From 5ba51d9b8242653f360045b33163040dc4fd9722 Mon Sep 17 00:00:00 2001
From: xufulong <839789740@qq.com>
Date: Sat, 26 Sep 2020 12:33:15 +0800
Subject: [PATCH] extract video frames with scale

extract video frames with scale
---
 .../ffmpeg/activity/VideoHandleActivity.java   |  4 ++--
 .../java/com/frank/ffmpeg/util/FFmpegUtil.java | 18 +++++++++++++-----
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
index 031e588..49bf0a4 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
+++ b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
@@ -264,9 +264,9 @@ public class VideoHandleActivity extends BaseActivity {
                     }
                 }
                 int mStartTime = 10;//start time
-                int mDuration = 20;//duration
+                int mDuration = 5;//duration
                 int mFrameRate = 10;//frameRate
-                commandLine = FFmpegUtil.videoToImage(srcFile, mStartTime, mDuration, mFrameRate, imagePath);
+                commandLine = FFmpegUtil.videoToImageWithScale(srcFile, mStartTime, mDuration, mFrameRate, 320, imagePath);
                 break;
             case R.id.btn_pip://combine into picture-in-picture video
                 String inputFile1 = PATH + File.separator + "beyond.mp4";
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 70b3341..eda5a92 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
+++ b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
@@ -427,11 +427,19 @@ public class FFmpegUtil {
      * @return convert success or not
      */
     public static String[] videoToImage(String inputFile, int startTime, int duration, int frameRate, String targetFile) {
-        //-ss：start time
-        //-t：duration
-        //-r：frame rate
-        String toImage = "ffmpeg -i %s -ss %s -t %s -r %s %s";
-        toImage = String.format(Locale.CHINESE, toImage, inputFile, startTime, duration, frameRate, targetFile);
+        return videoToImageWithScale(inputFile, startTime, duration, frameRate, 0, targetFile);
+    }
+
+    public static String[] videoToImageWithScale(String inputFile, int startTime, int duration,
+                                                 int frameRate, int width, String targetFile) {
+        String toImage;
+        if (width > 0) {
+            toImage = "ffmpeg -i %s -ss %d -t %d -an -vf fps=%d,scale=%d:-1 %s";
+            toImage = String.format(Locale.CHINESE, toImage, inputFile, startTime, duration, frameRate, width, targetFile);
+        } else {
+            toImage = "ffmpeg -i %s -ss %d -t %d -an -r %d %s";
+            toImage = String.format(Locale.CHINESE, toImage, inputFile, startTime, duration, frameRate, targetFile);
+        }
         toImage = toImage + "%3d.jpg";
         return toImage.split(" ");
     }