https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/java/java37.jpg千金纵买相如赋,脉脉此情谁诉。
概述
有时候我们希望使用某一张图片作为视频素材的封面 ,而不是素材中的某帧。今天使用ffmpeg
批量替换视频素材封面。
环境装备
从官网下载安装 ffmpeg
准备素材
准备好视频素材和封面图片
编写程序
package cn.merryyou.file;
import java.io.*;
/**
* 修改视频封面
* Created by i@merryyou.cn on 2020/3/24
*
* @VERSION 1.0
*/
public class ChangeVedioCover {
public static final String FFMPEG_PATH = "D:/ffmpeg/bin/ffmpeg.exe"; // ffmpeg 程序迷路
public static final String FILE_PATH = "E:/BaiduNetdiskDownload/测试"; //需要替换封面的视频目录
public static final String IMAGE_PATH = "E:/BaiduNetdiskDownload/测试/1.png"; // 需要替换的封面照片
public static final String COMMAND = "%s -i %s -i %s -map 1 -map 0 -c copy -disposition:0 attached_pic -y %s"; // ffmpeg 替换封面的命令
public static void main(String[] args) throws Exception {
printPath(new File(FILE_PATH));
}
public static void printPath(File file) throws IOException {
File[] files = file.listFiles();
for (File a : files) {
System.out.println(a.getAbsolutePath());
if (a.getAbsolutePath().endsWith(".mp4")) {
String newPath = a.getParent() + "/" + a.getName().substring(0, a.getName().lastIndexOf(".")) + "_.mp4"; // 新生成的文件名后面添加_ 下划线
String cmd = String.format(COMMAND, FFMPEG_PATH, a.getAbsolutePath(), IMAGE_PATH, newPath);
execCmd(cmd);
a.delete();// 删除源文件
}
if (a.isDirectory()) {
printPath(a);
}
}
}
public static void execCmd(String cmd) {
ProcessBuilder builder = new ProcessBuilder("cmd.exe", "/C", cmd);
Process process = null;
try {
process = builder.redirectErrorStream(true).start();
} catch (IOException e) {
e.printStackTrace();
}
InputStream in = process.getInputStream();
outStream(in);
}
private static void outStream(InputStream in) {
// 用一个读输出流类去读
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String line;
// 逐行读取输出到控制台
try {
while ((line = br.readLine()) != null) {
// System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
效果如下
修改封面前
https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/java/java38.png修改封面后
https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/java/java39.png总结
更多ffmpeg
命令参考链接
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