From 262e472f0eb4904998f54a9f99d12d47f5837689 Mon Sep 17 00:00:00 2001
From: xufulong <839789740@qq.com>
Date: Sun, 20 Sep 2020 14:25:47 +0800
Subject: [PATCH] convert gif with palette

convert gif with palette
---
 .../ffmpeg/activity/VideoHandleActivity.java  | 15 +++++---
 .../com/frank/ffmpeg/util/FFmpegUtil.java     | 35 ++++++++++++++-----
 2 files changed, 37 insertions(+), 13 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 ef8be14..3fde110 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
+++ b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
@@ -223,11 +223,18 @@ public class VideoHandleActivity extends BaseActivity {
             case R.id.btn_generate_gif://convert video into gif
                 String Video2Gif = PATH + File.separator + "Video2Gif.gif";
                 int gifStart = 30;
-                int gifDuration = 5;
-                String resolution = "720x1280";//240x320、480x640、1080x1920
+                int gifDuration = 10;
+                int width = 320;
                 int frameRate = 10;
-                commandLine = FFmpegUtil.generateGif(srcFile, gifStart, gifDuration,
-                        resolution, frameRate, Video2Gif);
+                String palettePath = PATH + "/palette.png";
+                FileUtil.deleteFile(palettePath);
+                String[] paletteCmd = FFmpegUtil.generatePalette(srcFile, frameRate, width, palettePath);
+                String[] gifCmd = FFmpegUtil.generateGifByPalette(srcFile, palettePath, gifStart, gifDuration,
+                        frameRate, width, Video2Gif);
+                List<String[]> cmdList = new ArrayList<>();
+                cmdList.add(paletteCmd);
+                cmdList.add(gifCmd);
+                ffmpegHandler.executeFFmpegCmds(cmdList);
                 break;
             case R.id.btn_screen_record://screen recording
 //                String screenRecord = PATH + File.separator + "screenRecord.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 f53ea98..f36d3c0 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
+++ b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
@@ -284,22 +284,39 @@ public class FFmpegUtil {
     }
 
     /**
-     * convert video into gif
+     * generate a palette for gif
      *
      * @param srcFile    input file
+     * @param frameRate  frameRate of the gif
+     * @param width      width
+     * @param targetFile output file
+     * @return generate palette success or not
+     */
+    public static String[] generatePalette(String srcFile, int frameRate, int width, String targetFile) {
+        String paletteCmd = "ffmpeg -i %s -vf fps=%d,scale=%d:-1:flags=lanczos,palettegen %s";
+        paletteCmd = String.format(Locale.getDefault(), paletteCmd, srcFile, frameRate, width, targetFile);
+        return paletteCmd.split(" ");
+    }
+
+    /**
+     * convert video into gif with palette
+     *
+     * @param srcFile    input file
+     * @param palette    the palette which will apply to gif
      * @param startTime  startTime in the video
      * @param duration   duration, how long you want to
-     * @param targetFile output file
-     * @param resolution resolution of the gif
      * @param frameRate  frameRate of the gif
+     * @param width      width
+     * @param targetFile output gif
      * @return convert gif success or not
      */
-    public static String[] generateGif(String srcFile, int startTime, int duration,
-                                       String resolution, int frameRate, String targetFile) {
-        String generateGifCmd = "ffmpeg -i %s -ss %d -t %d -s %s -r %d -f gif %s";
-        generateGifCmd = String.format(Locale.getDefault(), generateGifCmd, srcFile, startTime, duration,
-                resolution, frameRate, targetFile);
-        return generateGifCmd.split(" ");
+    public static String[] generateGifByPalette(String srcFile, String palette, int startTime, int duration,
+                                           int frameRate, int width, String targetFile) {
+        String paletteGifCmd = "ffmpeg -i %s -i %s -ss %d -t %d -lavfi fps=%d,scale=%d:-1:flags=lanczos[x];[x][1:v]" +
+                "paletteuse=dither=bayer:bayer_scale=3 %s";
+        paletteGifCmd = String.format(Locale.getDefault(), paletteGifCmd, srcFile, palette, startTime,
+                duration, frameRate, width, targetFile);
+        return paletteGifCmd.split(" ");
     }
 
     /**