: Sat, 23 May 2020 01:33:03 +0800
Subject: [PATCH] add cmd of changing video speed

add cmd of changing video speed
---
 app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
index dac8dc2..b0966c2 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
+++ b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
@@ -478,4 +478,12 @@ public class FFmpegUtil {
         return ffprobeCmd.split(" ");
     }
 
+    public static String[] changeSpeed(String inputFile, String outputFile, float speed) {
+        //audio atempo: 0.5--2
+        float ptsFactor = 1/speed;
+        String speedCmd = "ffmpeg -i %s -filter_complex [0:v]setpts=%.2f*PTS[v];[0:a]atempo=%.2f[a] -map [v] -map [a] %s";
+        speedCmd = String.format(Locale.getDefault(), speedCmd, inputFile, ptsFactor, speed, outputFile);
+        return speedCmd.split(" ");
+    }
+
 }